Publications


The T2K Experiment

ArXiv (2011)

T Collaboration, N Abgrall, H Aihara, Y Ajima, JB Albert, D Allan, PA 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, SB 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, JP 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, JM 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, JL 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, JC 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.


Search for the disappearance of muon antineutrinos in the NuMI neutrino beam

Physical Review D - Particles, Fields, Gravitation and Cosmology 84 (2011)

DS Ayres, MC Goodman, X Huang, J Paley, S Phan-Budd, MC Sanchez, P Schreiner, RL Talaga, G Tzanakos, M Bishai, MV Diwan, DE Jaffe, J Ling, B Viren, L Whitehead, A Himmel, C Howcroft, DG Michael, L Mualem, HB Newman, JP Ochoa-Ricoux, M Orchanian, RB Patterson, A Blake, J Mitchell, MA Thomson, R Toner, JAB Coelho, CO Escobar, P Adamson, GJ Bock, DJ Boehnlein, D Bogert, S Childress, BC Choudhary, R Hatcher, J Hylen, C James, D Jensen, G Koizumi, A Kreymer, P Lucas, CD Moore, R Pahlka, RK Plunkett, B Rebel, R Sharma, D Torretta, R Zwaska, RA Gomes, S Cavanaugh, GJ Feldman, A Sousa, MV Frohne, N Graf, HA Rubin, C White, L Corwin, N Mayer, MD Messier, S Mufson, J Musser, J Urheim, M Dorman, JJ Evans, A Holin, RJ Nichol, J Thomas, D Cronin-Hennessy, SMS Kasahara, PJ Litchfield, ML Marshak, JR Meier, WH Miller, JA Nowak, A Schreckenberger, M Strait, R Gran, A Habig, N Tagg, C Backhouse, G Barr, JK De Jong, G Tinti, A Weber, IZ Danko, Z Isvan, D Naples, N Grant, J Hartnell, GF Pearce, P Gouffon, SR Mishra, C Rosenfeld, GM Irwin, G Pawloski, X Qiu, SG Wojcicki, T Yang, DJ Auty, NE Devenish, E Falk, G Lefeuvre, MA Tavera, RC Webb, SV Cao, S Kopp, K Lang, L Loiacono, R Mehdiyev, J Ratchford, D Cherdack, HR Gallagher, T Kafka, WA Mann, WP Oliver, J Schneps, K Grzelak, SJ Coleman, M Kordosky, M Mathis, JK Nelson, P Vahle, JJ Walding

We report constraints on antineutrino oscillation parameters that were obtained by using the two MINOS detectors to measure the 7% muon antineutrino component of the NuMI neutrino beam. In the Far Detector, we select 130 events in the charged-current muon antineutrino sample, compared to a prediction of 136.4±11.7(stat)-8.9+10.2(syst) events under the assumption |Δm2|=2.32×103eV2, 2(2θ̄)=1.0. Assuming no oscillations occur at the Near Detector baseline, a fit to the two-flavor oscillation approximation constrains |Δm2|<3.37×103eV2 at the 90% confidence level with 2(2θ̄)=1.0. © 2011 American Physical Society.


Active to sterile neutrino mixing limits from neutral-current interactions in MINOS

Physical Review Letters 107 (2011)

