Publications


Suppression of ψ(2S) production in p-Pb collisions at √sNN = 5.02 TeV

Journal of High Energy Physics 2014 (2014)

The ALICE collaboration, B Abelev, J Adam, D Adamová, MM Aggarwal, M Agnello, A Agostinelli, N Agrawal, Z Ahammed, N Ahmad, I Ahmed, SU Ahn, SA Ahn, I Aimo, S Aiola, M Ajaz, A Akindinov, SN Alam, D Aleksandrov, B Alessandro, D Alexandre, A Alici, A Alkin, J Alme, T Alt, S Altinpinar, I Altsybeev, C Alves Garcia Prado, C Andrei, A Andronic, V Anguelov, J Anielski, T Antičić, F Antinori, P Antonioli, L Aphecetche, H Appelshäuser, S Arcelli, N Armesto, R Arnaldi, T Aronsson, IC Arsene, M Arslandok, A Augustinus, R Averbeck, TC Awes, MD Azmi, M Bach, A Badalà, YW Baek, S Bagnasco, R Bailhache, R Bala, A Baldisseri, F Baltasar Dos Santos Pedrosa, RC Baral, R Barbera, F Barile, GG Barnaföldi, LS Barnby, V Barret, J Bartke, M Basile, N Bastid, S Basu, B Bathen, G Batigne, A Batista Camejo, B Batyunya, PC Batzing, C Baumann, IG Bearden, H Beck, C Bedda, NK Behera, I Belikov, F Bellini, R Bellwied, E Belmont-Moreno, R Belmont, V Belyaev, G Bencedi, S Beole, I Berceanu, A Bercuci, Y Berdnikov, D Berenyi, ME Berger, RA Bertens, D Berzano, L Betev, A Bhasin, IR Bhat, AK Bhati, B Bhattacharjee, J Bhom, L Bianchi, N Bianchi, C Bianchin, J Bielčík

© 2014, The Author(s). Abstract: The ALICE Collaboration has studied the inclusive production of the charmonium state ψ(2S) in proton-lead (p-Pb) collisions at the nucleon-nucleon centre of mass energy (formula presented.) = 5.02 TeV at the CERN LHC. The measurement was performed at forward (2.03 < ycms< 3.53) and backward (−4.46 < ycms< −2.96) centre of mass rapidities, studying the decays into muon pairs. In this paper, we present the inclusive production cross sections σψ(2S), both integrated and as a function of the transverse momentum pT, for the two ycms domains. The results are compared to those obtained for the 1S vector state (J/ψ), by showing the ratios between the production cross sections, as well as the double ratios [σψ(2S)/σJ/ψ ]pPb/[σψ(2S)/σJ/ψ]pp between p-Pb and proton-proton collisions. Finally, the nuclear modification factor for inclusive ψ(2S) is evaluated and compared to the measurement of the same quantity for J/ψ and to theoretical models including parton shadowing and coherent energy loss mechanisms. The results show a significantly larger suppression of the ψ(2S) compared to that measured for J/ψ and to models. These observations represent a clear indication for sizeable final state effects on ψ(2S) production.[Figure not available: see fulltext.


BICEP2 and Keck array: Upgrades and improved beam characterization

Proceedings of SPIE - The International Society for Optical Engineering 9153 (2014)

I Buder, PAR Ade, Z Ahmed, RW Aikin, KD Alexander, M Amiri, D Barkats, SJ Benton, CA Bischoff, JJ Bock, JA Bonetti, JA Brevik, E Bullock, B Burger, BP Crill, G Davis, CD Dowell, L Duband, JP Filippini, S Fliescher, SR Golwala, MS Gordon, M Halpern, M Hasselfield, SR Hildebrandt, GC Hilton, VV Hristov, H Hui, KD Irwin, KS Karkare, JP Kaufman, BG Keating, S Kefeli, SA Kernasovskiy, JM Kovac, CL Kuo, EM Leitch, M Lueker, P Mason, KG Megerian, CB Netterfield, HT Nguyen, R O'Brient, RW Ogburn, A Orlando, C Pryke, CD Reintsema, S Richter, R Schwarz, CD Sheehy, ZK Staniszewski, RV Sudiwala, GP Teply, KL Thompson, JE Tolan, AD Turner, AG Vieregg, AC Weber, DV Wiebe, P Wilson, CL Wong, KW Yoon

© 2014 SPIE. Searching for evidence of inflation by measuring B-modes in the cosmic microwave background (CMB) polarization at degree angular scales remains one of the most compelling experimental challenges in cosmology. BICEP2 and the Keck Array are part of a program of experiments at the South Pole whose main goal is to achieve the sensitivity and systematic control necessary for measurements of the tensor-to-scalar ratio at σ(r) ∼0:01. Beam imperfections that are not sufficiently accounted for are a potential source of spurious polarization that could interfere with that goal. The strategy of BICEP2 and the Keck Array is to completely characterize their telescopes' polarized beam response with a combination of in-lab, pre-deployment, and on-site calibrations. We Sereport the status of these experiments, focusing on continued improved understanding of their beams. Far-field measurements of the BICEP2 beam with a chopped thermal source, combined with analysis improvements, show that the level of residual beam-induced systematic errors is acceptable for the goal of σ(r) ∼ 0:01 measurements. Beam measurements of the Keck Array side lobes helped identify a way to reduce optical loading with interior cold baffles, which we installed in late 2013. These baffles reduced total optical loading, leading to a ∼ 10% increase in mapping speed for the 2014 observing season. The sensitivity of the Keck Array continues to improve: for the 2013 season it was 9:5 μ 1/4K s noise equivalent temperature (NET). In 2014 we converted two of the 150-GHz cameras to 100 GHz for foreground separation capability. We have shown that the BICEP2 and the Keck Array telescope technology is sufficient for the goal of σ(r) ∼ 0:01 measurements. Furthermore, the program is continuing with BICEP3, a 100-GHz telescope with 2560 detectors.


Keck array and BICEP3: Spectral characterization of 5000+ detectors

Proceedings of SPIE - The International Society for Optical Engineering 9153 (2014)

KS Karkare, PAR Ade, Z Ahmed, RW Aikin, KD Alexander, M Amiri, D Barkats, SJ Benton, CA Bischoff, JJ Bock, JA Bonetti, JA Brevik, I Buder, EW Bullock, B Burger, J Connors, BP Crill, G Davis, CD Dowell, L Duband, JP Filippini, ST Fliescher, SR Golwala, MS Gordon, JA Grayson, M Halpern, M Hasselfield, SR Hildebrandt, GC Hilton, VV Hristov, H Hui, KD Irwin, JH Kang, E Karpel, S Kefeli, SA Kernasovskiy, JM Kovac, CL Kuo, EM Leitch, M Lueker, P Mason, KG Megerian, CB Netterfield, HT Nguyen, R O'Brient, RW Ogburn, CL Pryke, CD Reintsema, S Richter, R Schwarz, CD Sheehy, ZK Staniszewski, RV Sudiwala, GP Teply, KL Thompson, JE Tolan, AD Turner, A Vieregg, A Weber, CL Wong, WLK Wu, KW Yoon

© 2014 SPIE. The inflationary paradigm of the early universe predicts a stochastic background of gravitational waves which would generate a B-mode polarization pattern in the cosmic microwave background (CMB) at degree angular scales. Precise measurement of B-modes is one of the most compelling observational goals in modern cosmology. Since 2011, the Keck Array has deployed over 2500 transition edge sensor (TES) bolometer detectors at 100 and 150 GHz to the South Pole in pursuit of degree-scale B-modes, and Bicep3 will follow in 2015 with 2500 more at 100 GHz. Characterizing the spectral response of these detectors is important for controlling systematic effects that could lead to leakage from the temperature to polarization signal, and for understanding potential coupling to atmospheric and astrophysical emission lines. We present complete spectral characterization of the Keck Array detectors, made with a Martin-Puplett Fourier Transform Spectrometer at the South Pole, and preliminary spectra of Bicep3 detectors taken in lab. We show band centers and effective bandwidths for both Keck Array bands, and use models of the atmosphere at the South Pole to cross check our absolute calibration. Our procedure for obtaining interferograms in the field with automated 4-axis coupling to the focal plane represents an important step towards efficient and complete spectral characterization of next-generation instruments more than 10000 detectors.


Measurement of quarkonium production at forward rapidity in [Formula: see text] collisions at [Formula: see text]TeV.

