Publications


Optimisation of the scintillation light collection and uniformity for the SoLid experiment

Journal of Instrumentation IOP Publishing (0)

Y Abreu, Y Amhis, W Beaumont, M Bongrand, D Boursette, BC Castle, K Clark, B Coupé, D Cussans, AD Roeck, D Durand, M Fallot, L Ghys, L Giot, K Graves, B Guillon, D Henaff, B Hosseini, S Ihantola, S Jenzer, S Kalcheva, LN Kalousis, M Labare, G Lehaut, S Manley, L Manzanillas, J Mermans, I Michiels, C Moortgat, D Newbold, J Park, V Pestel, K Petridis, I Piñera, L Popescu, D Ryckbosch, N Ryder, D Saunders, M-H Schune, M Settimo, L Simard, A Vacheret, G Vandierendonck, SV Dyck, PV Mulders, NV Remortel, S Vercaemer, M Verstraeten, B Viaud, A Weber, F Yermia

This paper presents a comprehensive optimisation study to maximise the light collection efficiency of scintillating cube elements used in the SoLid detector. Very short baseline reactor experiments, like SoLid, look for active to sterile neutrino oscillation signatures in the anti-neutrino energy spectrum as a function of the distance to the core and energy. Performing a precise search requires high light yield of the scintillating elements and uniformity of the response in the detector volume. The SoLid experiment uses an innovative hybrid technology with two different scintillators: polyvinyltoluene scintillator cubes and $^6$LiF:ZnS(Ag) screens. A precision test bench based on a $^{207}$Bi calibration source has been developed to study improvements on the energy resolution and uniformity of the prompt scintillation signal of antineutrino interactions. A trigger system selecting the 1~MeV conversion electrons provides a Gaussian energy peak and allows for precise comparisons of the different detector configurations that were considered to improve the SoLid detector light collection. The light collection efficiency is influenced by the choice of wrapping material, the position of the $^6$LiF:ZnS(Ag) screen, the type of fibre, the number of optical fibres and the type of mirror at the end of the fibre. This study shows that large gains in light collection efficiency are possible compared to the SoLid SM1 prototype. The light yield for the SoLid detector is expected to be at least 52$\pm$2 photo-avalanches per MeV per cube, with a relative non-uniformity of 6 %, demonstrating that the required energy resolution of at least 14 % at 1 MeV can be achieved.


Sensitivity of the T2K accelerator-based neutrino experiment with an Extended run to $20\times10^{21}$ POT

ArXiv (0)

K Abe, C Andreopoulos, M Antonova, S Aoki, A Ariga, D Autiero, S Ban, M Barbi, GJ Barker, G Barr, P Bartet-Friburg, M Batkiewicz, V Berardi, S Berkman, S Bhadra, S Bienstock, A Blondel, S Bolognesi, S Bordoni, SB Boyd, D Brailsford, A Bravar, C Bronner, MB Avanzini, RG Calland, T Campbell, S Cao, SL Cartwright, R Castillo, MG Catanesi, A Cervera, D Cherdack, N Chikuma, G Christodoulou, A Clifton, J Coleman, G Collazuol, D Coplowe, L Cremonesi, A Dabrowska, GD Rosa, T Dealtry, PF Denner, SR Dennis, C Densham, D Dewhurst, FD Lodovico, SD Luise, S Dolan, O Drapier, KE Duffy, J Dumarchez, M Dziewiecki, S Emery-Schrenk, A Ereditato, T Feusels, AJ Finch, GA Fiorentini, M Friend, Y Fujii, D Fukuda, Y Fukuda, AP Furmanski, V Galymov, A Garcia, C Giganti, F Gizzarelli, M Gonin, N Grant, DR Hadley, L Haegel, MD Haigh, D Hansen, J Harada, M Hartz, T Hasegawa, NC Hastings, T Hayashino, Y Hayato, RL Helmer, M Hierholzer, A Hillairet, T Hiraki, A Hiramoto, S Hirota, M Hogan, J Holeczek, F Hosomi, K Huang, AK Ichikawa, M Ikeda, J Imber, J Insler, RA Intonti, T Ishida, T Ishii, E Iwai, K Iwamoto, A Izmaylov, B Jamieson, M Jiang, S Johnson, JH Jo, P Jonsson, CK Jung, M Kabirnezhad, AC Kaboth, T Kajita, H Kakuno, J Kameda, D Karlen, I Karpikov, T Katori, E Kearns, M Khabibullin, A Khotjantsev, H Kim, J Kim, S King, J Kisiel, A Knight, A Knox, T Kobayashi, L Koch, T Koga, A Konaka, K Kondo, A Kopylov, LL Kormos, A Korzenev, Y Koshio, W Kropp, Y Kudenko, R Kurjata, T Kutter, J Lagoda, I Lamont, M Lamoureux, E Larkin, P Lasorak, M Laveder, M Lawe, T Lindner, ZJ Liptak, RP Litchfield, X Li, A Longhin, JP Lopez, T Lou, L Ludovici, X Lu, L Magaletti, K Mahn, M Malek, S Manly, AD Marino, JF Martin, P Martins, S Martynenko, T Maruyama, V Matveev, K Mavrokoridis, WY Ma, E Mazzucato, M McCarthy, N McCauley, KS McFarland, C McGrew, A Mefodiev, C Metelko, M Mezzetto, P Mijakowski, A Minamino, O Mineev, S Mine, A Missert, M Miura, S Moriyama, TA Mueller, J Myslik, T Nakadaira, M Nakahata, KG Nakamura, K Nakamura, KD Nakamura, Y Nakanishi, S Nakayama, T Nakaya, K Nakayoshi, C Nantais, C Nielsen, M Nirkko, K Nishikawa, Y Nishimura, P Novella, J Nowak, HM O'Keeffe, R Ohta, K Okumura, T Okusawa, W Oryszczak, SM Oser, T Ovsyannikova, RA Owen, Y Oyama, V Palladino, JL Palomino, V Paolone, ND Patel, M Pavin, D Payne, JD Perkin, Y Petrov, L Pickard, L Pickering, ESP Guerra, C Pistillo, B Popov, M Posiadala-Zezula, J-M Poutissou, R Poutissou, P Przewlocki, B Quilain, T Radermacher, E Radicioni, PN Ratoff, M Ravonel, MAM Rayner, A Redij, E Reinherz-Aronis, C Riccio, P Rojas, E Rondio, S Roth, A Rubbia, A Rychter, R Sacco, K Sakashita, F Sánchez, E Scantamburlo, K Scholberg, J Schwehr, M Scott, Y Seiya, T Sekiguchi, H Sekiya, D Sgalaberna, R Shah, A Shaikhiev, F Shaker, D Shaw, M Shiozawa, T Shirahige, S Short, M Smy, JT Sobczyk, H Sobel, M Sorel, L Southwell, J Steinmann, T Stewart, P Stowell, Y Suda, S Suvorov, A Suzuki, SY Suzuki, Y Suzuki, R Tacik, M Tada, A Takeda, Y Takeuchi, HK Tanaka, HA Tanaka, D Terhorst, R Terri, T Thakore, LF Thompson, S Tobayama, W Toki, T Tomura, C Touramanis, T Tsukamoto, M Tzanov, Y Uchida, M Vagins, Z Vallari, G Vasseur, T Wachala, CW Walter, D Wark, W Warzycha, MO Wascko, A Weber, R Wendell, RJ Wilkes, MJ Wilking, C Wilkinson, JR Wilson, RJ Wilson, Y Yamada, K Yamamoto, M Yamamoto, C Yanagisawa, T Yano, S Yen, N Yershov, M Yokoyama, J Yoo, K Yoshida, T Yuan, M Yu, A Zalewska, J Zalipska, L Zambelli, K Zaremba, M Ziembicki, ED Zimmerman, M Zito, J Żmuda