DS Ayres, MC Goodman, X Huang, AM McGowan, J Paley, S Phan-Budd, MC Sanchez, P Schreiner, RL Talaga, P Stamoulis, G Tzanakos, M Bishai, MV Diwan, DE Jaffe, J Ling, B Viren, L Whitehead, A Himmel, L Mualem, HB Newman, M Orchanian, RB Patterson, A Blake, J Mitchell, MA Thomson, R Toner, JAB Coelho, CO Escobar, P Adamson, GJ Bock, DJ Boehnlein, D Bogert, S Childress, D Harris, R Hatcher, J Hylen, C James, D Jensen, G Koizumi, A Kreymer, P Lucas, CD Moore, J Morfín, RK Plunkett, B Rebel, R Sharma, P Shanahan, D Torretta, R Zwaska, RA Gomes, S Cavanaugh, GJ Feldman, A Sousa, MV Frohne, N Graf, HA Rubin, C White, L Corwin, N Mayer, MD Messier, S Mufson, J Musser, J Urheim, M Dorman, JJ Evans, A Holin, RJ Nichol, J Thomas, D Cronin-Hennessy, SMS Kasahara, PJ Litchfield, ML Marshak, JR Meier, WH Miller, JA Nowak, DA Petyt, M Strait, R Gran, A Habig, N Tagg, C Backhouse, G Barr, JK De Jong, R Pittam, PA Rodrigues, G Tinti, A Weber, IZ Danko, Z Isvan, D Naples, N Grant, J Hartnell, J Ilic, TC Nicholls, GF Pearce, TM Raufer, P Gouffon, SR Mishra, C Rosenfeld, GM Irwin, G Pawloski, X Qiu, SG Wojcicki, DJ Auty, NE Devenish, E Falk, G Lefeuvre, E Tetteh-Lartey, RC Webb, S Kopp, K Lang, L Loiacono, R Mehdiyev, J Ratchford, D Cherdack, HR Gallagher, T Kafka, WA Mann, WP Oliver, J Schneps, K Grzelak, SJ Coleman, M Kordosky, JK Nelson, P Vahle, JJ Walding

Results are reported from a search for active to sterile neutrino oscillations in the MINOS long-baseline experiment, based on the observation of neutral-current neutrino interactions, from an exposure to the NuMI neutrino beam of 7.07×1020 protons on target. A total of 802 neutral-current event candidates is observed in the Far Detector, compared to an expected number of 754±28(stat)±37(syst) for oscillations among three active flavors. The fraction f of disappearing ν that may transition to ν is found to be less than 22% at the 90%C.L.


The T2K near detector data acquisition systems

Conference Record - 2010 17th IEEE-NPSS Real Time Conference, RT10 (2010)

M Thorpe, C Angelsen, G Barr, C Metelko, T Nicholls, G Pearce, N West

T2K is a second generation long-baseline experiment in Japan, designed to perform precision studies of neutrino oscillations. A neutrino beam originating at the J-PARC facility is sampled by two near detectors, approximately 280m distant from the source and directed towards the Kamioka underground facility, 295km distant, where the Super-Kamiokande water Cerenkov detector is situated. Both the on-axis (INGRID) and off-axis (ND280) near detectors employ the MIDAS framework for their data acquisition systems. Events are selected via a flexible hardware trigger, which allows mixed operating modes incorporating beam spill, cosmic and calibration triggers. Data are acquired from the front-end electronics over optical gigabit Ethernet links by custom MIDAS front-end applications distributed over a cluster of Linux computers. Event fragments from all sub-detectors are merged and logged on a central backend processor and then copied to remote storage for longterm archival. The system is also designed to allow flexible partitioning of sub-detectors for standalone diagnostics and calibration. We present the design of the DAQ system and report on experience gathered during early operation of the near detectors. © 2010 IEEE.


Characterization and simulation of the response of Multi-Pixel Photon Counters to low light levels

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment (2011)

A Vacheret, GJ Barker, M Dziewiecki, P Guzowski, MD Haigh, B Hartfiel, A Izmaylov, W Johnston, M Khabibullin, A Khotjantsev, Y Kudenko, R Kurjata, T Kutter, T Lindner, P Masliah, J Marzec, O Mineev, Y Musienko, S Oser, F Retière, RO Salih, A Shaikhiev, LF Thompson, MA Ward, RJ Wilson, N Yershov, K Zaremba, M Ziembicki


Improved search for Muon-neutrino to electron-neutrino oscillations in MINOS.