The European physical journal. C, Particles and fields 74 (2014) 2974-

ALICE Collaboration, B Abelev, J Adam, D Adamová, MM Aggarwal, M Agnello, A Agostinelli, N Agrawal, Z Ahammed, N Ahmad, A Ahmad Masoodi, I Ahmed, SU Ahn, SA Ahn, I Aimo, S Aiola, M Ajaz, A Akindinov, D Aleksandrov, B Alessandro, D Alexandre, A Alici, A Alkin, J Alme, T Alt, V Altini, S Altinpinar, I Altsybeev, C Alves Garcia Prado, C Andrei, A Andronic, V Anguelov, J Anielski, T Antičić, F Antinori, P Antonioli, L Aphecetche, H Appelshäuser, N Arbor, S Arcelli, N Armesto, R Arnaldi, T Aronsson, IC Arsene, M Arslandok, A Augustinus, R Averbeck, TC Awes, MD Azmi, M Bach, A Badalà, YW Baek, S Bagnasco, R Bailhache, R Bala, A Baldisseri, F Baltasar Dos Santos Pedrosa, RC Baral, R Barbera, F Barile, GG Barnaföldi, LS Barnby, V Barret, J Bartke, M Basile, N Bastid, S Basu, B Bathen, G Batigne, B Batyunya, PC Batzing, C Baumann, IG Bearden, H Beck, C Bedda, NK Behera, I Belikov, F Bellini, R Bellwied, E Belmont-Moreno, G Bencedi, S Beole, I Berceanu, A Bercuci, Y Berdnikov, D Berenyi, RA Bertens, D Berzano, L Betev, A Bhasin, IR Bhat, AK Bhati, B Bhattacharjee, J Bhom, L Bianchi, N Bianchi, C Bianchin, J Bielčík, J Bielčíková, A Bilandzic, S Bjelogrlic, F Blanco, D Blau, C Blume, F Bock, A Bogdanov, H Bøggild, M Bogolyubsky, L Boldizsár, M Bombara, J Book, H Borel, A Borissov, F Bossú, M Botje, E Botta, S Böttger, P Braun-Munzinger, M Bregant, T Breitner, TA Broker, TA Browning, M Broz, E Bruna, GE Bruno, D Budnikov, H Buesching, S Bufalino, P Buncic, O Busch, Z Buthelezi, D Caffarri, X Cai, H Caines, A Caliva, E Calvo Villar, P Camerini, F Carena, W Carena, J Castillo Castellanos, EAR Casula, V Catanescu, C Cavicchioli, C Ceballos Sanchez, J Cepila, P Cerello, B Chang, S Chapeland, JL Charvet, S Chattopadhyay, S Chattopadhyay, V Chelnokov, M Cherney, C Cheshkov, B Cheynis, V Chibante Barroso, DD Chinellato, P Chochula, M Chojnacki, S Choudhury, P Christakoglou, CH Christensen, P Christiansen, T Chujo, SU Chung, C Cicalo, L Cifarelli, F Cindolo, J Cleymans, F Colamaria, D Colella, A Collu, M Colocci, G Conesa Balbastre, Z Conesa Del Valle, ME Connors, JG Contreras, TM Cormier, Y Corrales Morales, P Cortese, I Cortés Maldonado, MR Cosentino, F Costa, P Crochet, R Cruz Albino, E Cuautle, L Cunqueiro, A Dainese, R Dang, A Danu, D Das, I Das, K Das, S Das, A Dash, S Dash, S De, H Delagrange, A Deloff, E Dénes, G D'Erasmo, A De Caro, G de Cataldo, J de Cuveland, A De Falco, D De Gruttola, N De Marco, S De Pasquale, R de Rooij, MA Diaz Corchero, T Dietel, R Divià, D Di Bari, S Di Liberto, A Di Mauro, P Di Nezza, Ø Djuvsland, A Dobrin, T Dobrowolski, D Domenicis Gimenez, B Dönigus, O Dordic, AK Dubey, A Dubla, L Ducroux, P Dupieux, AK Dutta Majumdar, RJ Ehlers, D Elia, H Engel, B Erazmus, HA Erdal, D Eschweiler, B Espagnon, M Esposito, M Estienne, S Esumi, D Evans, S Evdokimov, D Fabris, J Faivre, D Falchieri, A Fantoni, M Fasel, D Fehlker, L Feldkamp, D Felea, A Feliciello, G Feofilov, J Ferencei, A Fernández Téllez, A Fernández Téllez, EG Ferreiro, A Ferretti, A Festanti, J Figiel, MAS Figueredo, S Filchagin, D Finogeev, FM Fionda, EM Fiore, E Floratos, M Floris, S Foertsch, P Foka, S Fokin, E Fragiacomo, A Francescon, U Frankenfeld, U Fuchs, C Furget, M Fusco Girard, JJ Gaardhøje, M Gagliardi, AM Gago, M Gallio, DR Gangadharan, P Ganoti, C Garabatos, E Garcia-Solis, C Gargiulo, I Garishvili, J Gerhard, M Germain, A Gheata, M Gheata, B Ghidini, P Ghosh, SK Ghosh, P Gianotti, P Giubellino, E Gladysz-Dziadus, P Glässel, A Gomez Ramirez, P González-Zamora, S Gorbunov, L Görlich, S Gotovac, LK Graczykowski, A Grelli, A Grigoras, C Grigoras, V Grigoriev, A Grigoryan, S Grigoryan, B Grinyov, N Grion, JF Grosse-Oetringhaus, J-Y Grossiord, R Grosso, F Guber, R Guernane, B Guerzoni, M Guilbaud, K Gulbrandsen, H Gulkanyan, T Gunji, A Gupta, R Gupta, KH Khan, R Haake, Ø Haaland, C Hadjidakis, M Haiduc, H Hamagaki, G Hamar, LD Hanratty, A Hansen, JW Harris, H Hartmann, A Harton, D Hatzifotiadou, S Hayashi, ST Heckel, M Heide, H Helstrup, A Herghelegiu, G Herrera Corral, BA Hess, KF Hetland, B Hicks, B Hippolyte, J Hladky, P Hristov, M Huang, TJ Humanic, D Hutter, DS Hwang, R Ilkaev, I Ilkiv, M Inaba, GM Innocenti, C Ionita, M Ippolitov, M Irfan, M Ivanov, V Ivanov, O Ivanytskyi, A Jachołkowski, PM Jacobs, C Jahnke, HJ Jang, MA Janik, PHSY Jayarathna, S Jena, S Jena, RT Jimenez Bustamante, PG Jones, H Jung, A Jusko, V Kadyshevskiy, S Kalcher, P Kalinak, A Kalweit, J Kamin, JH Kang, V Kaplin, S Kar, A Karasu Uysal, O Karavichev, T Karavicheva, E Karpechev, U Kebschull, R Keidel, MM Khan, P Khan, SA Khan, A Khanzadeev, Y Kharlov, B Kileng, B Kim, DW Kim, DJ Kim, JS Kim, M Kim, M Kim, S Kim, T Kim, S Kirsch, I Kisel, S Kiselev, A Kisiel, G Kiss, JL Klay, J Klein, C Klein-Bösing, A Kluge, ML Knichel, AG Knospe, C Kobdaj, MK Köhler, T Kollegger, A Kolojvari, V Kondratiev, N Kondratyeva, A Konevskikh, V Kovalenko, M Kowalski, S Kox, G Koyithatta Meethaleveedu, J Kral, I Králik, F Kramer, A Kravčáková, M Krelina, M Kretz, M Krivda, F Krizek, M Krus, E Kryshen, M Krzewicki, V Kučera, Y Kucheriaev, T Kugathasan, C Kuhn, PG Kuijer, I Kulakov, J Kumar, P Kurashvili, A Kurepin, AB Kurepin, A Kuryakin, S Kushpil, MJ Kweon, Y Kwon, P Ladron de Guevara, C Lagana Fernandes, I Lakomov, R Langoy, C Lara, A Lardeux, A Lattuca, SL La Pointe, P La Rocca, R Lea, GR Lee, I Legrand, J Lehnert, RC Lemmon, V Lenti, E Leogrande, M Leoncino, I León Monzón, P Lévai, S Li, J Lien, R Lietava, S Lindal, V Lindenstruth, C Lippmann, MA Lisa, HM Ljunggren, DF Lodato, PI Loenne, VR Loggins, V Loginov, D Lohner, C Loizides, X Lopez, E López Torres, X-G Lu, P Luettig, M Lunardon, J Luo, G Luparello, C Luzzi, R Ma, A Maevskaya, M Mager, DP Mahapatra, A Maire, RD Majka, M Malaev, I Maldonado Cervantes, L Malinina, D Mal'Kevich, P Malzacher, A Mamonov, L Manceau, V Manko, F Manso, V Manzari, M Marchisone, J Mareš, GV Margagliotti, A Margotti, A Marín, C Markert, M Marquard, I Martashvili, NA Martin, P Martinengo, MI Martínez, G Martínez García, J Martin Blanco, Y Martynov, A Mas, S Masciocchi, M Masera, A Masoni, L Massacrier, A Mastroserio, A Matyja, C Mayer, J Mazer, MA Mazzoni, F Meddi, A Menchaca-Rocha, J Mercado Pérez, M Meres, Y Miake, K Mikhaylov, L Milano, J Milosevic, A Mischke, AN Mishra, D Miśkowiec, CM Mitu, J Mlynarz, B Mohanty, L Molnar, L Montaño Zetina, E Montes, M Morando, DA Moreira De Godoy, S Moretto, A Morreale, A Morsch, V Muccifora, E Mudnic, S Muhuri, M Mukherjee, H Müller, MG Munhoz, S Murray, L Musa, J Musinsky, BK Nandi, R Nania, E Nappi, C Nattrass, TK Nayak, S Nazarenko, A Nedosekin, M Nicassio, M Niculescu, BS Nielsen, S Nikolaev, S Nikulin, V Nikulin, BS Nilsen, F Noferini, P Nomokonov, G Nooren, A Nyanin, J Nystrand, H Oeschler, S Oh, SK Oh, A Okatan, L Olah, J Oleniacz, AC Oliveira Da Silva, J Onderwaater, C Oppedisano, A Ortiz Velasquez, A Oskarsson, J Otwinowski, K Oyama, P Sahoo, Y Pachmayer, M Pachr, P Pagano, G Paić, F Painke, C Pajares, SK Pal, A Palmeri, D Pant, V Papikyan, GS Pappalardo, P Pareek, WJ Park, S Parmar, A Passfeld, DI Patalakha, V Paticchio, B Paul, T Pawlak, T Peitzmann, H Pereira Da Costa, E Pereira De Oliveira Filho, D Peresunko, CE Pérez Lara, A Pesci, V Peskov, Y Pestov, V Petráček, M Petran, M Petris, M Petrovici, C Petta, S Piano, M Pikna, P Pillot, O Pinazza, L Pinsky, DB Piyarathna, M Płoskoń, M Planinic, J Pluta, S Pochybova, PLM Podesta-Lerma, MG Poghosyan, EHO Pohjoisaho, B Polichtchouk, N Poljak, A Pop, S Porteboeuf-Houssais, J Porter, V Pospisil, B Potukuchi, SK Prasad, R Preghenella, F Prino, CA Pruneau, I Pshenichnov, G Puddu, P Pujahari, V Punin, J Putschke, H Qvigstad, A Rachevski, S Raha, J Rak, A Rakotozafindrabe, L Ramello, R Raniwala, S Raniwala, SS Räsänen, BT Rascanu, D Rathee, AW Rauf, V Razazi, KF Read, JS Real, K Redlich, RJ Reed, A Rehman, P Reichelt, M Reicher, F Reidt, R Renfordt, AR Reolon, A Reshetin, F Rettig, J-P Revol, K Reygers, RA Ricci, T Richert, M Richter, P Riedler, W Riegler, F Riggi, A Rivetti, E Rocco, M Rodríguez Cahuantzi, A Rodriguez Manso, K Røed, E Rogochaya, S Rohni, D Rohr, D Röhrich, R Romita, F Ronchetti, P Rosnet, S Rossegger, A Rossi, F Roukoutakis, A Roy, C Roy, P Roy, AJ Rubio Montero, R Rui, R Russo, E Ryabinkin, A Rybicki, S Sadovsky, K Šafařík, B Sahlmuller, R Sahoo, PK Sahu, J Saini, CA Salgado, J Salzwedel, S Sambyal, V Samsonov, X Sanchez Castro, FJ Sánchez Rodríguez, L Šándor, A Sandoval, M Sano, G Santagati, D Sarkar, E Scapparone, F Scarlassara, RP Scharenberg, C Schiaua, R Schicker, C Schmidt, HR Schmidt, S Schuchmann, J Schukraft, M Schulc, T Schuster, Y Schutz, K Schwarz, K Schweda, G Scioli, E Scomparin, R Scott, G Segato, JE Seger, Y Sekiguchi, I Selyuzhenkov, J Seo, E Serradilla, A Sevcenco, A Shabetai, G Shabratova, R Shahoyan, A Shangaraev, N Sharma, S Sharma, K Shigaki, K Shtejer, Y Sibiriak, S Siddhanta, T Siemiarczuk, D Silvermyr, C Silvestre, G Simatovic, R Singaraju, R Singh, S Singha, V Singhal, BC Sinha, T Sinha, B Sitar, M Sitta, TB Skaali, K Skjerdal, R Smakal, N Smirnov, RJM Snellings, C Søgaard, R Soltz, J Song, M Song, F Soramel, S Sorensen, M Spacek, I Sputowska, M Spyropoulou-Stassinaki, BK Srivastava, J Stachel, I Stan, G Stefanek, M Steinpreis, E Stenlund, G Steyn, JH Stiller, D Stocco, M Stolpovskiy, P Strmen, AAP Suaide, T Sugitate, C Suire, M Suleymanov, R Sultanov, M Šumbera, T Susa, TJM Symons, A Szanto de Toledo, I Szarka, A Szczepankiewicz, M Szymanski, J Takahashi, MA Tangaro, JD Tapia Takaki, A Tarantola Peloni, A Tarazona Martinez, A Tauro, G Tejeda Muñoz, A Telesca, C Terrevoli, J Thäder, D Thomas, R Tieulent, AR Timmins, A Toia, H Torii, V Trubnikov, WH Trzaska, T Tsuji, A Tumkin, R Turrisi, TS Tveter, J Ulery, K Ullaland, A Uras, GL Usai, M Vajzer, M Vala, L Valencia Palomo, S Vallero, P Vande Vyvre, L Vannucci, JW Van Hoorne, M van Leeuwen, A Vargas, R Varma, M Vasileiou, A Vasiliev, V Vechernin, M Veldhoen, A Velure, M Venaruzzo, E Vercellin, S Vergara Limón, R Vernet, M Verweij, L Vickovic, G Viesti, J Viinikainen, Z Vilakazi, O Villalobos Baillie, A Vinogradov, L Vinogradov, Y Vinogradov, T Virgili, YP Viyogi, A Vodopyanov, MA Völkl, K Voloshin, SA Voloshin, G Volpe, B von Haller, I Vorobyev, D Vranic, J Vrláková, B Vulpescu, A Vyushin, B Wagner, J Wagner, V Wagner, M Wang, Y Wang, D Watanabe, M Weber, JP Wessels, U Westerhoff, J Wiechula, J Wikne, M Wilde, G Wilk, J Wilkinson, MCS Williams, B Windelband, M Winn, C Xiang, CG Yaldo, Y Yamaguchi, H Yang, P Yang, S Yang, S Yano, S Yasnopolskiy, J Yi, Z Yin, I-K Yoo, I Yushmanov, V Zaccolo, C Zach, A Zaman, C Zampolli, S Zaporozhets, A Zarochentsev, P Závada, N Zaviyalov, H Zbroszczyk, IS Zgura, M Zhalov, H Zhang, X Zhang, Y Zhang, C Zhao, N Zhigareva, D Zhou, F Zhou, Y Zhou, H Zhu, J Zhu, X Zhu, A Zichichi, A Zimmermann, MB Zimmermann, G Zinovjev, Y Zoccarato, M Zynovyev, M Zyzak