Recent measurements at the T2K experiment indicate that CP violation in neutrino mixing may be observed in the future by long-baseline neutrino oscillation experiments. We explore the physics program of an extension to the currently approved T2K running of $7.8\times 10^{21}$ protons-on-target to $20\times 10^{21}$ protons-on-target,aiming at initial observation of CP violation with 3$\,\sigma$ or higher significance for the case of maximum CP violation. With accelerator and beam line upgrades, as well as analysis improvements, this program would occur before the next generation of long-baseline neutrino oscillation experiments that are expected to start operation in 2026.


Radon backgrounds in the DEAP-1 liquid-argon-based Dark Matter detector

ArXiv (0)

P-A Amaudruz, M Batygov, B Beltran, K Boudjemline, MGBBCT Caldwell, M Chen, R Chouinard, BT Cleveland, D Contreras, K Dering, F Duncan, R Ford, RGF Giuliani, MGVV Golovko, P Gorel, K Graham, DR Grant, R Hakobyan, AL Hallin, P Harvey, C Hearns, CJ Jillings, M Kuźniak, I Lawson, O Li, J Lidgard, P Liimatainen, WH Lippincott, R Mathew, AB McDonald, T McElroy, K McFarlane, D McKinsey, A Muir, C Nantais, K Nicolics, J Nikkel, T Noble, E O'Dwyer, KS Olsen, C Ouellet, P Pasuthip, T Pollmann, W Rau, F Retiere, M Ronquest, P Skensved, T Sonley, J Tang, E Vázquez-Jáuregui, L Veloce, M Ward

The DEAP-1 \SI{7}{kg} single phase liquid argon scintillation detector was operated underground at SNOLAB in order to test the techniques and measure the backgrounds inherent to single phase detection, in support of the \mbox{DEAP-3600} Dark Matter detector. Backgrounds in DEAP are controlled through material selection, construction techniques, pulse shape discrimination and event reconstruction. This report details the analysis of background events observed in three iterations of the DEAP-1 detector, and the measures taken to reduce them. The $^{222}$Rn decay rate in the liquid argon was measured to be between 16 and \SI{26}{\micro\becquerel\per\kilogram}. We found that the background spectrum near the region of interest for Dark Matter detection in the DEAP-1 detector can be described considering events from three sources: radon daughters decaying on the surface of the active volume, the expected rate of electromagnetic events misidentified as nuclear recoils due to inefficiencies in the pulse shape discrimination, and leakage of events from outside the fiducial volume due to imperfect position reconstruction. These backgrounds statistically account for all observed events, and they will be strongly reduced in the DEAP-3600 detector due to its higher light yield and simpler geometry.


The T2K Experiment

ArXiv (0)