Phys Rev Lett 107 (2011) 181802-

P Adamson, DJ Auty, DS Ayres, C Backhouse, G Barr, M Betancourt, M Bishai, A Blake, GJ Bock, DJ Boehnlein, D Bogert, SV Cao, S Cavanaugh, D Cherdack, S Childress, JA Coelho, L Corwin, D Cronin-Hennessy, IZ Danko, JK de Jong, NE Devenish, MV Diwan, M Dorman, 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, J Hartnell, R Hatcher, A Himmel, A Holin, X Huang, J Hylen, GM Irwin, Z Isvan, DE Jaffe, C James, D Jensen, T Kafka, SM Kasahara, G Koizumi, S Kopp, M Kordosky, A Kreymer, K Lang, G Lefeuvre, J Ling, PJ Litchfield, L Loiacono, P Lucas, WA Mann, ML Marshak, M Mathis, N Mayer, AM McGowan, R Mehdiyev, JR Meier, MD Messier, DG Michael, WH Miller, SR Mishra, J Mitchell, CD Moore, L Mualem, S Mufson, J Musser, D Naples, JK Nelson, HB Newman, RJ Nichol, JA Nowak, JP Ochoa-Ricoux, WP Oliver, M Orchanian, J Paley, RB Patterson, G Pawloski, GF Pearce, S Phan-Budd, RK Plunkett, X Qiu, J Ratchford, B Rebel, C Rosenfeld, HA Rubin, MC Sanchez, J Schneps, A Schreckenberger, P Schreiner, P Shanahan, R Sharma, A Sousa, N Tagg, RL Talaga, J Thomas, MA Thomson, R Toner, D Torretta, G Tzanakos, J Urheim, P Vahle, B Viren, JJ Walding, A Weber, RC Webb, C White, L Whitehead, SG Wojcicki, T Yang, R Zwaska, MINOS Collaboration

We report the results of a search for ν(e) appearance in a ν(μ) beam in the MINOS long-baseline neutrino experiment. With an improved analysis and an increased exposure of 8.2 × 10(20) protons on the NuMI target at Fermilab, we find that 2 sin(2) (θ(23))sin(2)(2θ(13))<0.12(0.20) at 90% confidence level for δ = 0 and the normal (inverted) neutrino mass hierarchy, with a best-fit of 2sin(2) (θ(23))sin(2)(2θ(13)) = 0.041(-0.031)(+0.047) (0.079(-0.053) (+0.071)). The θ(13) = 0 hypothesis is disfavored by the MINOS data at the 89% confidence level.


Characterization and simulation of the response of Multi-Pixel Photon Counters to low light levels

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 656 (2011) 69-83

T Lindner, S Oser, W Johnston, RJ Wilson, A Vacheret, P Guzowski, P Masliah, A Izmaylov, M Khabibullin, A Khotjantsev, Y Kudenko, O Mineev, Y Musienko, A Shaikhiev, N Yershov, B Hartfiel, T Kutter, F Retière, RO Salih, LF Thompson, MA Ward, GJ Barker, MD Haigh, M Dziewiecki, R Kurjata, J Marzec, K Zaremba, M Ziembicki

The calorimeter, range detector and active target elements of the T2K near detectors rely on the Hamamatsu Photonics Multi-Pixel Photon Counters (MPPCs) to detect scintillation light produced by charged particles. Detailed measurements of the MPPC gain, afterpulsing, crosstalk, dark noise, and photon detection efficiency for low light levels are reported. In order to account for the impact of the MPPC behavior on T2K physics observables, a simulation program has been developed based on these measurements. The simulation is used to predict the energy resolution of the detector. Copyright © 2011 Published by Elsevier B.V. All rights reserved.


The T2K near detector data acquisition systems

IEEE Transactions on Nuclear Science 58 (2011) 1800-1806

M Thorpe, C Angelsen, G Barr, C Metelko, T Nicholls, G Pearce, N West

T2K is a second generation long-baseline experiment in Japan, designed to perform precision studies of neutrino oscillations. A neutrino beam originating at the J-PARC facility is sampled by two near detectors, approximately 280 m distant from the source and directed towards the Kamioka underground facility, 295 km distant, where the Super-Kamiokande water Cerenkov detector is situated. Both the on-axis (INGRID) and off-axis (ND280) near detectors employ the MIDAS framework for their data acquisition systems. Events are selected via a flexible hardware trigger, which allows mixed operating modes incorporating beam spill, cosmic and calibration triggers. Data are acquired from the front-end electronics over optical Gigabit Ethernet links by custom MIDAS front-end applications distributed over a cluster of Linux computers. Event fragments from all sub-detectors are merged and logged on a central backend processor and then copied to remote storage for long-term archival. The system is also designed to allow flexible partitioning of sub-detectors for standalone diagnostics and calibration. We present the design of the DAQ system and report on experience gathered during early operation of the near detectors. © 2006 IEEE.