The inclusive production cross sections at forward rapidity of [Formula: see text], [Formula: see text], [Formula: see text](1S) and [Formula: see text](2S) are measured in [Formula: see text] collisions at [Formula: see text] with the ALICE detector at the LHC. The analysis is based on a data sample corresponding to an integrated luminosity of 1.35 pb[Formula: see text]. Quarkonia are reconstructed in the dimuon-decay channel and the signal yields are evaluated by fitting the [Formula: see text] invariant mass distributions. The differential production cross sections are measured as a function of the transverse momentum [Formula: see text] and rapidity [Formula: see text], over the ranges [Formula: see text] GeV/c for [Formula: see text], [Formula: see text] GeV/c for all other resonances and for [Formula: see text]. The measured cross sections integrated over [Formula: see text] and [Formula: see text], and assuming unpolarized quarkonia, are: [Formula: see text] [Formula: see text]b, [Formula: see text] [Formula: see text]b, [Formula: see text] nb and [Formula: see text] nb, where the first uncertainty is statistical and the second one is systematic. The results are compared to measurements performed by other LHC experiments and to theoretical models.


Centrality, rapidity and transverse momentum dependence of J/ψ suppression in Pb-Pb collisions at √s<inf>NN</inf>= 2.76TeV

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 734 (2014) 314-327

B Abelev, J Adam, D Adamová, MM Aggarwal, G Aglieri Rinella, M Agnello, AG Agocs, A Agostinelli, N Agrawal, Z Ahammed, N Ahmad, A Ahmad Masoodi, I Ahmed, SU Ahn, SA Ahn, I Aimo, S Aiola, M Ajaz, A Akindinov, D Aleksandrov, B Alessandro, D Alexandre, A Alici, A Alkin, J Alme, T Alt, V Altini, S Altinpinar, I Altsybeev, C Alves Garcia Prado, C Andrei, A Andronic, V Anguelov, J Anielski, T Antičić, F Antinori, P Antonioli, L Aphecetche, H Appelshäuser, N Arbor, S Arcelli, N Armesto, R Arnaldi, T Aronsson, IC Arsene, M Arslandok, A Augustinus, R Averbeck, TC Awes, MD Azmi, M Bach, A Badalà, YW Baek, S Bagnasco, R Bailhache, V Bairathi, R Bala, A Baldisseri, F Baltasar Dos Santos Pedrosa, J Bán, RC Baral, R Barbera, F Barile, GG Barnaföldi, LS Barnby, V Barret, J Bartke, M Basile, N Bastid, S Basu, B Bathen, G Batigne, B Batyunya, PC Batzing, C Baumann, IG Bearden, H Beck, C Bedda, NK Behera, I Belikov, F Bellini, R Bellwied, E Belmont-Moreno, G Bencedi, S Beole, I Berceanu, A Bercuci, Y Berdnikov, D Berenyi, ME Berger, AAE Bergognon, RA Bertens, D Berzano, L Betev, A Bhasin, AK Bhati, B Bhattacharjee, J Bhom, L Bianchi, N Bianchi

The inclusive J/ψ nuclear modification factor (RAA) in Pb-Pb collisions at √sNN=2.76TeV has been measured by ALICE as a function of centrality in the e +e - decay channel at mid-rapidity (|y| < 0.8) and as a function of centrality, transverse momentum and rapidity in the μ +μ - decay channel at forward-rapidity (2.5 < y < 4). The J/ψ yields measured in Pb-Pb are suppressed compared to those in pp collisions scaled by the number of binary collisions. The RAA integrated over a centrality range corresponding to 90% of the inelastic Pb-Pb cross section is 0.72 ± 0.06(stat.) ± 0.10(syst.) at mid-rapidity and 0.58 ± 0.01(stat.) ± 0.09(syst.) at forward-rapidity. At low transverse momentum, significantly larger values of RAA are measured at forward-rapidity compared to measurements at lower energy. These features suggest that a contribution to the J/ψ yield originates from charm quark (re)combination in the deconfined partonic medium. © 2014 The Authors.