T Collaboration, K Abe, N Abgrall, H Aihara, Y Ajima, JB Albert, D Allan, P-A Amaudruz, C Andreopoulos, B Andrieu, MD Anerella, C Angelsen, S Aoki, O Araoka, J Argyriades, A Ariga, T Ariga, S Assylbekov, JPAMD André, D Autiero, A Badertscher, O Ballester, M Barbi, GJ Barker, P Baron, G Barr, L Bartoszek, M Batkiewicz, F Bay, S Bentham, V Berardi, BE Berger, H Berns, I Bertram, M Besnier, J Beucher, D Beznosko, S Bhadra, P Birney, D Bishop, E Blackmore, FDM Blaszczyk, J Blocki, A Blondel, A Bodek, C Bojechko, J Bouchez, T Boussuge, SB Boyd, M Boyer, N Braam, R Bradford, A Bravar, K Briggs, JD Brinson, C Bronner, DG Brook-Roberge, M Bryant, N Buchanan, H Budd, M Cadabeschi, RG Calland, D Calvet, JC Rodríguez, J Carroll, SL Cartwright, A Carver, R Castillo, MG Catanesi, C Cavata, A Cazes, A Cervera, JP Charrier, C Chavez, S Choi, S Chollet, G Christodoulou, P Colas, J Coleman, W Coleman, G Collazuol, K Connolly, P Cooke, A Curioni, A Dabrowska, I Danko, R Das, GS Davies, S Davis, M Day, XDL Broise, PD Perio, GD Rosa, T Dealtry, A Debraine, E Delagnes, A Delbart, C Densham, FD Lodovico, SD Luise, PD Tran, J Dobson, J Doornbos, U Dore, O Drapier, F Druillole, F Dufour, J Dumarchez, T Durkin, S Dytman, M Dziewiecki, M Dziomba, B Ellison, S Emery, A Ereditato, JE Escallier, L Escudero, LS Esposito, W Faszer, M Fechner, A Ferrero, A Finch, C Fisher, M Fitton, R Flight, D Forbush, E Frank, K Fransham, Y Fujii, Y Fukuda, M Gallop, V Galymov, GL Ganetis, FC Gannaway, A Gaudin, J Gaweda, A Gendotti, M George, S Giffin, C Giganti, K Gilje, I Giomataris, J Giraud, AK Ghosh, T Golan, M Goldhaber, JJ Gomez-Cadenas, S Gomi, M Gonin, M Goyette, A Grant, N Grant, F Grañena, S Greenwood, P Gumplinger, P Guzowski, MD Haigh, K Hamano, C Hansen, T Hara, PF Harrison, B Hartfiel, M Hartz, T Haruyama, R Hasanen, T Hasegawa, NC Hastings, S Hastings, A Hatzikoutelis, K Hayashi, Y Hayato, TDJ Haycock, C Hearty, RL Helmer, R Henderson, S Herlant, N Higashi, J Hignight, K Hiraide, E Hirose, J Holeczek, N Honkanen, S Horikawa, A Hyndman, AK Ichikawa, K Ieki, M Ieva, M Iida, M Ikeda, J Ilic, J Imber, T Ishida, C Ishihara, T Ishii, SJ Ives, M Iwasaki, K Iyogi, A Izmaylov, B Jamieson, RA Johnson, KK Joo, G Jover-Manas, CK Jung, H Kaji, T Kajita, H Kakuno, J Kameda, K Kaneyuki, D Karlen, K Kasami, V Kasey, I Kato, H Kawamuko, E Kearns, L Kellet, M Khabibullin, M Khaleeq, N Khan, A Khotjantsev, D Kielczewska, T Kikawa, JY Kim, S-B Kim, N Kimura, B Kirby, J Kisiel, P Kitching, T Kobayashi, G Kogan, S Koike, T Komorowski, A Konaka, LL Kormos, A Korzenev, K Koseki, Y Koshio, Y Kouzuma, K Kowalik, V Kravtsov, I Kreslo, W Kropp, H Kubo, J Kubota, Y Kudenko, N Kulkarni, L Kurchaninov, Y Kurimoto, R Kurjata, Y Kurosawa, T Kutter, J Lagoda, K Laihem, R Langstaff, M Laveder, TB Lawson, PT Le, AL Coguie, ML Ross, KP Lee, M Lenckowski, C Licciardi, IT Lim, T Lindner, RP Litchfield, A Longhin, GD Lopez, P Lu, L Ludovici, T Lux, M Macaire, L Magaletti, K Mahn, Y Makida, CJ Malafis, M Malek, S Manly, A Marchionni, C Mark, AD Marino, AJ Marone, J Marteau, JF Martin, T Maruyama, T Maryon, J Marzec, P Masliah, EL Mathie, C Matsumura, K Matsuoka, V Matveev, K Mavrokoridis, E Mazzucato, N McCauley, KS McFarland, C McGrew, T McLachlan, I Mercer, M Messina, W Metcalf, C Metelko, M Mezzetto, P Mijakowski, CA Miller, A Minamino, O Mineev, S Mine, RE Minvielle, G Mituka, M Miura, K Mizouchi, J-P Mols, L Monfregola, E Monmarthe, F Moreau, B Morgan, S Moriyama, D Morris, A Muir, A Murakami, JF Muratore, M Murdoch, S Murphy, J Myslik, G Nagashima, T Nakadaira, M Nakahata, T Nakamoto, K Nakamura, S Nakayama, T Nakaya, D Naples, B Nelson, TC Nicholls, K Nishikawa, H Nishino, K Nitta, F Nizery, JA Nowak, M Noy, Y Obayashi, T Ogitsu, H Ohhata, T Okamura, K Okumura, T Okusawa, C Ohlmann, K Olchanski, R Openshaw, SM Oser, M Otani, RA Owen, Y Oyama, T Ozaki, MY Pac, V Palladino, V Paolone, P Paul, D Payne, GF Pearce, C Pearson, JD Perkin, M Pfleger, F Pierre, D Pierrepont, P Plonski, P Poffenberger, E Poplawska, B Popov, M Posiadala, J-M Poutissou, R Poutissou, R Preece, P Przewlocki, W Qian, JL Raaf, E Radicioni, K Ramos, P Ratoff, TM Raufer, M Ravonel, M Raymond, F Retiere, D Richards, J-L Ritou, A Robert, PA Rodrigues, E Rondio, M Roney, M Rooney, D Ross, B Rossi, S Roth, A Rubbia, D Ruterbories, R Sacco, S Sadler, K Sakashita, F Sanchez, A Sarrat, K Sasaki, P Schaack, J Schmidt, K Scholberg, J Schwehr, M Scott, DI Scully, Y Seiya, T Sekiguchi, H Sekiya, G Sheffer, M Shibata, Y Shimizu, M Shiozawa, S Short, M Siyad, D Smith, RJ Smith, M Smy, J Sobczyk, H Sobel, S Sooriyakumaran, M Sorel, J Spitz, A Stahl, P Stamoulis, O Star, J Statter, L Stawnyczy, J Steinmann, J Steffens, B Still, M Stodulski, J Stone, C Strabel, T Strauss, R Sulej, P Sutcliffe, A Suzuki, K Suzuki, S Suzuki, SY Suzuki, Y Suzuki, Y Suzuki, J Swierblewski, T Szeglowski, M Szeptycka, R Tacik, M Tada, AS Tadepalli, M Taguchi, S Takahashi, A Takeda, Y Takenaga, Y Takeuchi, HA Tanaka, K Tanaka, M Tanaka, MM Tanaka, N Tanimoto, K Tashiro, IJ Taylor, A Terashima, D Terhorst, R Terri, LF Thompson, A Thorley, M Thorpe, W Toki, T Tomaru, Y Totsuka, C Touramanis, T Tsukamoto, V Tvaskis, M Tzanov, Y Uchida, K Ueno, M Usseglio, A Vacheret, M Vagins, JFV Schalkwyk, J-C Vanel, G Vasseur, O Veledar, P Vincent, T Wachala, AV Waldron, CW Walter, PJ Wanderer, MA Ward, GP Ward, D Wark, D Warner, MO Wascko, A Weber, R Wendell, J Wendland, N West, LH Whitehead, G Wikström, RJ Wilkes, MJ Wilking, Z Williamson, JR Wilson, RJ Wilson, K Wong, T Wongjirad, S Yamada, Y Yamada, A Yamamoto, K Yamamoto, Y Yamanoi, H Yamaoka, C Yanagisawa, T Yano, S Yen, N Yershov, M Yokoyama, A Zalewska, J Zalipska, K Zaremba, M Ziembicki, ED Zimmerman, M Zito, J Zmuda

The T2K experiment is a long-baseline neutrino oscillation experiment. Its main goal is to measure the last unknown lepton sector mixing angle {\theta}_{13} by observing {\nu}_e appearance in a {\nu}_{\mu} beam. It also aims to make a precision measurement of the known oscillation parameters, {\Delta}m^{2}_{23} and sin^{2} 2{\theta}_{23}, via {\nu}_{\mu} disappearance studies. Other goals of the experiment include various neutrino cross section measurements and sterile neutrino searches. The experiment uses an intense proton beam generated by the J-PARC accelerator in Tokai, Japan, and is composed of a neutrino beamline, a near detector complex (ND280), and a far detector (Super-Kamiokande) located 295 km away from J-PARC. This paper provides a comprehensive review of the instrumentation aspect of the T2K experiment and a summary of the vital information for each subsystem.