First direct observation of Muon antineutrino disappearance

Physical Review Letters 107 (2011)

DS Ayres, MC Goodman, X Huang, AM McGowan, J Paley, S Phan-Budd, MC Sanchez, P Schreiner, RL Talaga, P Stamoulis, G Tzanakos, M Bishai, MV Diwan, DE Jaffe, J Ling, B Viren, L Whitehead, A Himmel, C Howcroft, L Mualem, HB Newman, JP Ochoa-Ricoux, M Orchanian, RB Patterson, A Blake, J Mitchell, MA Thomson, R Toner, JAB Coelho, CO Escobar, P Adamson, GJ Bock, DJ Boehnlein, D Bogert, S Childress, BC Choudhary, D Harris, R Hatcher, J Hylen, C James, D Jensen, G Koizumi, A Kreymer, P Lucas, CD Moore, J Morfín, RK Plunkett, B Rebel, P Shanahan, R Zwaska, RA Gomes, S Cavanaugh, GJ Feldman, A Sousa, MV Frohne, N Graf, HA Rubin, C White, L Corwin, N Mayer, MD Messier, S Mufson, J Musser, J Urheim, M Dorman, JJ Evans, A Holin, RJ Nichol, J Thomas, D Cronin-Hennessy, SMS Kasahara, PJ Litchfield, ML Marshak, JR Meier, WH Miller, JA Nowak, DA Petyt, M Strait, R Gran, A Habig, N Tagg, C Backhouse, G Barr, JK De Jong, PA Rodrigues, G Tinti, A Weber, IZ Danko, Z Isvan, D Naples, C Andreopoulos, N Grant, J Hartnell, J Ilic, TC Nicholls, GF Pearce, TM Raufer, P Gouffon, SR Mishra, C Rosenfeld, GM Irwin, G Pawloski, X Qiu, SG Wojcicki, T Yang, DJ Auty, NE Devenish, E Falk, G Lefeuvre, E Tetteh-Lartey, RC Webb, S Kopp, K Lang, L Loiacono, R Mehdiyev, R Ospanov, J Ratchford, D Cherdack, HR Gallagher, T Kafka, WA Mann, WP Oliver, J Schneps, K Grzelak, SJ Coleman, M Kordosky, JK Nelson, P Vahle

This Letter reports the first direct observation of muon antineutrino disappearance. The MINOS experiment has taken data with an accelerator beam optimized for ν production, accumulating an exposure of 1.71×1020 protons on target. In the Far Detector, 97 charged current ν events are observed. The no-oscillation hypothesis predicts 156 events and is excluded at 6.3σ. The best fit to oscillation yields |Δm⊃̄2|=[3.36-0.40+0.46(stat)±0.06(syst)] ×10⊃-3eV2, ⊃sin⊃2(2θ̄)=0.86-0.12+0.11(stat) ±0.01(syst). The MINOS ν and ν measurements are consistent at the 2.0% confidence level, assuming identical underlying oscillation parameters. © 2011 American Physical Society.


T2K Status and Future Prospects

Nuclear Physics B - Proceedings Supplements 217 (2011) 169-174

A Vacheret

The goal of the Tokai-to-Kamioka (T2K) experiment is to search for the neutrino oscillation parameter θ13 and determine precisely the value of θ23 and Δmθ232. In this proceeding we describe the T2K baseline and detector systems. We report the performance and stability of the different component during the first run covering the period from January to June 2010. Next year expectation for θ13 sensitivity is also presented. © 2011 Elsevier B.V.


The T2K experiment

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment (2011)

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, JPAM de 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, J Caravaca 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, X De La Broise, P de Perio, G De Rosa, T Dealtry, A Debraine, E Delagnes, A Delbart, C Densham, F Di Lodovico, S Di Luise, P Dinh 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, A Le Coguie, M Le 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, JF Van 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

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 659 (2011) 106-135

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

The T2K experiment is a long baseline neutrino oscillation experiment. Its main goal is to measure the last unknown lepton sector mixing angle θ by observing ν appearance in a ν beam. It also aims to make a precision measurement of the known oscillation parameters, Δ and 2, via ν 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. © 2011 Elsevier B.V. All rights reserved.