The mass-hierarchy and CP-violation discovery reach of the LBNO long-baseline neutrino experiment

JOURNAL OF HIGH ENERGY PHYSICS (2014) ARTN 094

SK Agarwalla, L Agostino, M Aittola, A Alekou, B Andrieu, D Angus, F Antoniou, A Ariga, T Ariga, R Asfandiyarov, D Autiero, P Ballett, I Bandac, D Banerjee, GJ Barker, G Barr, W Bartmann, F Bay, V Berardi, I Bertram, O Besida, AM Blebea-Apostu, A Blondel, M Bogomilov, E Borriello, S Boyd, I Brancus, A Bravar, M Buizza-Avanzini, F Cafagna, M Calin, M Calviani, M Campanelli, C Cantini, O Caretta, G Cata-Danil, MG Catanesi, A Cervera, S Chakraborty, L Chaussard, D Chesneanu, F Chipesiu, G Christodoulou, J Coleman, P Crivelli, T Davenne, J Dawson, I De Bonis, J De Jong, Y Declais, PDA Sanchez, A Delbart, C Densham, F Di Lodovico, S Di Luise, D Duchesneau, J Dumarchez, I Efthymiopoulos, A Eliseev, S Emery, K Enqvist, T Enqvist, L Epprecht, A Ereditato, AN Erykalov, T Esanu, AJ Finch, MD Fitton, D Franco, V Galymov, G Gavrilov, A Gendotti, C Giganti, B Goddard, JJ Gomez, CM Gomoiu, YA Gornushkin, P Gorodetzky, N Grant, A Haesler, MD Haigh, T Hasegawa, S Haug, M Hierholzer, J Hissa, S Horikawa, K Huitu, J Ilic, AN Ioannisian, A Izmaylov, A Jipa, K Kainulainen, T Kalliokoski, Y Karadzhov, J Kawada, M Khabibullin, A Khotjantsev, E Kokko, AN Kopylov, LL Kormos, A Korzenev, S Kosyanenko, I Kreslo, D Kryn, Y Kudenko, VA Kudryavtsev, J Kumpulainen, P Kuusiniemi, J Lagoda, I Lazanu, J-M Levy, RP Litchfield, K Loo, P Loveridge, J Maalampi, L Magaletti, RM Margineanu, J Marteau, C Martin-Mari, V Matveev, K Mavrokoridis, E Mazzucato, N McCauley, A Mercadante, O Mineev, A Mirizzi, B Mitrica, B Morgan, M Murdoch, S Murphy, K Mursula, S Narita, DA Nesterenko, K Nguyen, K Nikolics, E Noah, Y Novikov, H O'Keeffe, J Odell, A Oprima, V Palladino, Y Papaphilippou, S Pascoli, T Patzak, D Payne, M Pectu, E Pennacchio, L Periale, H Pessard, C Pistillo, B Popov, P Przewlocki, M Quinto, E Radicioni, Y Ramachers, PN Ratoff, M Ravonel, M Rayner, F Resnati, O Ristea, A Robert, E Rondio, A Rubbia, K Rummukainen, R Sacco, A Saftoiu, K Sakashita, J Sarkamo, F Sato, N Saviano, E Scantamburlo, F Sergiampietri, D Sgalaberna, E Shaposhnikova, M Slupecki, M Sorel, NJC Spooner, A Stahl, D Stanca, R Steerenberg, AR Sterian, P Sterian, B Still, S Stoica, T Strauss, J Suhonen, V Suvorov, M Szeptycka, R Terri, LF Thompson, G Toma, A Tonazzo, C Touramanis, WH Trzaska, R Tsenov, K Tuominen, A Vacheret, M Valram, G Vankova-Kirilova, F Vanucci, G Vasseur, F Velotti, P Velten, T Viant, H Vincke, A Virtanen, A Vorobyev, D Wark, A Weber, M Weber, C Wiebusch, JR Wilson, S Wu, N Yershov, J Zalipska, M Zito, LAGUNA-LBNO Collaboration


Combined analysis of νμ disappearance and νμ→νe appearance in MINOS using accelerator and atmospheric neutrinos.

Physical review letters 112 (2014) 191801-

P Adamson, I Anghel, A Aurisano, G Barr, M Bishai, A Blake, GJ Bock, D Bogert, SV Cao, CM Castromonte, D Cherdack, S Childress, JAB Coelho, L Corwin, D Cronin-Hennessy, JK de Jong, AV Devan, NE Devenish, MV Diwan, CO Escobar, JJ Evans, E Falk, GJ Feldman, MV Frohne, HR Gallagher, RA Gomes, MC Goodman, P Gouffon, N Graf, R Gran, K Grzelak, A Habig, SR Hahn, J Hartnell, R Hatcher, A Himmel, A Holin, J Huang, J Hylen, GM Irwin, Z Isvan, C James, D Jensen, T Kafka, SMS Kasahara, G Koizumi, M Kordosky, A Kreymer, K Lang, J Ling, PJ Litchfield, P Lucas, WA Mann, ML Marshak, N Mayer, C McGivern, MM Medeiros, R Mehdiyev, JR Meier, MD Messier, DG Michael, WH Miller, SR Mishra, S Moed Sher, CD Moore, L Mualem, J Musser, D Naples, JK Nelson, HB Newman, RJ Nichol, JA Nowak, J O'Connor, M Orchanian, RB Pahlka, J Paley, RB Patterson, G Pawloski, A Perch, S Phan-Budd, RK Plunkett, N Poonthottathil, X Qiu, A Radovic, B Rebel, C Rosenfeld, HA Rubin, MC Sanchez, J Schneps, A Schreckenberger, P Schreiner, R Sharma, A Sousa, N Tagg, RL Talaga, J Thomas, MA Thomson, X Tian, A Timmons, SC Tognini, R Toner, D Torretta, G Tzanakos, J Urheim, P Vahle, B Viren, A Weber, RC Webb, C White, L Whitehead, LH Whitehead, SG Wojcicki, R Zwaska

We report on a new analysis of neutrino oscillations in MINOS using the complete set of accelerator and atmospheric data. The analysis combines the ν(μ) disappearance and ν(e) appearance data using the three-flavor formalism. We measure |Δm(32)(2)| = [2.28-2.46] × 10(-3) eV(2) (68% C.L.) and sin(2)θ(23) = 0.35-0.65 (90% C.L.) in the normal hierarchy, and |Δm(32)(2)| = [2.32-2.53] × 10(-3) eV(2) (68% C.L.) and sin(2)θ(23) = 0.34-0.67 (90% C.L.) in the inverted hierarchy. The data also constrain δ(CP), the θ(23} octant degeneracy and the mass hierarchy; we disfavor 36% (11%) of this three-parameter space at 68% (90%) C.L.


Precise measurement of the neutrino mixing parameter θ23 from muon neutrino disappearance in an off-axis beam.

Physical review letters 112 (2014) 181801-

K Abe, J Adam, H Aihara, T Akiri, C Andreopoulos, S Aoki, A Ariga, T Ariga, S Assylbekov, D Autiero, M Barbi, GJ Barker, G Barr, M Bass, M Batkiewicz, F Bay, SW Bentham, V Berardi, BE Berger, S Berkman, I Bertram, S Bhadra, FDM Blaszczyk, A Blondel, C Bojechko, S Bordoni, SB Boyd, D Brailsford, A Bravar, C Bronner, N Buchanan, RG Calland, J Caravaca Rodríguez, SL Cartwright, R Castillo, MG Catanesi, A Cervera, D Cherdack, G Christodoulou, A Clifton, J Coleman, SJ Coleman, G Collazuol, K Connolly, L Cremonesi, A Dabrowska, I Danko, R Das, S Davis, P de Perio, G De Rosa, T Dealtry, SR Dennis, C Densham, F Di Lodovico, S Di Luise, O Drapier, T Duboyski, K Duffy, F Dufour, J Dumarchez, S Dytman, M Dziewiecki, S Emery, A Ereditato, L Escudero, AJ Finch, L Floetotto, M Friend, Y Fujii, Y Fukuda, AP Furmanski, V Galymov, S Giffin, C Giganti, K Gilje, D Goeldi, T Golan, M Gonin, N Grant, D Gudin, DR Hadley, A Haesler, MD Haigh, P Hamilton, D Hansen, T Hara, M Hartz, T Hasegawa, NC Hastings, Y Hayato, C Hearty, RL Helmer, M Hierholzer, J Hignight, A Hillairet, A Himmel, T Hiraki, S Hirota, J Holeczek, S Horikawa, K Huang, AK Ichikawa, K Ieki, M Ieva, M Ikeda, J Imber, J Insler, TJ Irvine, T Ishida, T Ishii, SJ Ives, E Iwai, K Iyogi, A Izmaylov, A Jacob, B Jamieson, RA Johnson, JH Jo, P Jonsson, CK Jung, M Kabirnezhad, AC Kaboth, T Kajita, H Kakuno, J Kameda, Y Kanazawa, D Karlen, I Karpikov, E Kearns, M Khabibullin, A Khotjantsev, D Kielczewska, T Kikawa, A Kilinski, J Kim, J Kisiel, P Kitching, T Kobayashi, L Koch, A Kolaceke, A Konaka, LL Kormos, A Korzenev, K Koseki, Y Koshio, I Kreslo, W Kropp, H Kubo, Y Kudenko, S Kumaratunga, R Kurjata, T Kutter, J Lagoda, K Laihem, I Lamont, M Laveder, M Lawe, M Lazos, KP Lee, T Lindner, C Lister, RP Litchfield, A Longhin, L Ludovici, M Macaire, L Magaletti, K Mahn, M Malek, S Manly, AD Marino, J Marteau, JF Martin, T Maruyama, J Marzec, EL Mathie, V Matveev, K Mavrokoridis, E Mazzucato, M McCarthy, N McCauley, KS McFarland, C McGrew, C Metelko, M Mezzetto, P Mijakowski, CA Miller, A Minamino, O Mineev, S Mine, A Missert, M Miura, L Monfregola, S Moriyama, TA Mueller, A Murakami, M Murdoch, S Murphy, J Myslik, T Nagasaki, T Nakadaira, M Nakahata, T Nakai, K Nakamura, S Nakayama, T Nakaya, K Nakayoshi, D Naples, C Nielsen, M Nirkko, K Nishikawa, Y Nishimura, HM O'Keeffe, R Ohta, K Okumura, T Okusawa, W Oryszczak, SM Oser, RA Owen, Y Oyama, V Palladino, J Palomino, V Paolone, D Payne, O Perevozchikov, JD Perkin, Y Petrov, L Pickard, ES Pinzon Guerra, C Pistillo, P Plonski, E Poplawska, B Popov, M Posiadala, J-M Poutissou, R Poutissou, P Przewlocki, B Quilain, E Radicioni, PN Ratoff, M Ravonel, MAM Rayner, A Redij, M Reeves, E Reinherz-Aronis, F Retiere, A Robert, PA Rodrigues, P Rojas, E Rondio, S Roth, A Rubbia, D Ruterbories, R Sacco, K Sakashita, F Sánchez, F Sato, E Scantamburlo, K Scholberg, S Schoppmann, J Schwehr, M Scott, Y Seiya, T Sekiguchi, H Sekiya, D Sgalaberna, M Shiozawa, S Short, Y Shustrov, P Sinclair, B Smith, RJ Smith, M Smy, JT Sobczyk, H Sobel, M Sorel, L Southwell, P Stamoulis, J Steinmann, B Still, Y Suda, A Suzuki, K Suzuki, SY Suzuki, Y Suzuki, T Szeglowski, R Tacik, M Tada, S Takahashi, A Takeda, Y Takeuchi, HK Tanaka, HA Tanaka, MM Tanaka, D Terhorst, R Terri, LF Thompson, A Thorley, S Tobayama, W Toki, T Tomura, Y Totsuka, C Touramanis, T Tsukamoto, M Tzanov, Y Uchida, K Ueno, A Vacheret, M Vagins, G Vasseur, T Wachala, AV Waldron, CW Walter, D Wark, MO Wascko, A Weber, R Wendell, RJ Wilkes, MJ Wilking, C Wilkinson, Z Williamson, JR Wilson, RJ Wilson, T Wongjirad, Y Yamada, K Yamamoto, C Yanagisawa, S Yen, N Yershov, M Yokoyama, T Yuan, M Yu, A Zalewska, J Zalipska, L Zambelli, K Zaremba, M Ziembicki, ED Zimmerman, M Zito, J Żmuda, T2K Collaboration