Indication of Electron Neutrino Appearance from an Accelerator-produced Off-axis Muon Neutrino Beam

ArXiv (0)

T Collaboration, K Abe, N Abgrall, Y Ajima, H Aihara, JB Albert, C Andreopoulos, B Andrieu, S Aoki, O Araoka, J Argyriades, A Ariga, T Ariga, S Assylbekov, D Autiero, A Badertscher, M Barbi, GJ Barker, G Barr, M Bass, F Bay, S Bentham, V Berardi, BE Berger, I Bertram, M Besnier, J Beucher, D Beznosko, S Bhadra, FDM Blaszczyk, A Blondel, C Bojechko, J Bouchez, SB Boyd, A Bravar, C Bronner, DG Brook-Roberge, N Buchanan, H Budd, D Calvet, SL Cartwright, A Carver, R Castillo, MG Catanesi, A Cazes, A Cervera, C Chavez, S Choi, G Christodoulou, J Coleman, W Coleman, G Collazuol, K Connolly, A Curioni, A Dabrowska, I Danko, R Das, GS Davies, S Davis, M Day, G DeRosa, JPAMD Andre, P dePerio, A Delbart, C Densham, F DiLodovico, S DiLuise, PD Tran, J Dobson, U Dore, O Drapier, F Dufour, J Dumarchez, S Dytman, M Dziewiecki, M Dziomba, S Emery, A Ereditato, L Escudero, LS Esposito, M Fechner, A Ferrero, AJ Finch, E Frank, Y Fujii, Y Fukuda, V Galymov, FC Gannaway, A Gaudin, A Gendotti, M George, S Giffin, C Giganti, K Gilje, T Golan, M Goldhaber, JJ Gomez-Cadenas, M Gonin, N Grant, A Grant, P Gumplinger, P Guzowski, A Haesler, MD Haigh, K Hamano, C Hansen, D Hansen, T Hara, PF Harrison, B Hartfiel, M Hartz, T Haruyama, T Hasegawa, NC Hastings, S Hastings, A Hatzikoutelis, K Hayashi, Y Hayato, C Hearty, RL Helmer, R Henderson, N Higashi, J Hignight, E Hirose, J Holeczek, S Horikawa, A Hyndman, AK Ichikawa, K Ieki, M Ieva, M Iida, M Ikeda, J Ilic, J Imber, T Ishida, C Ishihara, T Ishii, SJ Ives, M Iwasaki, K Iyogi, A Izmaylov, B Jamieson, RA Johnson, KK Joo, GV Jover-Manas, CK Jung, H Kaji, T Kajita, H Kakuno, J Kameda, K Kaneyuki, D Karlen, K Kasami, I Kato, E Kearns, M Khabibullin, F Khanam, A Khotjantsev, D Kielczewska, T Kikawa, J Kim, JY Kim, SB Kim, N Kimura, B Kirby, J Kisiel, P Kitching, T Kobayashi, G Kogan, S Koike, A Konaka, LL Kormos, A Korzenev, K Koseki, Y Koshio, Y Kouzuma, K Kowalik, V Kravtsov, I Kreslo, W Kropp, H Kubo, Y Kudenko, N Kulkarni, R Kurjata, T Kutter, J Lagoda, K Laihem, M Laveder, KP Lee, PT Le, JM Levy, C Licciardi, IT Lim, T Lindner, RP Litchfield, M Litos, A Longhin, GD Lopez, PF Loverre, L Ludovici, T Lux, M Macaire, K Mahn, Y Makida, M Malek, S Manly, A Marchionni, AD Marino, J Marteau, JF Martin, T Maruyama, T Maryon, J Marzec, P Masliah, EL Mathie, C Matsumura, K Matsuoka, V Matveev, K Mavrokoridis, E Mazzucato, N McCauley, KS McFarland, C McGrew, T McLachlan, M Messina, W Metcalf, C Metelko, M Mezzetto, P Mijakowski, CA Miller, A Minamino, O Mineev, S Mine, AD Missert, G Mituka, M Miura, K Mizouchi, L Monfregola, F Moreau, B Morgan, S Moriyama, A Muir, A Murakami, M Murdoch, S Murphy, J Myslik, T Nakadaira, M Nakahata, T Nakai, K Nakajima, T Nakamoto, K Nakamura, S Nakayama, T Nakaya, D Naples, ML Navin, B Nelson, TC Nicholls, K Nishikawa, H Nishino, JA Nowak, M Noy, Y Obayashi, T Ogitsu, H Ohhata, T Okamura, K Okumura, T Okusawa, SM Oser, M Otani, RA Owen, Y Oyama, T Ozaki, MY Pac, V Palladino, V Paolone, P Paul, D Payne, GF Pearce, JD Perkin, V Pettinacci, F Pierre, E Poplawska, B Popov, M Posiadala, J-M Poutissou, R Poutissou, P Przewlocki, W Qian, JL Raaf, E Radicioni, PN Ratoff, TM Raufer, M Ravonel, M Raymond, F Retiere, A Robert, PA Rodrigues, E Rondio, JM Roney, B Rossi, S Roth, A Rubbia, D Ruterbories, S Sabouri, R Sacco, K Sakashita, F Sanchez, A Sarrat, K Sasaki, K Scholberg, J Schwehr, M Scott, DI Scully, Y Seiya, T Sekiguchi, H Sekiya, M Shibata, Y Shimizu, M Shiozawa, S Short, M Syiad, RJ Smith, M Smy, JT Sobczyk, H Sobel, M Sorel, A Stahl, P Stamoulis, J Steinmann, B Still, J Stone, C Strabel, LR Sulak, R Sulej, P Sutcliffe, A Suzuki, K Suzuki, S Suzuki, SY Suzuki, Y Suzuki, Y Suzuki, T Szeglowski, M Szeptycka, R Tacik, M Tada, S Takahashi, A Takeda, Y Takenaga, Y Takeuchi, K Tanaka, HA Tanaka, M Tanaka, MM Tanaka, N Tanimoto, K Tashiro, I Taylor, A Terashima, D Terhorst, R Terri, LF Thompson, A Thorley, W Toki, T Tomaru, Y Totsuka, C Touramanis, T Tsukamoto, M Tzanov, Y Uchida, K Ueno, A Vacheret, M Vagins, G Vasseur, T Wachala, JJ Walding, AV Waldron, CW Walter, PJ Wanderer, J Wang, MA Ward, GP Ward, D Wark, MO Wascko, A Weber, R Wendell, N West, LH Whitehead, G Wikstrom, RJ Wilkes, MJ Wilking, JR Wilson, RJ Wilson, T Wongjirad, S Yamada, Y Yamada, A Yamamoto, K Yamamoto, Y Yamanoi, H Yamaoka, C Yanagisawa, T Yano, S Yen, N Yershov, M Yokoyama, A Zalewska, J Zalipska, L Zambelli, K Zaremba, M Ziembicki, ED Zimmerman, M Zito, J Zmuda

The T2K experiment observes indications of $\nu_\mu\rightarrow \nu_e$ appearance in data accumulated with $1.43\times10^{20}$ protons on target. Six events pass all selection criteria at the far detector. In a three-flavor neutrino oscillation scenario with $|\Delta m_{23}^2|=2.4\times10^{-3}$ eV$^2$, $\sin^2 2\theta_{23}=1$ and $\sin^2 2\theta_{13}=0$, the expected number of such events is 1.5$\pm$0.3(syst.). Under this hypothesis, the probability to observe six or more candidate events is 7$\times10^{-3}$, equivalent to 2.5$\sigma$ significance. At 90% C.L., the data are consistent with 0.03(0.04)$<\sin^2 2\theta_{13}<$ 0.28(0.34) for $\delta_{\rm CP}=0$ and a normal (inverted) hierarchy.