Measurement of the neutrino mass splitting and flavor mixing by minos

Physical Review Letters 106 (2011)

DS Ayres, MC Goodman, X Huang, AM McGowan, J Paley, S Phan-Budd, MC Sanchez, P Schreiner, RL Talaga, P Stamoulis, G Tzanakos, M Bishai, MV Diwan, DE Jaffe, J Ling, B Viren, L Whitehead, A Himmel, DG Michael, L Mualem, HB Newman, M Orchanian, RB Patterson, A Blake, J Mitchell, MA Thomson, R Toner, JAB Coelho, CO Escobar, P Adamson, GJ Bock, DJ Boehnlein, D Bogert, S Childress, BC Choudhary, D Harris, R Hatcher, J Hylen, C James, D Jensen, G Koizumi, A Kreymer, P Lucas, CD Moore, J Morfín, RK Plunkett, B Rebel, P Shanahan, R Zwaska, RA Gomes, S Cavanaugh, GJ Feldman, A Sousa, MV Frohne, N Graf, HA Rubin, C White, R Armstrong, L Corwin, N Mayer, MD Messier, S Mufson, J Musser, J Urheim, M Dorman, JJ Evans, A Holin, RJ Nichol, C Smith, J Thomas, D Cronin-Hennessy, SMS Kasahara, PJ Litchfield, ML Marshak, JR Meier, WH Miller, JA Nowak, DA Petyt, M Strait, R Gran, A Habig, N Tagg, C Backhouse, G Barr, JK De Jong, RP Litchfield, PA Rodrigues, G Tinti, A Weber, IZ Danko, Z Isvan, D Naples, C Andreopoulos, N Grant, J Hartnell, J Ilic, GF Pearce, TM Raufer, P Gouffon, SR Mishra, C Rosenfeld, GM Irwin, G Pawloski, X Qiu, SG Wojcicki, T Yang, DJ Auty, NE Devenish, E Falk, G Lefeuvre, RC Webb, S Kopp, K Lang, L Loiacono, R Mehdiyev, R Ospanov, J Ratchford, D Cherdack, HR Gallagher, T Kafka, WA Mann, WP Oliver, J Schneps, K Grzelak, SJ Coleman, M Kordosky, JK Nelson, P Vahle

Measurements of neutrino oscillations using the disappearance of muon neutrinos from the Fermilab NuMI neutrino beam as observed by the two MINOS detectors are reported. New analysis methods have been applied to an enlarged data sample from an exposure of 7.25×1020 protons on target. A fit to neutrino oscillations yields values of |Δm2|=(2.32-0.08+0.12) ×103eV2 for the atmospheric mass splitting and (2θ)>0.90 (90% C.L.) for the mixing angle. Pure neutrino decay and quantum decoherence hypotheses are excluded at 7 and 9 standard deviations, respectively. © 2011 American Physical Society.


Indication of electron neutrino appearance from an accelerator-produced off-axis muon neutrino beam

Physical Review Letters 107 (2011)

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

The T2K experiment observes indications of ν→ν appearance in data accumulated with 1.43×1020 protons on target. Six events pass all selection criteria at the far detector. In a three-flavor neutrino oscillation scenario with |Δm232|=2.4×10⊃- 3eV2, ⊃sin⊃ 22θ=1 and ⊃sin⊃ 22θ=0, the expected number of such events is 1.5±0.3(syst). Under this hypothesis, the probability to observe six or more candidate events is 7×10⊃-3, equivalent to 2.5σ significance. At 90% C.L., the data are consistent with 0.03(0.04) <⊃sin⊃ 22θ<0.28(0.34) for δ= 0 and a normal (inverted) hierarchy.


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

ArXiv (2011)

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, JM 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.


Development of multi-pixel photon counters for the T2K long baseline neutrino experiment

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 623 (2010) 321-323

D Orme, N Nagai, A Minamino, T Nakaya, M Yokoyama, T Nakadaira, T Murakami, M Tanaka, F Retiere, A Vacheret, Y Kudenko

We have developed a multi-pixel photon counter (MPPC) with Hamamatsu Photonics for use in the TokaiKamioka (T2K) long baseline neutrino experiment. A total of 60,000 MPPCs will be used in the T2K near detector, the first time that MPPCs have been used on such a large scale. We have created a test bench to measure the gain, noise rate, crosstalk and afterpulse rate, and photon detection efficiency of 17,686 of these MPPCs. The results of these measurements are presented in this paper. © 2010 Elsevier B.V. All rights reserved.