New data from the T2K neutrino oscillation experiment produce the most precise measurement of the neutrino mixing parameter θ23. Using an off-axis neutrino beam with a peak energy of 0.6 GeV and a data set corresponding to 6.57×10(20) protons on target, T2K has fit the energy-dependent νμ oscillation probability to determine oscillation parameters. The 68% confidence limit on sin(2)(θ23) is 0.514(-0.056)(+0.055) (0.511±0.055), assuming normal (inverted) mass hierarchy. The best-fit mass-squared splitting for normal hierarchy is Δm32(2)=(2.51±0.10)×10(-3)  eV(2)/c(4) (inverted hierarchy: Δm13(2)=(2.48±0.10)×10(-3)  eV(2)/c(4)). Adding a model of multinucleon interactions that affect neutrino energy reconstruction is found to produce only small biases in neutrino oscillation parameter extraction at current levels of statistical uncertainty.


Measurement of the intrinsic electron neutrino component in the T2K neutrino beam with the ND280 detector

PHYSICAL REVIEW D 89 (2014) ARTN 092003

K Abe, J Adam, H Aihara, T Akiri, C Andreopoulos, S Aoki, A Ariga, T Ariga, S Assylbekov, D Autiero, M Barbi, GJ Barker, G Barr, M Bass, M Batkiewicz, F Bay, SW Bentham, V Berardi, BE Berger, S Berkman, I Bertram, S Bhadra, FDM Blaszczyk, A Blondel, C Bojechko, S Bordoni, SB Boyd, D Brailsford, A Bravar, C Bronner, N Buchanan, RG Calland, J Caravaca Rodriguez, SL Cartwright, R Castillo, MG Catanesi, A Cervera, D Cherdack, G Christodoulou, A Clifton, J Coleman, SJ Coleman, G Collazuol, K Connolly, L Cremonesi, A Dabrowska, I Danko, R Das, S Davis, P de Perio, G De Rosa, T Dealtry, SR Dennis, C Densham, F Di Lodovico, S Di Luise, O Drapier, T Duboyski, K Duffy, F Dufour, J Dumarchez, S Dytman, M Dziewiecki, S Emery, A Ereditato, L Escudero, AJ Finch, L Floetotto, M Friend, Y Fujii, Y Fukuda, AP Furmanski, V Galymov, S Giffin, C Giganti, K Gilje, D Goeldi, T Golan, JJ Gomez-Cadenas, M Gonin, N Grant, D Gudin, DR Hadley, A Haesler, MD Haigh, P Hamilton, D Hansen, T Hara, M Hartz, T Hasegawa, NC Hastings, Y Hayato, C Hearty, RL Helmer, M Hierholzer, J Hignight, A Hillairet, A Himmel, T Hiraki, S Hirota, J Holeczek, S Horikawa, K Huang, AK Ichikawa, K Ieki, M Ieva, M Ikeda, J Imber, J Insler, TJ Irvine, T Ishida, T Ishii, SJ Ives, E Iwai, K Iyogi, A Izmaylov, A Jacob, B Jamieson, RA Johnson, JH Jo, P Jonsson, CK Jung, M Kabirnezhad, AC Kaboth, T Kajita, H Kakuno, J Kameda, Y Kanazawa, D Karlen, I Karpikov, E Kearns, M Khabibullin, A Khotjantsev, D Kielczewska, T Kikawa, A Kilinski, J Kim, J Kisiel, P Kitching, T Kobayashi, L Koch, A Kolaceke, A Konaka, LL Kormos, A Korzenev, K Koseki, Y Koshio, I Kreslo, W Kropp, H Kubo, Y Kudenko, S Kumaratunga, R Kurjata, T Kutter, J Lagoda, K Laihem, I Lamont, E Larkin, M Laveder, M Lawe, M Lazos, KP Lee, T Lindner, C Lister, RP Litchfield, A Longhin, L Ludovici, M Macaire, L Magaletti, K Mahn, M Malek, S Manly, AD Marino, J Marteau, JF Martin, T Maruyama, J Marzec, EL Mathie, V Matveev, K Mavrokoridis, E Mazzucato, M McCarthy, N McCauley, KS McFarland, C McGrew, C Metelko, M Mezzetto, P Mijakowski, CA Miller, A Minamino, O Mineev, S Mine, A Missert, M Miura, L Monfregola, S Moriyama, TA Mueller, A Murakami, M Murdoch, S Murphy, J Myslik, T Nagasaki, T Nakadaira, M Nakahata, T Nakai, K Nakamura, S Nakayama, T Nakaya, K Nakayoshi, D Naples, C Nielsen, M Nirkko, K Nishikawa, Y Nishimura, HM O'Keeffe, R Ohta, K Okumura, T Okusawa, W Oryszczak, SM Oser, RA Owen, Y Oyama, V Palladino, J Palomino, V Paolone, D Payne, O Perevozchikov, JD Perkin, Y Petrov, L Pickard, ESP Guerra, C Pistillo, P Plonski, E Poplawska, B Popov, M Posiadala, J-M Poutissou, R Poutissou, P Przewlocki, B Quilain, E Radicioni, PN Ratoff, M Ravonel, MAM Rayner, A Redij, M Reeves, E Reinherz-Aronis, F Retiere, A Robert, PA Rodrigues, P Rojas, E Rondio, S Roth, A Rubbia, D Ruterbories, R Sacco, K Sakashita, F Sanchez, F Sato, E Scantamburlo, K Scholberg, S Schoppmann, J Schwehr, M Scott, Y Seiya, T Sekiguchi, H Sekiya, D Sgalaberna, M Shiozawa, S Short, Y Shustrov, P Sinclair, B Smith, RJ Smith, M Smy, JT Sobczyk, H Sobel, M Sorel, L Southwell, P Stamoulis, J Steinmann, B Still, Y Suda, A Suzuki, K Suzuki, SY Suzuki, Y Suzuki, T Szeglowski, R Tacik, M Tada, S Takahashi, A Takeda, Y Takeuchi, HK Tanaka, HA Tanaka, MM Tanaka, D Terhorst, R Terri, LF Thompson, A Thorley, S Tobayama, W Toki, T Tomura, Y Totsuka, C Touramanis, T Tsukamoto, M Tzanov, Y Uchida, K Ueno, A Vacheret, M Vagins, G Vasseur, T Wachala, AV Waldron, CW Walter, D Wark, MO Wascko, A Weber, R Wendell, RJ Wilkes, MJ Wilking, C Wilkinson, Z Williamson, JR Wilson, RJ Wilson, T Wongjirad, Y Yamada, K Yamamoto, C Yanagisawa, S Yen, N Yershov, M Yokoyama, T Yuan, M Yu, A Zalewska, J Zalipska, L Zambelli, K Zaremba, M Ziembicki, ED Zimmerman, M Zito, J Zmuda, T Collaboration


Light sterile neutrino sensitivity at the nuSTORM facility

PHYSICAL REVIEW D 89 (2014) ARTN 071301

D Adey, SK Agarwalla, CM Ankenbrandt, R Asfandiyarov, JJ Back, G Barker, E Baussan, R Bayes, S Bhadra, V Blackmore, A Blondel, SA Bogacz, C Booth, SB Boyd, SG Bramsiepe, A Bravar, SJ Brice, AD Bross, F Cadoux, H Cease, A Cervera, J Cobb, D Colling, P Coloma, L Coney, A Dobbs, J Dobson, A Donini, P Dornan, M Dracos, F Dufour, R Edgecock, M Geelhoed, MA Uchida, T Ghosh, JJ Gomez-Cadenas, A de Gouvea, A Haesler, G Hanson, PF Harrison, M Hartz, P Hernandez, JA Hernando Morata, P Hodgson, P Huber, A Izmaylov, Y Karadzhov, T Kobilarcik, J Kopp, L Kormos, A Korzenev, Y Kuno, A Kurup, P Kyberd, JB Lagrange, A Laing, A Liu, JM Link, K Long, K Mahn, C Mariani, C Martin, J Martin, N McCauley, KT McDonald, O Mena, SR Mishra, N Mokhov, J Morfin, Y Mori, W Murray, D Neuffer, R Nichol, E Noah, MA Palmer, S Parke, S Pascoli, J Pasternak, R Plunkett, M Popovic, P Ratoff, M Ravonel, M Rayner, S Ricciardi, C Rogers, P Rubinov, E Santos, A Sato, T Sen, E Scantamburlo, JK Sedgbeer, DR Smith, PJ Smith, JT Sobczyk, L Soby, FJP Soler, M Sorel, P Snopok, P Stamoulis, L Stanco, S Striganov, HA Tanaka, IJ Taylor, C Touramanis, CD Tunnell, Y Uchida, N Vassilopoulos, MO Wascko, A Weber, MJ Wilking, E Wildner, W Winter, N Collaboration