Comparison of Three-jet Events in Proton-Antiproton Collisions at Center-of-mass Energy 1.8 TeV to Predictions from a Next-to-leading Order QCD Calculation

ArXiv (0)

D Acosta, T Affolder, MG Albrow, D Ambrose, D Amidei, K Anikeev, J Antos, G Apollinari, T Arisawa, A Artikov, W Ashmanskas, F Azfar, P Azzi-Bacchetta, N Bacchetta, H Bachacou, W Badgett, A Barbaro-Galtieri, VE Barnes, BA Barnett, S Baroiant, M Barone, G Bauer, F Bedeschi, S Behari, S Belforte, WH Bell, G Bellettini, J Bellinger, D Benjamin, A Beretvas, A Bhatti, M Binkley, D Bisello, M Bishai, RE Blair, C Blocker, K Bloom, B Blumenfeld, A Bocci, A Bodek, G Bolla, A Bolshov, D Bortoletto, J Boudreau, C Bromberg, E Brubaker, J Budagov, HS Budd, K Burkett, G Busetto, KL Byrum, S Cabrera, M Campbell, W Carithers, D Carlsmith, A Castro, D Cauz, A Cerri, L Cerrito, J Chapman, C Chen, YC Chen, M Chertok, G Chiarelli, G Chlachidze, F Chlebana, ML Chu, JY Chung, W-H Chung, YS Chung, CI Ciobanu, AG Clark, M Coca, A Connolly, M Convery, J Conway, M Cordelli, J Cranshaw, R Culbertson, D Dagenhart, S D'Auria, PD Barbaro, SD Cecco, S Dell'Agnello, M Dell'Orso, S Demers, L Demortier, M Deninno, DD Pedis, PF Derwent, C Dionisi, JR Dittmann, A Dominguez, S Donati, M D'Onofrio, T Dorigo, N Eddy, R Erbacher, D Errede, S Errede, R Eusebi, S Farrington, RG Feild, JP Fernandez, C Ferretti, RD Field, I Fiori, B Flaugher, LR Flores-Castillo, GW Foster, M Franklin, J Friedman, I Furic, M Gallinaro, AF Garfinkel, C Gay, DW Gerdes, E Gerstein, S Giagu, P Giannetti, K Giolo, M Giordani, P Giromini, V Glagolev, D Glenzinski, M Gold, N Goldschmidt, J Goldstein, G Gomez, M Goncharov, I Gorelov, AT Goshaw, Y Gotra, K Goulianos, A Gresele, C Grosso-Pilcher, M Guenther, JGD Costa, C Haber, SR Hahn, E Halkiadakis, R Handler, F Happacher, K Hara, RM Harris, F Hartmann, K Hatakeyama, J Hauser, J Heinrich, M Hennecke, M Herndon, C Hill, A Hocker, KD Hoffman, S Hou, BT Huffman, R Hughes, J Huston, C Issever, J Incandela, G Introzzi, M Iori, A Ivanov, Y Iwata, B Iyutin, E James, M Jones, T Kamon, J Kang, MK Unel, S Kartal, H Kasha, Y Kato, RD Kennedy, R Kephart, B Kilminster, DH Kim, HS Kim, MJ Kim, SB Kim, SH Kim, TH Kim, YK Kim, M Kirby, L Kirsch, S Klimenko, P Koehn, K Kondo, J Konigsberg, A Korn, A Korytov, J Kroll, M Kruse, V Krutelyov, SE Kuhlmann, N Kuznetsova, AT Laasanen, S Lami, S Lammel, J Lancaster, K Lannon, M Lancaster, R Lander, A Lath, G Latino, T LeCompte, Y Le, J Lee, SW Lee, N Leonardo, S Leone, JD Lewis, K Li, CS Lin, M Lindgren, TM Liss, T Liu, DO Litvintsev, NS Lockyer, A Loginov, M Loreti, D Lucchesi, P Lukens, L Lyons, J Lys, R Madrak, K Maeshima, P Maksimovic, L Malferrari, M Mangano, G Manca, M Mariotti, M Martin, A Martin, V Martin, M Martinez, P Mazzanti, KS McFarland, P McIntyre, M Menguzzato, A Menzione, P Merkel, C Mesropian, A Meyer, T Miao, R Miller, JS Miller, S Miscetti, G Mitselmakher, N Moggi, R Moore, T Moulik, M Mulhearn, A Mukherjee, T Muller, A Munar, P Murat, J Nachtman, S Nahn, I Nakano, R Napora, F Niell, C Nelson, T Nelson, C Neu, MS Neubauer, C Newman-Holmes, T Nigmanov, L Nodulman, SH Oh, YD Oh, T Ohsugi, T Okusawa, W Orejudos, C Pagliarone, F Palmonari, R Paoletti, V Papadimitriou, J Patrick, G Pauletta, M Paulini, T Pauly, C Paus, D Pellett, A Penzo, TJ Phillips, G Piacentino, J Piedra, KT Pitts, A Pompos, L Pondrom, G Pope, T Pratt, F Prokoshin, J Proudfoot, F Ptohos, O Poukhov, G Punzi, J Rademacker, A Rakitine, F Ratnikov, H Ray, A Reichold, P Renton, M Rescigno, F Rimondi, L Ristori, WJ Robertson, T Rodrigo, S Rolli, L Rosenson, R Roser, R Rossin, C Rott, A Roy, A Ruiz, D Ryan, A Safonov, RS Denis, WK Sakumoto, D Saltzberg, C Sanchez, A Sansoni, L Santi, S Sarkar, P Savard, A Savoy-Navarro, P Schlabach, EE Schmidt, MP Schmidt, M Schmitt, L Scodellaro, A Scribano, A Sedov, S Seidel, Y Seiya, A Semenov, F Semeria, MD Shapiro, PF Shepard, T Shibayama, M Shimojima, M Shochet, A Sidoti, A Sill, P Sinervo, AJ Slaughter, K Sliwa, FD Snider, R Snihur, M Spezziga, F Spinella, M Spiropulu, L Spiegel, A Stefanini, J Strologas, D Stuart, A Sukhanov, K Sumorok, T Suzuki, R Takashima, K Takikawa, M Tanaka, M Tecchio, RJ Tesarek, PK Teng, K Terashi, S Tether, J Thom, TL Thomas, AS Thompson, E Thomson, P Tipton, S Tkaczyk, D Toback, K Tollefson, D Tonelli, M Toennesmann, H Toyoda, W Trischuk, J Tseng, D Tsybychev, N Turini, F Ukegawa, T Unverhau, T Vaiciulis, A Varganov, E Vataga, SV III, G Velev, G Veramendi, R Vidal, I Vila, R Vilar, I Volobouev, MVD Mey, RG Wagner, RL Wagner, W Wagner, Z Wan, C Wang, MJ Wang, SM Wang, B Ward, S Waschke, D Waters, T Watts, M Weber, WCW III, B Whitehouse, AB Wicklund, E Wicklund, HH Williams