SEARCHES FOR HIGH-FREQUENCY VARIATIONS IN THE B-8 SOLAR NEUTRINO FLUX AT THE SUDBURY NEUTRINO OBSERVATORY

ASTROPHYSICAL JOURNAL 710 (2010) 540-548

B Aharmim, SN Ahmed, AE Anthony, N Barros, EW Beier, A Bellerive, B Beltran, M Bergevin, SD Biller, K Boudjemline, MG Boulay, TH Burritt, B Cai, YD Chan, D Chauhan, M Chen, BT Cleveland, GA Cox, X Dai, H Deng, J Detwiler, M DiMarco, PJ Doe, G Doucas, P-L Drouin, CA Duba, FA Duncan, M Dunford, ED Earle, SR Elliott, HC Evans, GT Ewan, J Farine, H Fergani, F Fleurot, RJ Ford, JA Formaggio, N Gagnon, JTM Goon, K Graham, E Guillian, S Habib, RL Hahn, AL Hallin, ED Hallman, PJ Harvey, R Hazama, WJ Heintzelman, J Heise, RL Helmer, A Hime, C Howard, MA Howe, M Huang, B Jamieson, NA Jelley, KJ Keeter, JR Klein, LL Kormos, M Kos, C Kraus, CB Krauss, T Kutter, CCM Kyba, J Law, IT Lawson, KT Lesko, JR Leslie, I Levine, JC Loach, R MacLellan, S Majerus, HB Mak, J Maneira, R Martin, N McCauley, AB McDonald, S McGee, ML Miller, B Monreal, J Monroe, B Morissette, BG Nickel, AJ Noble, HM O'Keeffe, NS Oblath, GDO Gann, SM Oser, RA Ott, SJM Peeters, AWP Poon, G Prior, SD Reitzner, K Rielage, BC Robertson, RGH Robertson, MH Schwendener, JA Secrest, SR Seibert, O Simard, D Sinclair, P Skensved, TJ Sonley, LC Stonehill, G Tesic, N Tolich, T Tsui, CD Tunnell, R Van Berg, BA VanDevender, CJ Virtue, BL Wall, D Waller, HWC Tseung, DL Wark, PJS Watson, N West, JF Wilkerson, JR Wilson, JM Wouters, A Wright, M Yeh, F Zhang, K Zuber


Neutrino and antineutrino inclusive charged-current cross section measurements with the MINOS near detector

Physical Review D - Particles, Fields, Gravitation and Cosmology 81 (2010)

DS Ayres, MC Goodman, AM McGowan, MC Sanchez, RL Talaga, P Stamoulis, G Tzanakos, M Zois, MV Frohne, P Schreiner, M Bishai, MV Diwan, DE Jaffe, B Viren, L Whitehead, K Zhang, BC Choudhary, A Himmel, DG Michael, L Mualem, HB Newman, JP Ochoa-Ricoux, RB Patterson, A Blake, JD Chapman, AJ Culling, JS Marshall, J Mitchell, MA Thomson, R Toner, JAB Coelho, CO Escobar, P Adamson, GJ Bock, DJ Boehnlein, D Bogert, S Childress, D Harris, R Hatcher, J Hylen, C James, D Jensen, G Koizumi, A Kreymer, P Lucas, CD Moore, J Morfín, RK Plunkett, RA Rameika, B Rebel, N Saoulidou, P Shanahan, W Smart, R Zwaska, S Cavanaugh, GJ Feldman, A Sousa, JK De Jong, HA Rubin, C White, R Armstrong, C Bower, N Mayer, MD Messier, S Mufson, J Musser, J Paley, J Urheim, M Dorman, JJ Evans, A Holin, M Kordosky, DJ Koskinen, RJ Nichol, C Smith, J Thomas, P Vahle, KE Arms, D Cronin-Hennessy, EW Grashorn, K Heller, SMS Kasahara, Z Krahn, PJ Litchfield, ML Marshak, JR Meier, WH Miller, DA Petyt, M Strait, R Gran, A Habig, N Tagg, C Backhouse, G Barr, K Grzelak, RP Litchfield, R Pittam, TM Raufer, PA Rodrigues, G Tinti, A Weber, N West, D Bhattacharya, IZ Danko, Z Isvan, D Naples, V Paolone, C Andreopoulos, J Hartnell, CJ Metelko, TC Nicholls, GF Pearce, P Gouffon, A Godley, JJ Kim, J Ling, SR Mishra, A Rahaman, C Rosenfeld, GM Irwin, G Pawloski, SG Wojcicki, T Yang, DJ Auty, NE Devenish, E Falk, PG Harris, M Watabe, RC Webb, S Kopp, K Lang, L Loiacono, J Ma, R Mehdiyev, T Osiecki, R Ospanov, Ž Pavlović, D Cherdack, HR Gallagher, T Kafka, WA Mann, WP Oliver, J Schneps, SJ Coleman, JK Nelson, PD Barnes, DM Wright, WL Barrett, AR Erwin, VA Ryabov, VA Tsarev, VK Semenov