Measurement of charged jet suppression in Pb-Pb collisions at √s <inf>NN</inf> = 2.76 TeV

Journal of High Energy Physics 2014 (2014)

B Abelev, J Adam, D Adamová, MM Aggarwal, GA Rinella, M Agnello, AG Agocs, A Agostinelli, N Agrawal, Z Ahammed, N Ahmad, AA Masoodi, I Ahmed, SU Ahn, SA Ahn, I Aimo, S Aiola, M Ajaz, A Akindinov, D Aleksandrov, B Alessandro, D Alexandre, A Alici, A Alkin, J Alme, T Alt, V Altini, S Altinpinar, I Altsybeev, CAG Prado, C Andrei, A Andronic, V Anguelov, J Anielski, T Antičić, F Antinori, P Antonioli, L Aphecetche, H Appelshäuser, N Arbor, S Arcelli, N Armesto, R Arnaldi, T Aronsson, IC Arsene, M Arslandok, A Augustinus, R Averbeck, TC Awes, MD Azmi, M Bach, A Badalà, YW Baek, S Bagnasco, R Bailhache, V Bairathi, R Bala, A Baldisseri, FBDS Pedrosa, J Bán, RC Baral, R Barbera, F Barile, GG Barnaföldi, LS Barnby, V Barret, J Bartke, M Basile, N Bastid, S Basu, B Bathen, G Batigne, B Batyunya, PC Batzing, C Baumann, IG Bearden, H Beck, C Bedda, NK Behera, I Belikov, F Bellini, R Bellwied, E Belmont-Moreno, G Bencedi, S Beole, I Berceanu, A Bercuci, Y Berdnikov, D Berenyi, ME Berger, AAE Bergognon, RA Bertens, D Berzano, L Betev, A Bhasin, AK Bhati, B Bhattacharjee, J Bhom, L Bianchi, N Bianchi

A measurement of the transverse momentum spectra of jets in Pb-Pb collisions at √sNN = 2.76TeV is reported. Jets are reconstructed from charged particles using the anti-k T jet algorithm with jet resolution parameters R of 0.2 and 0.3 in pseudo-rapidity |η| < 0.5. The transverse momentum p T of charged particles is measured down to 0.15 GeV/c which gives access to the low p T fragments of the jet. Jets found in heavy-ion collisions are corrected event-by-event for average background density and on an inclusive basis (via unfolding) for residual background fluctuations and detector effects. A strong suppression of jet production in central events with respect to peripheral events is observed. The suppression is found to be similar to the suppression of charged hadrons, which suggests that substantial energy is radiated at angles larger than the jet resolution parameter R = 0.3 considered in the analysis. The fragmentation bias introduced by selecting jets with a high p T leading particle, which rejects jets with a soft fragmentation pattern, has a similar effect on the jet yield for central and peripheral events. The ratio of jet spectra with R = 0.2 and R = 0.3 is found to be similar in Pb-Pb and simulated PYTHIA pp events, indicating no strong broadening of the radial jet structure in the reconstructed jets with R < 0.3. [Figure not available: see fulltext.] © 2014 The Author(s).


Two- and three-pion quantum statistics correlations in Pb-Pb collisions at s N N = 2.76 TeV at the CERN Large Hadron Collider

Physical Review C - Nuclear Physics 89 (2014)

B Abelev, J Adam, D Adamová, MM Aggarwal, GA Rinella, M Agnello, AG Agocs, A Agostinelli, N Agrawal, Z Ahammed, N Ahmad, AA Masoodi, I Ahmed, SU Ahn, SA Ahn, I Aimo, S Aiola, M Ajaz, A Akindinov, D Aleksandrov, B Alessandro, D Alexandre, A Alici, A Alkin, J Alme, T Alt, V Altini, S Altinpinar, I Altsybeev, CAG Prado, C Andrei, A Andronic, V Anguelov, J Anielski, T Antičić, F Antinori, P Antonioli, L Aphecetche, H Appelshäuser, N Arbor, S Arcelli, N Armesto, R Arnaldi, T Aronsson, IC Arsene, M Arslandok, A Augustinus, R Averbeck, TC Awes, MD Azmi, M Bach, A Badalà, YW Baek, S Bagnasco, R Bailhache, V Bairathi, R Bala, A Baldisseri, FBDS Pedrosa, J Bán, RC Baral, R Barbera, F Barile, GG Barnaföldi, LS Barnby, V Barret, J Bartke, M Basile, N Bastid, S Basu, B Bathen, G Batigne, B Batyunya, PC Batzing, C Baumann, IG Bearden, H Beck, C Bedda, NK Behera, I Belikov, F Bellini, R Bellwied, E Belmont-Moreno, G Bencedi, S Beole, I Berceanu, A Bercuci, Y Berdnikov, D Berenyi, ME Berger, AAE Bergognon, RA Bertens, D Berzano, L Betev, A Bhasin, AK Bhati, B Bhattacharjee, J Bhom, L Bianchi, N Bianchi

Correlations induced by quantum statistics are sensitive to the spatiotemporal extent as well as dynamics of particle-emitting sources in heavy-ion collisions. In addition, such correlations can be used to search for the presence of a coherent component of pion production. Two- and three-pion correlations of same and mixed charge are measured at low relative momentum to estimate the coherent fraction of charged pions in Pb-Pb collisions at sNN=2.76 TeV at the CERN Large Hadron Collider with ALICE. The genuine three-pion quantum statistics correlation is found to be suppressed relative to the two-pion correlation based on the assumption of fully chaotic pion emission. The suppression is observed to decrease with triplet momentum. The observed suppression at low triplet momentum may correspond to a coherent fraction in charged-pion emission of 23%±8% © 2014 CERN, for the Alice Collaboration.


Observation of electron neutrino appearance in a muon neutrino beam.

Phys Rev Lett 112 (2014) 061802-

K Abe, J Adam, H Aihara, T Akiri, C Andreopoulos, S Aoki, A Ariga, T Ariga, S Assylbekov, D Autiero, M Barbi, GJ Barker, G Barr, M Bass, M Batkiewicz, F Bay, SW Bentham, V Berardi, BE Berger, S Berkman, I Bertram, S Bhadra, FDM Blaszczyk, A Blondel, C Bojechko, S Bordoni, SB Boyd, D Brailsford, A Bravar, C Bronner, N Buchanan, RG Calland, J Caravaca Rodríguez, SL Cartwright, R Castillo, MG Catanesi, A Cervera, D Cherdack, G Christodoulou, A Clifton, J Coleman, SJ Coleman, G Collazuol, K Connolly, L Cremonesi, A Dabrowska, I Danko, R Das, S Davis, P de Perio, G De Rosa, T Dealtry, SR Dennis, C Densham, F Di Lodovico, S Di Luise, O Drapier, T Duboyski, K Duffy, F Dufour, J Dumarchez, S Dytman, M Dziewiecki, S Emery, A Ereditato, L Escudero, AJ Finch, L Floetotto, M Friend, Y Fujii, Y Fukuda, AP Furmanski, V Galymov, A Gaudin, S Giffin, C Giganti, K Gilje, D Goeldi, T Golan, JJ Gomez-Cadenas, M Gonin, N Grant, D Gudin, DR Hadley, A Haesler, MD Haigh, P Hamilton, D Hansen, T Hara, M Hartz, T Hasegawa, NC Hastings, Y Hayato, C Hearty, RL Helmer, M Hierholzer, J Hignight, A Hillairet, A Himmel, T Hiraki, S Hirota, J Holeczek, S Horikawa, K Huang, AK Ichikawa, K Ieki, M Ieva, M Ikeda, J Imber, J Insler, TJ Irvine, T Ishida, T Ishii, SJ Ives, K Iyogi, A Izmaylov, A Jacob, B Jamieson, RA Johnson, JH Jo, P Jonsson, CK Jung, AC Kaboth, T Kajita, H Kakuno, J Kameda, Y Kanazawa, D Karlen, I Karpikov, E Kearns, M Khabibullin, A Khotjantsev, D Kielczewska, T Kikawa, A Kilinski, J Kim, J Kisiel, P Kitching, T Kobayashi, L Koch, A Kolaceke, A Konaka, LL Kormos, A Korzenev, K Koseki, Y Koshio, I Kreslo, W Kropp, H Kubo, Y Kudenko, S Kumaratunga, R Kurjata, T Kutter, J Lagoda, K Laihem, I Lamont, M Laveder, M Lawe, M Lazos, KP Lee, C Licciardi, T Lindner, C Lister, RP Litchfield, A Longhin, L Ludovici, M Macaire, L Magaletti, K Mahn, M Malek, S Manly, AD Marino, J Marteau, JF Martin, T Maruyama, J Marzec, EL Mathie, V Matveev, K Mavrokoridis, E Mazzucato, M McCarthy, N McCauley, KS McFarland, C McGrew, C Metelko, M Mezzetto, P Mijakowski, CA Miller, A Minamino, O Mineev, S Mine, A Missert, M Miura, L Monfregola, S Moriyama, TA Mueller, A Murakami, M Murdoch, S Murphy, J Myslik, T Nagasaki, T Nakadaira, M Nakahata, T Nakai, K Nakamura, S Nakayama, T Nakaya, K Nakayoshi, D Naples, C Nielsen, M Nirkko, K Nishikawa, Y Nishimura, HM O'Keeffe, R Ohta, K Okumura, T Okusawa, W Oryszczak, SM Oser, RA Owen, Y Oyama, V Palladino, V Paolone, D Payne, GF Pearce, O Perevozchikov, JD Perkin, Y Petrov, LJ Pickard, ES Pinzon Guerra, C Pistillo, P Plonski, E Poplawska, B Popov, M Posiadala, J-M Poutissou, R Poutissou, P Przewlocki, B Quilain, E Radicioni, PN Ratoff, M Ravonel, MAM Rayner, A Redij, M Reeves, E Reinherz-Aronis, F Retiere, A Robert, PA Rodrigues, P Rojas, E Rondio, S Roth, A Rubbia, D Ruterbories, R Sacco, K Sakashita, F Sánchez, F Sato, E Scantamburlo, K Scholberg, J Schwehr, M Scott, Y Seiya, T Sekiguchi, H Sekiya, D Sgalaberna, M Shiozawa, S Short, Y Shustrov, P Sinclair, B Smith, RJ Smith, M Smy, JT Sobczyk, H Sobel, M Sorel, L Southwell, P Stamoulis, J Steinmann, B Still, Y Suda, A Suzuki, K Suzuki, SY Suzuki, Y Suzuki, T Szeglowski, R Tacik, M Tada, S Takahashi, A Takeda, Y Takeuchi, HK Tanaka, HA Tanaka, MM Tanaka, D Terhorst, R Terri, LF Thompson, A Thorley, S Tobayama, W Toki, T Tomura, Y Totsuka, C Touramanis, T Tsukamoto, M Tzanov, Y Uchida, K Ueno, A Vacheret, M Vagins, G Vasseur, T Wachala, AV Waldron, CW Walter, D Wark, MO Wascko, A Weber, R Wendell, RJ Wilkes, MJ Wilking, C Wilkinson, Z Williamson, JR Wilson, RJ Wilson, T Wongjirad, Y Yamada, K Yamamoto, C Yanagisawa, S Yen, N Yershov, M Yokoyama, T Yuan, A Zalewska, J Zalipska, L Zambelli, K Zaremba, M Ziembicki, ED Zimmerman, M Zito, J Zmuda, T2K Collaboration