The properties of three-jet events with total transverse energy greater than 320 GeV and individual jet energy greater than 20 GeV have been analyzed and compared to absolute predictions from a next-to-leading order (NLO) perturbative QCD calculation. These data, of integrated luminosity 86 pb^-1, were recorded by the CDF Experiment for proton-antiproton collisions at sqrt{s}=1.8 TeV. This study tests a model of higher order QCD processes that result in gluon emission and can be used to estimate the magnitude of the contribution of processes higher than NLO. The total cross section is measured to be 466 +/- 3(stat.)^{+207}_{-70}(syst.) pb. The differential cross section is furthermore measured for all kinematically accessible regions of the Dalitz plane, including those for which the theoretical prediction is unreliable. While the measured cross section is consistent with the theoretical prediction in magnitude, the two differ somewhat in shape in the Dalitz plane.


MEASUREMENT OF THE RATE OF THE DECAY KL- E+E-GAMMA AND OBSERVATION OF A FORM-FACTOR IN THIS DECAY

240 (1990) 283-288

GD Barr, R Carosi, D Coward, D Cundy, N Doble, L Gatignon, V Gibson, P Grafstrom, R Hagelberg, G Kesseler, J Vanderlans, HN Nelson, H Wahl, R Black, DJ Candlin, J Muir, KJ Peach, H Blumer, R Heinz, K Kleinknecht, P Mayer, B Panzer, B Renk, H Rohrer, E Auge, RL Chase, D Fournier, P Heusse, L Iconomidoufayard, I Harrus, AC Schaffer, A Bigi, P Calafiura, M Calvetti, R Casali, C Cerri, R Fantechi, I Mannelli, A Nappi, GM Pierazzini, H Burkhardt, M Holder, A Kreutz, G Quast, M Rost, HG Sander, W Weihs, R Werthenbach, G Zech


A LARGE-AREA TRANSITION RADIATION DETECTOR

294 (1990) 465-472

GD Barr, R Carosi, L Gatignon, V Gibson, R Hagelberg, J Vanderlans, HN Nelson, H Wahl, DJ Candlin, KJ Peach, H Blumer, R Heinz, K Kleinknecht, P Mayer, B Panzer, B Renk, H Rohrer, E Auge, D Fournier, I Harrus, P Heusse, L Iconomidoufayard, AC Schaffer, L Bertanza, A Bigi, P Calafiura, M Calvetti, C Cerri, R Fantechi, G Gargani, I Mannelli, GM Pierazzini, C Becker, H Burkhardt, M Holder, A Kreutz, R Ossa, M Rost, HG Sander


Study of muons from the direction of Cygnus X-3 using an underground proportional-tube array

Physical Review D 42 (1990) 2967-2973

JA Kochocki, WWM Allison, GJ Alner, I Ambats, DS Ayres, LJ Balka, GD Barr, WL Barrett, D Benjamin, P Border, CB Brooks, JH Cobb, DJA Cockerill, K Coover, H Courant, B Dahlin, U Dasgupta, JW Dawson, VW Edwards, TH Fields, LM Kirby-Gallagher, C Garcia-Garcia, RH Giles, MC Goodman, K Heller, S Heppelman, N Hill, JH Hoftiezer, DJ Jankowski, K Johns, T Joyce, T Kafka, PJ Litchfield, FV Lopez, M Lowe, WA Mann, ML Marshak, EN May, L McMaster, RH Milburn, W Miller, A Napier, WP Oliver, GF Pearce, DH Perkins, EA Peterson, LE Price, D Roback, DB Rosen, K Ruddick, B Saitta, JL Schlereth, D Schmid, J Schneps, PD Shield, M Shupe, N Sundaralingam, MA Thomson, JL Thron, S Werkema, N West

From July 1987 through March 1988 an array of proportional wire modules was operated as a muon detector at a depth of 2090 meters water equivalent in the Soudan mine in northern Minnesota. A spatial angular resolution of 1.2°was achieved for muon tracking. A clean sample of 1.02×105 muon trajectories recorded underground is used to search for an excess flux of muons from the direction of Cygnus X-3. For muons within the phase interval [0.6, 0.9] of the source's 4.8-h period, 90%-C.L. upper limits for fluxes arriving within 3°and 1.5°half-angle cones centered on the Cygnus X-3 direction are 8.5×1011 cm-2s-1 and 3.1×10-11 cm-2s-1, respectively. © 1990 The American Physical Society.


The NA31 ε{lunate}'/ε{lunate} measurement

Nuclear Physics B (Proceedings Supplements) 16 (1990) 375-377

G Barr, R Carosi, P Clarke, D Coward, D Cundy, N Doble, L Gatignon, V Gibson, P Grafström, R Hagelberg, G Kesseler, J van der Lans, HN Nelson, H Wahl, R Black, D Candlin, J Muir, KJ Peach, H Blümer, R Heinz, K Kleinknecht, P Mayer, B Panzer, B Renk, H Rohrer, E Augé, RL Chase, D Fournier, I Harrus, P Heusse, L Iconomidou-Fayard, AC Schaffer, L Bertanza, A Bigi, P Calafiura, M Calvetti, R Casali, C Cerri, R Fantecho, S Galeotti, G Gargani, I Mannelli, A Nappi, GM Pierazzini, C Becker, H Burkhardt, M Holder, A Kreutz, G Quast, M Rost, HG Sander, W Weihs, R Werthenbach, G Zech


OBSERVATION OF THE DECAY KL- PI-0-GAMMA-GAMMA

242 (1990) 523-530

GD Barr, R Carosi, D Coward, D Cundy, N Doble, L Gatignon, V Gibson, P Grafstrom, R Hagelberg, G Kesseler, J Vanderlans, HN Nelson, H Wahl, R Black, DJ Candlin, J Muir, KJ Peach, H Blumer, R Heinz, K Kleinknecht, P Mayer, B Panzer, B Renk, H Rohrer, E Auge, D Fournier, P Heusse, L Iconomidoufayard, I Harrus, AM Lutz, O Perdereau, AC Schaffer, L Serin, L Bertanza, A Bigi, P Calafiura, M Calvetti, R Casali, C Cerri, R Fantechi, I Mannelli, A Nappi, GM Pierazzini, H Burkhardt, M Holder, A Kreutz, G Quast, M Rost, HG Sander, W Weihs, R Werthenbach, G Zech


Flux of atmospheric neutrinos

Physical Review D 39 (1989) 3532-3534

G Barr, TK Gaisser, T Stanev

We have repeated a one-dimensional calculation of neutrino fluxes, including the effect of muon polarization on neutrinos from the decay of muons. Fluxes have been calculated as a function of energy and angle with cutoffs appropriate for locations of five deep nucleon-decay experiments. Overall, the e/ ratio increases by 5% (20%) for neutrinos with energies around 200 MeV (2"3 GeV), in agreement with a previous analytic estimate of the effect. © 1989 The American Physical Society.