The energy dependence of the neutrino-iron and antineutrino-iron inclusive charged-current cross sections and their ratio have been measured using a high-statistics sample with the MINOS near detector exposed to the NuMI beam from the main injector at Fermilab. Neutrino and antineutrino fluxes were determined using a low hadronic energy subsample of charged-current events. We report measurements of ν-Fe (ν̄-Fe) cross section in the energy range 3-50 GeV (5-50 GeV) with precision of 2%-8% (3%-9%) and their ratio which is measured with precision 2%-8%. The data set spans the region from low energy, where accurate measurements are sparse, up to the high-energy scaling region where the cross section is well understood. © 2010 The American Physical Society.


Low-energy-threshold analysis of the Phase I and Phase II data sets of the Sudbury Neutrino Observatory

PHYSICAL REVIEW C 81 (2010) ARTN 055504

B Aharmim, SN Ahmed, AE Anthony, N Barros, EW Beier, A Bellerive, B Beltran, M Bergevin, SD Biller, K Boudjemline, MG Boulay, TH Burritt, B Cai, YD Chan, D Chauhan, M Chen, BT Cleveland, GA Cox, X Dai, H Deng, J Detwiler, M DiMarco, PJ Doe, G Doucas, P-L Drouin, CA Duba, FA Duncan, M Dunford, ED Earle, SR Elliott, HC Evans, GT Ewan, J Farine, H Fergani, F Fleurot, RJ Ford, JA Formaggio, N Gagnon, JT Goon, K Graham, E Guillian, S Habib, RL Hahn, AL Hallin, ED Hallman, PJ Harvey, R Hazama, WJ Heintzelman, J Heise, RL Helmer, A Hime, C Howard, MA Howe, M Huang, B Jamieson, NA Jelley, KJ Keeter, JR Klein, LL Kormos, M Kos, C Kraus, CB Krauss, T Kutter, CCM Kyba, J Law, IT Lawson, KT Lesko, JR Leslie, I Levine, JC Loach, R MacLellan, S Majerus, HB Mak, J Maneira, R Martin, N McCauley, AB McDonald, S McGee, ML Miller, B Monreal, J Monroe, B Morissette, BG Nickel, AJ Noble, HM O'Keeffe, NS Oblath, GDO Gann, SM Oser, RA Ott, SJM Peeters, AWP Poon, G Prior, SD Reitzner, K Rielage, BC Robertson, RGH Robertson, MH Schwendener, JA Secrest, SR Seibert, O Simard, D Sinclair, P Skensved, TJ Sonley, LC Stonehill, G Tesic, N Tolich, T Tsui, CD Tunnell, R Van Berg, BA VanDevender, CJ Virtue, BL Wall, D Waller, HWC Tseung, DL Wark, N West, JF Wilkerson, JR Wilson, JM Wouters, A Wright, M Yeh, F Zhang, K Zuber, SNO Collaboration


Characterization of the 1.3 × 1.3 mm MPPC for the T2K near detectors

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 623 (2010) 201-203

A Vacheret

A new MPPC has been produced by Hamamatsu Photonics for the near detectors of the T2K experiment. We characterized the response of the new device and measured all the main parameters and their dependence on over-voltage and temperature. We present in this paper measurements of crosstalk, after-pulsing and photon detection efficiency. A set of models built on these measurements have been implemented in a Monte Carlo simulation to describe the MPPC response. A very good agreement is found between data and Monte Carlo at various voltages for low light level. © 2010 Elsevier B.V. All rights reserved.