The T2K experiment has observed electron neutrino appearance in a muon neutrino beam produced 295 km from the Super-Kamiokande detector with a peak energy of 0.6 GeV. A total of 28 electron neutrino events were detected with an energy distribution consistent with an appearance signal, corresponding to a significance of 7.3σ when compared to 4.92±0.55 expected background events. In the Pontecorvo-Maki-Nakagawa-Sakata mixing model, the electron neutrino appearance signal depends on several parameters including three mixing angles θ12, θ23, θ13, a mass difference Δm(32)(2) and a CP violating phase δ(CP). In this neutrino oscillation scenario, assuming |Δm(32)(2)|=2.4×10(-3)  eV(2), sin(2)θ(23)=0.5, and Δm322>0 (Δm(32)(2)<0), a best-fit value of sin(2)2θ(13)=0.140(-0.032)(+0.038) (0.170(-0.037)(+0.045)) is obtained at δ(CP)=0. When combining the result with the current best knowledge of oscillation parameters including the world average value of θ(13) from reactor experiments, some values of δ(CP) are disfavored at the 90% C.L.


J/Ψ production and nuclear effects in p-Pb collisions at √sNN=5.02 TeV

Journal of High Energy Physics 2014 (2014)

B Abelev, J Adam, D Adamová, AM Adare, MM Aggarwal, GA Rinella, M Agnello, AG Agocs, A Agostinelli, Z Ahammed, N Ahmad, AA Masoodi, I Ahmed, SU Ahn, SA Ahn, I Aimo, S Aiola, M Ajaz, A Akindinov, D Aleksandrov, B Alessandro, D Alexandre, A Alici, A Alkin, J Alme, T Alt, V Altini, S Altinpinar, I Altsybeev, CAG Prado, C Andrei, A Andronic, V Anguelov, J Anielski, T Antičić, F Antinori, P Antonioli, L Aphecetche, H Appelshäuser, N Arbor, S Arcelli, N Armesto, R Arnaldi, T Aronsson, IC Arsene, M Arslandok, A Augustinus, R Averbeck, TC Awes, MD Azmi, M Bach, A Badalà, YW Baek, R Bailhache, V Bairathi, R Bala, A Baldisseri, FB Dos Santos Pedrosa, J Bán, RC Baral, R Barbera, F Barile, GG Barnaföldi, LS Barnby, V Barret, J Bartke, M Basile, N Bastid, S Basu, B Bathen, G Batigne, B Batyunya, PC Batzing, C Baumann, IG Bearden, H Beck, NK Behera, I Belikov, F Bellini, R Bellwied, E Belmont-Moreno, G Bencedi, S Beole, I Berceanu, A Bercuci, Y Berdnikov, D Berenyi, AAE Bergognon, RA Bertens, D Berzano, L Betev, A Bhasin, AK Bhati, J Bhom, N Bianchi, L Bianchi, J Bielčík, J Bielčíková, A Bilandzic, S Bjelogrlic

Inclusive J/Ψ production has been studied with the ALICE detector in p-Pb collisions at the nucleon-nucleon center of mass energy √sNN = 5.02TeV at the CERN LHC. The measurement is performed in the center of mass rapidity domains 2.03 < ycms < 3.53 and ?4.46 < ycms < ?2.96, down to zero transverse momentum, studying the μ+μ? decay mode. In this paper, the J/Ψ production cross section and the nuclear modification factor RpPb for the rapidities under study are presented. While at forward rapidity, corresponding to the proton direction, a suppression of the J/Ψ yield with respect to binary-scaled pp collisions is observed, in the backward region no suppression is present. The ratio of the forward and backward yields is also measured differentially in rapidity and transverse momentum. Theoretical predictions based on nuclear shadowing, as well as on models including, in addition, a contribution from partonic energy loss, are in fair agreement with the experimental results.


Beam-helicity asymmetry in associated electroproduction of real photons ep -> aEuro parts per thousand e gamma pi N in the Delta-resonance region

JOURNAL OF HIGH ENERGY PHYSICS (2014)

A Airapetian, N Akopov, EC Aschenauer, W Augustyniak, R Avakian, A Avetissian, E Avetisyan, HP Blok, H Boettcher, A Borissov, J Bowles, I Brodski, V Bryzgalov, J Burns, GP Capitani, E Cisbani, G Ciullo, M Contalbrigo, PF Dalpiaz, W Deconinck, R De Leo, E De Sanctis, M Diefenthaler, P Di Nezza, M Dueren, M Ehrenfried, G Elbakian, F Ellinghaus, E Etzelmueller, R Fabbri, S Frullani, G Gapienko, V Gapienko, JG Garcia, F Garibaldi, G Gavrilov, V Gharibyan, F Giordano, S Gliske, M Hartig, D Hasch, Y Holler, I Hristova, A Ivanilov, HE Jackson, S Joosten, R Kaiser, G Karyan, T Keri, E Kinney, A Kisselev, V Korotkov, V Kozlov, P Kravchenko, VG Krivokhijine, L Lagamba, L Lapikas, I Lehmann, P Lenisa, W Lorenzon, X-G Lu, B-Q Ma, D Mahon, NCR Makins, SI Manaenkov, Y Mao, B Marianski, H Marukyan, CA Miller, Y Miyachi, A Movsisyan, V Muccifora, M Murray, A Mussgiller, Y Naryshkin, A Nass, M Negodaev, W-D Nowak, LL Pappalardo, R Perez-Benito, A Petrosyan, PE Reimer, AR Reolon, C Riedl, K Rith, G Rosner, Rostomyan, J Rubin, D Ryckbosch, Y Salomatin, A Schaefer, G Schnell, B Seitz, T-A Shibata, M Stahl, M Statera, E Steffens, JJM Steijger, J Stewart, F Stinzing, S Taroian, A Terkulov, R Truty, A Trzcinski, M Tytgat, Y Van Haarlem, C Van Hulse, V Vikhrov, I Vilardi, S Wang, S Yaschenko, Z Ye, S Yen, V Zagrebelnyy, B Zihlmann, P Zupranski, HERMES Collaboration


Multi-strange baryon production at mid-rapidity in Pb-Pb collisions at √s<inf>NN</inf>=2.76 TeV

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 728 (2014) 216-227

B Abelev, J Adam, D Adamová, AM Adare, MM Aggarwal, G Aglieri Rinella, M Agnello, AG Agocs, A Agostinelli, Z Ahammed, N Ahmad, A Ahmad Masoodi, I Ahmed, SU Ahn, SA Ahn, I Aimo, S Aiola, M Ajaz, A Akindinov, D Aleksandrov, B Alessandro, D Alexandre, A Alici, A Alkin, J Alme, T Alt, V Altini, S Altinpinar, I Altsybeev, C Alves Garcia Prado, C Andrei, A Andronic, V Anguelov, J Anielski, T Antičić, F Antinori, P Antonioli, L Aphecetche, H Appelshäuser, N Arbor, S Arcelli, N Armesto, R Arnaldi, T Aronsson, IC Arsene, M Arslandok, A Augustinus, R Averbeck, TC Awes, MD Azmi, M Bach, A Badalà, YW Baek, R Bailhache, V Bairathi, R Bala, A Baldisseri, F Baltasar Dos Santos Pedrosa, J Bán, RC Baral, R Barbera, F Barile, GG Barnaföldi, LS Barnby, V Barret, J Bartke, M Basile, N Bastid, S Basu, B Bathen, G Batigne, B Batyunya, PC Batzing, C Baumann, IG Bearden, H Beck, NK Behera, I Belikov, F Bellini, R Bellwied, E Belmont-Moreno, G Bencedi, S Beole, I Berceanu, A Bercuci, Y Berdnikov, D Berenyi, AAE Bergognon, RA Bertens, D Berzano, L Betev, A Bhasin, AK Bhati, J Bhom, L Bianchi, N Bianchi, J Bielčík, J Bielčíková, A Bilandzic, S Bjelogrlic