The NA31 transition radiation detector

IEEE Transactions on Nuclear Science 36 (1989) 66-70

G Barr

We describe a Transition Radiation Detector that has been added to the NA31 CP violation experiment at CERN improve the electron-pion separation. The detector consists of four radiators each followed by a proportional wire chamber. The wire gas (Xc/CHI/He) has the same density as the CO2 in the radiators to minimize the hydrostatic pressure difference. The gas gain of the chambers is stabilized online by monitoring with radioactive sources. We discuss a technique for electron-pion separation, and give results obtained with test beams. © 1989 IEEE


SEARCH FOR THE DECAY KL- PI-OE+E

214 (1988) 303-306

GD Barr, P Clarke, D Coward, D Cundy, N Doble, L Gatignon, V Gibson, R Hagelberg, G Kesseler, J Vanderlans, T Miczaika, HN Nelson, J Steinberger, H Taureg, H Wahl, C Youngman, R Black, DJ Candlin, J Muir, KJ Peach, B Pijlgroms, IP Shipsey, W Stephenson, H Blumer, R Heinz, M Kasemann, K Kleinknecht, P Mayer, B Panzer, B Renk, H Rohrer, E Auge, RL Chase, M Corti, D Fournier, P Heusse, L Iconomidoufayard, I Harrus, AM Lutz, HG Sander, AC Schaffer, L Bertanza, A Bigi, P Calafiura, M Calvetti, R Carosi, R Casali, C Cerri, I Mannelli, A Nappi, GM Pierazzini, H Burkhardt, M Holder, G Quast, M Rost, W Weihs, G Zech


Cosmic-ray neutrinos in the atmosphere

Physical Review D 38 (1988) 85-95

TK Gaisser, T Stanev, G Barr

In this paper we give a complete account of detailed calculations of the flux of neutrinos of atmospheric origin that we have made for detectors at various locations on the globe. The emphasis here is on neutrinos in the energy range around 1 GeV, and we compare the results with recent measurements made with larger underground detectors. A detailed knowledge of the atmospheric cosmic-ray neutrino flux is a prerequisite for evaluating the background for the search for nucleon decay as well as the background for neutrinos of extraterrestrial origin. © 1988 The American Physical Society.


Measurement of the charged-current electron (anti-)neutrino inclusive cross-sections at the T2K off-axis near detector ND280

ArXiv (0)

K Abe, R Akutsu, A Ali, C Alt, C Andreopoulos, L Anthony, M Antonova, S Aoki, A Ariga, T Arihara, Y Asada, Y Ashida, ET Atkin, Y Awataguchi, S Ban, M Barbi, GJ Barker, G Barr, D Barrow, C Barry, M Batkiewicz-Kwasniak, A Beloshapkin, F Bench, V Berardi, L Berns, S Bhadra, S Bienstock, A Blondel, S Bolognesi, T Bonus, B Bourguille, SB Boyd, D Brailsford, A Bravar, DB Berguño, C Bronner, S Bron, A Bubak, MB Avanzini, J Calcutt, T Campbell, S Cao, SL Cartwright, MG Catanesi, A Cervera, A Chappell, C Checchia, D Cherdack, N Chikuma, G Christodoulou, M Cicerchia, J Coleman, G Collazuol, L Cook, D Coplowe, A Cudd, A Dabrowska, GD Rosa, T Dealtry, PF Denner, SR Dennis, C Densham, FD Lodovico, N Dokania, S Dolan, TA Doyle, O Drapier, J Dumarchez, P Dunne, A Eguchi, L Eklund, S Emery-Schrenk, A Ereditato, P Fernandez, T Feusels, AJ Finch, GA Fiorentini, G Fiorillo, C Francois, M Friend, Y Fujii, R Fujita, D Fukuda, R Fukuda, Y Fukuda, K Fusshoeller, C Giganti, T Golan, M Gonin, A Gorin, M Guigue, DR Hadley, JT Haigh, P Hamacher-Baumann, M Hartz, T Hasegawa, S Hassani, NC Hastings, T Hayashino, Y Hayato, A Hiramoto, M Hogan, J Holeczek, NTH Van, F Iacob, AK Ichikawa, M Ikeda, T Ishida, T Ishii, M Ishitsuka, K Iwamoto, A Izmaylov, M Jakkapu, B Jamieson, SJ Jenkins, C Jesús-Valls, M Jiang, S Johnson, P Jonsson, CK Jung, X Junjie, M Kabirnezhad, AC Kaboth, T Kajita, H Kakuno, J Kameda, D Karlen, K Kasetti, Y Kataoka, T Katori, Y Kato, E Kearns, M Khabibullin, A Khotjantsev, T Kikawa, H Kikutani, H Kim, S King, J Kisiel, A Knight, A Knox, T Kobayashi, L Koch, T Koga, A Konaka, LL Kormos, Y Koshio, A Kostin, K Kowalik, H Kubo, Y Kudenko, N Kukita, S Kuribayashi, R Kurjata, T Kutter, M Kuze, L Labarga, J Lagoda, M Lamoureux, M Laveder, M Lawe, M Licciardi, T Lindner, RP Litchfield, SL Liu, X Li, A Longhin, L Ludovici, X Lu, T Lux, LN Machado, L Magaletti, K Mahn, M Malek, S Manly, L Maret, AD Marino, L Marti-Magro, JF Martin, T Maruyama, T Matsubara, K Matsushita, V Matveev, K Mavrokoridis, E Mazzucato, M McCarthy, N McCauley, J McElwee, KS McFarland, C McGrew, A Mefodiev, C Metelko, M Mezzetto, A Minamino, O Mineev, S Mine, M Miura, LM Bueno, S Moriyama, J Morrison, TA Mueller, L Munteanu, S Murphy, Y Nagai, T Nakadaira, M Nakahata, Y Nakajima, A Nakamura, KG Nakamura, K Nakamura, S Nakayama, T Nakaya, K Nakayoshi, C Nantais, CER Naseby, TV Ngoc, K Niewczas, K Nishikawa, Y Nishimura, TS Nonnenmacher, F Nova, P Novella, J Nowak, JC Nugent, HM O'Keeffe, L O'Sullivan, T Odagawa, K Okumura, T Okusawa, SM Oser, RA Owen, Y Oyama, V Palladino, JL Palomino, V Paolone, WC Parker, S Parsa, J Pasternak, P Paudyal, M Pavin, D Payne, GC Penn, L Pickering, C Pidcott, G Pintaudi, ESP Guerra, C Pistillo, B Popov, K Porwit, M Posiadala-Zezula, A Pritchard, B Quilain, T Radermacher, E Radicioni, B Radics, PN Ratoff, E Reinherz-Aronis, C Riccio, E Rondio, S Roth, A Rubbia, AC Ruggeri, C Ruggles, A Rychter, K Sakashita, F Sánchez, G Santucci, CM Schloesser, K Scholberg, J Schwehr, M Scott, Y Seiya, T Sekiguchi, H Sekiya, D Sgalaberna, R Shah, A Shaikhiev, F Shaker, A Shaykina, M Shiozawa, W Shorrock, A Shvartsman, A Smirnov, M Smy, JT Sobczyk, H Sobel, FJP Soler, Y Sonoda, J Steinmann, S Suvorov, A Suzuki, SY Suzuki, Y Suzuki, AA Sztuc, M Tada, M Tajima, A Takeda, Y Takeuchi, HK Tanaka, HA Tanaka, S Tanaka, LF Thompson, W Toki, C Touramanis, T Towstego, KM Tsui, T Tsukamoto, M Tzanov, Y Uchida, M Vagins, S Valder, Z Vallari, D Vargas, G Vasseur, C Vilela, WGS Vinning, T Vladisavljevic, VV Volkov, T Wachala, J Walker, JG Walsh, Y Wang, D Wark, MO Wascko, A Weber, R Wendell, MJ Wilking, C Wilkinson, JR Wilson, RJ Wilson, K Wood, C Wret, Y Yamada, K Yamamoto, C Yanagisawa, G Yang, T Yano, K Yasutome, S Yen, N Yershov, M Yokoyama, T Yoshida, M Yu, A Zalewska, J Zalipska, K Zaremba, G Zarnecki, M Ziembicki, ED Zimmerman, M Zito, S Zsoldos, A Zykova

The electron (anti-)neutrino component of the T2K neutrino beam constitutes the largest background in the measurement of electron (anti-)neutrino appearance at the far detector. The electron neutrino scattering is measured directly with the T2K off-axis near detector, ND280. The selection of the electron (anti-)neutrino events in the plastic scintillator target from both neutrino and anti-neutrino mode beams is discussed in this paper. The flux integrated single differential charged-current inclusive electron (anti-)neutrino cross-sections, $d\sigma/dp$, and the total cross-sections in a limited phase-space in momentum and scattering angle ($p > 300$ MeV/c and $\theta \leq 45^{\circ}$) are measured using a binned maximum likelihood fit and compared to the neutrino Monte Carlo generator predictions, resulting in good agreement.


Slow Fluors for Highly Effective Separation of Cherenkov Light in Liquid Scintillators

arXiv (0)

SD Biller, EJ Leming, JL Paton

The timing and spectral characteristics of four highly efficient, slow fluors are presented for liquid scintillator solutions using linear alkylbenzene (LAB) as the primary solvent. The mixtures exhibit high light yields, but with rise times of several ns or more and decay times on the order of tens of ns. Consequently, such liquid scintillator mixtures can be used for highly effective separation of Cherenkov and scintillation components based on timing in large scale liquid scintillation detectors. Such a separation, showing high light yield and directional information, is demonstrated here on a bench-top scale for electrons with energies extending below 1 MeV. This could have significant consequences for the future development of such detectors for measurements of solar neutrinos and neutrinoless double beta decay as well as providing good directional information for elastic scattering events from supernovae neutrinos and reactor anti-neutrinos, amongst others.


Cloud computing and the Square Kilometer Array

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JC Tseng, Newman R


Heavy Quarkonium Physics

ArXiv (0)

N Brambilla, M Krämer, R Mussa, A Vairo, G Bali, GT Bodwin, E Braaten, E Eichten, S Eidelman, S Godfrey, A Hoang, M Jamin, D Kharzeev, MP Lombardo, C Lourenco, AB Meyer, V Papadimitriou, C Patrignani, M Rosati, MA Sanchis-Lozano, H Satz, J Soto, DZ Besson, D Bettoni, A Böhrer, S Boogert, C-H Chang, P Cooper, P Crochet, S Datta, C Davies, A Deandrea, R Faustov, T Ferguson, R Galik, FA Harris, O Iouchtchenko, O Kaczmarek, F Karsch, M Kienzle, VV Kiselev, SR Klein, P Kroll, A Kronfeld, Y-P Kuang, V Laporta, J Lee, A Leibovich, JP Ma, P Mackenzie, L Maiani, ML Mangano, A Meyer, XH Mo, C Morningstar, A Nairz, J Napolitano, S Olsen, A Penin, P Petreczky, F Piccinini, A Pineda, AD Polosa, L Ramello, R Rapp, J-M Richard, V Riquer, S Ricciardi, E Robutti, O Schneider, E Scomparin, J Simone, T Skwarnicki, G Stancari, IW Stewart, Y Sumino, T Teubner, J Tseng, R Vogt, P Wang, B Yabsley, CZ Yuan, F Zantow, ZG Zhao, A Zieminski

This report is the result of the collaboration and research effort of the Quarkonium Working Group over the last three years. It provides a comprehensive overview of the state of the art in heavy-quarkonium theory and experiment, covering quarkonium spectroscopy, decay, and production, the determination of QCD parameters from quarkonium observables, quarkonia in media, and the effects on quarkonia of physics beyond the Standard Model. An introduction to common theoretical and experimental tools is included. Future opportunities for research in quarkonium physics are also discussed.


Multi-W Events at LHC from a Warped Extra Dimension with Custodial Symmetry

ArXiv (0)

C Dennis, MK Unel, G Servant, J Tseng

Randall-Sundrum models based on SU(2)_L * SU(2)_R with custodial symmetry are compelling frameworks for building alternative models of electroweak symmetry breaking. A particular feature of these models is the likely presence of light Kaluza-Klein fermions related to the right-handed top quark. These can be as light as a few hundred GeV and still compatible with EW precision constraints. In this article, we study the detectability of four-W final states at the LHC, which arise from the pair-production and tW decay of light Kaluza-Klein bottom quarks as well as light Kaluza-Klein quarks carrying electric charge 5/3.

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