The production of Ξ- and ω- baryons and their anti-particles in Pb-Pb collisions at √sNN = 2.76 TeV has been measured using the ALICE detector. The transverse momentum spectra at mid-rapidity (|y| < 0.5) for charged Ξ and ω hyperons have been studied in the range 0.6 < PT < 8.0 GeV/c and 1.2 < PT < 7.0 GeV/c, respectively, and in several centrality intervals (from the most central 0-10% to the most peripheral 60-80% collisions). These spectra have been compared with the predictions of recent hydrodynamic models. In particular, the Kraków and EPOS models give a satisfactory description of the data, with the latter covering a wider PT range. Mid-rapidity yields, integrated over PT, have been determined. The hyperon-to-pion ratios are similar to those at RHIC: they rise smoothly with centrality up to (Npart) ~ 150 and saturate thereafter. The enhancements (yields per participant nucleon relative to those in pp collisions) increase both with the strangeness content of the baryon and with centrality, but are less pronounced than at lower energies. © 2013 The Authors. Published by Elsevier B.V.


Multiplicity dependence of pion, kaon, proton and lambda production in p-Pb collisions at √S<inf>NN</inf> = 5.02 TeV

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 728 (2014) 25-38

B Abelev, J Adam, D Adamová, AM Adare, MM Aggarwal, G Aglieri Rinella, M Agnello, AG Agocs, A Agostinelli, Z Ahammed, N Ahmad, A Ahmad Masoodi, I Ahmed, SU Ahn, SA Ahn, I Aimo, S Aiola, M Ajaz, A Akindinov, D Aleksandrov, B Alessandro, D Alexandre, A Alice, A Alkin, J Alme, T Alt, V Altini, S Altinpinar, I Altsybeev, C Alves Garcia Prado, C Andrei, A Andronic, V Anguelov, J Anielski, T Antičić, F Antinori, P Antonioli, L Aphecetche, H Appelshäuser, N Arbor, S Arcelli, N Armesto, R Arnaldi, T Aronsson, IC Arsene, M Arslandok, A Augustinus, R Averbeck, TC Awes, MD Azmi, M Bach, A Badalà, YW Baek, R Bailhache, V Bairathi, R Bala, A Baldisseri, F Baltasar Dos Santos Pedrosa, J Bán, RC Baral, R Barbera, F Barile, GG Barnaföldi, LS Barnby, V Barret, J Bartke, M Basile, N Bastid, S Basu, B Bathen, G Batigne, B Batyunya, PC Batzing, C Baumann, IG Bearden, H Beck, NK Behera, I Belikov, F Bellini, R Bellwied, E Belmont-Moreno, G Bencedi, S Beole, I Berceanu, A Bercuci, Y Berdnikov, D Berenyi, AAE Bergognon, RA Bertens, D Berzano, L Betev, A Bhasin, AK Bhati, J Bhom, L Bianchi, N Bianchi, J Bielčík, J Bielčíková, A Bilandzic, S Bjelogrlic

In this Letter, comprehensive results on π±, K±, KoS, p(p) and A(A) production at mid-rapidity (0 < yCMS < 0.5) in p-Pb collisions at √SNN = 5.02 TeV, measured by the ALICE detector at the LHC, are reported. The transverse momentum distributions exhibit a hardening as a function of event multiplicity, which is stronger for heavier particles. This behavior is similar to what has been observed in pp and Pb-Pb collisions at the LHC. The measured pT distributions are compared to d-Au, Au-Au and Pb-Pb results at lower energy and with predictions based on QCD-inspired and hydrodynamic models. © 2013 The Authors. Published by Elsevier B.V.


Measurement of hadron composition in charged jets from pp collisions with the ALICE experiment

Nucl. Phys. A931 (2014) 428-432

X Lu


Recent Results from the T2K Experiment

Nuclear Physics B - Proceedings Supplements 246-247 (2014) 23-28

K Abe, N Abgrall, H Aihara, T Akiri, C Andreopoulos, S Aoki, A Ariga, T Ariga, S Assylbekov, D Autiero, M Barbi, GJ Barker, G Barr, M Bass, M Batkiewicz, F Bay, SW Bentham, V Berardi, BE Berger, S Berkman, I Bertram, S Bhadra, FDM Blaszczyk, A Blondel, C Bojechko, SB Boyd, D Brailsford, A Bravar, C Bronner, N Buchanan, RG Calland, J Caravaca Rodríguez, SL Cartwright, R Castillo, MG Catanesi, A Cervera, D Cherdack, G Christodoulou, A Clifton, J Coleman, SJ Coleman, G Collazuol, K Connolly, L Cremonesi, A Curioni, A Dabrowska, I Danko, R Das, S Davis, P de Perio, G De Rosa, T Dealtry, SR Dennis, C Densham, F Di Lodovico, S Di Luise, O Drapier, T Duboyski, F Dufour, J Dumarchez, S Dytman, M Dziewiecki, S Emery, A Ereditato, L Escudero, AJ Finch, E Frank, M Friend, Y Fujii, Y Fukuda, AP Furmanski, V Galymov, A Gaudin, S Giffin, C Giganti, K Gilje, T Golan, JJ Gomez-Cadenas, M Gonin, N Grant, D Gudin, DR Hadley, A Haesler, MD Haigh, P Hamilton, D Hansen, T Hara, M Hartz, T Hasegawa, NC Hastings, Y Hayato, C Hearty, RL Helmer, M Hierholzer, J Hignight, A Hillairet, A Himmel, T Hiraki, S Hirota, J Holeczek

The Tokai to Kamioka (T2K) experiment studies neutrino oscillations using a beam of muon neutrinos produced by an accelerator. The neutrinos travel from J-PARC on the east coast of Japan and are detected 295 kilometers further away in the Super-Kamiokande detector. A complex of near detectors located 280 meters away from the neutrino production target is used to better characterize the neutrino beam and reduce systematic uncertainties. The experiment aims at measuring electronic neutrino appearance (νμ→νe oscillation) to measure the neutrino mixing angle θ13, and muon neutrino disappearance to measure the neutrino mixing angle θ23 and mass splitting |δm322|. We report here electron neutrino appearance results using three years of data, recorded until the 2012 summer, as well as muon neutrino disappearance results based on the data coming from the first two years of the experiment. © 2013 Elsevier B.V.


Multiplicity dependence of the average transverse momentum in pp, p-Pb, and Pb-Pb collisions at the LHC

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 727 (2013) 371-380

B Abelev, J Adam, D Adamová, AM Adare, MM Aggarwal, G Aglieri Rinella, M Agnello, AG Agocs, A Agostinelli, Z Ahammed, A Ahmad Masoodi, N Ahmad, I Ahmed, SA Ahn, SU Ahn, I Aimo, M Ajaz, A Akindinov, D Aleksandrov, B Alessandro, D Alexandre, A Alici, A Alkin, J Alme, T Alt, V Altini, S Altinpinar, I Altsybeev, C Andrei, A Andronic, V Anguelov, J Anielski, C Anson, T Antičić, F Antinori, P Antonioli, L Aphecetche, H Appelshäuser, N Arbor, S Arcelli, A Arend, N Armesto, R Arnaldi, T Aronsson, IC Arsene, M Arslandok, A Asryan, A Augustinus, R Averbeck, TC Awes, J Äystö, MD Azmi, M Bach, A Badalà, YW Baek, R Bailhache, R Bala, A Baldisseri, F Baltasar Dos Santos Pedrosa, J Bán, RC Baral, R Barbera, F Barile, GG Barnaföldi, LS Barnby, V Barret, J Bartke, M Basile, N Bastid, S Basu, B Bathen, G Batigne, B Batyunya, PC Batzing, C Baumann, IG Bearden, H Beck, NK Behera, I Belikov, F Bellini, R Bellwied, E Belmont-Moreno, G Bencedi, S Beole, I Berceanu, A Bercuci, Y Berdnikov, D Berenyi, AAE Bergognon, RA Bertens, D Berzano, L Betev, A Bhasin, AK Bhati, J Bhom, N Bianchi, L Bianchi, C Bianchin, J Bielčík, J Bielčíková

The average transverse momentum 〈pT〉 versus the charged-particle multiplicity Nch was measured in p-Pb collisions at a collision energy per nucleon-nucleon pair sNN=5.02TeV and in pp collisions at collision energies of s=0.9,2.76, and 7TeV in the kinematic range 0.15<pT<10.0GeV/c and |η|<0.3 with the ALICE apparatus at the LHC. These data are compared to results in Pb-Pb collisions at sNN=2.76TeV at similar charged-particle multiplicities. In pp and p-Pb collisions, a strong increase of 〈pT〉 with Nch is observed, which is much stronger than that measured in Pb-Pb collisions. For pp collisions, this could be attributed, within a model of hadronizing strings, to multiple-parton interactions and to a final-state color reconnection mechanism. The data in p-Pb and Pb-Pb collisions cannot be described by an incoherent superposition of nucleon-nucleon collisions and pose a challenge to most of the event generators. © 2013 CERN.

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