Publications


Combined Analysis of all Three Phases of Solar Neutrino Data from the Sudbury Neutrino Observatory

ArXiv (2011)

SNO Collaboration, B Aharmim, SN Ahmed, AE Anthony, N Barros, EW Beier, A Bellerive, B Beltran, M Bergevin, SD Biller, K Boudjemline, MG Boulay, B Cai, YD Chan, D Chauhan, M Chen, BT Cleveland, GA Cox, X Dai, H Deng, JA Detwiler, M DiMarco, PJ Doe, G Doucas, P-L Drouin, 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, M Huang, P Jagam, B Jamieson, NA Jelley, M Jerkins, KJ Keeter, JR Klein, LL Kormos, M Kos, C Kraus, CB Krauss, A Kruger, T Kutter, CCM Kyba, R Lange, J Law, IT Lawson, KT Lesko, JR Leslie, JC Loach, R MacLellan, S Majerus, HB Mak, J Maneira, R Martin, N McCauley, AB McDonald, SR McGee, ML Miller, B Monreal, J Monroe, BG Nickel, AJ Noble, HM O'Keeffe, NS Oblath, RW Ollerhead, GDO Gann, SM Oser, RA Ott, SJM Peeters, AWP Poon, G Prior, SD Reitzner, K Rielage, BC Robertson, RGH Robertson, RC Rosten, MH Schwendener, JA Secrest, SR Seibert, O Simard, JJ Simpson, P Skensved, TJ Sonley, LC Stonehill, G Tešić, N Tolich, T Tsui, RV Berg, BA VanDevender, CJ Virtue, HWC Tseung, DL Wark, PJS Watson, J Wendland, N West, JF Wilkerson, JR Wilson, JM Wouters, A Wright, M Yeh, F Zhang, K Zuber

We report results from a combined analysis of solar neutrino data from all phases of the Sudbury Neutrino Observatory. By exploiting particle identification information obtained from the proportional counters installed during the third phase, this analysis improved background rejection in that phase of the experiment. The combined analysis resulted in a total flux of active neutrino flavors from 8B decays in the Sun of (5.25 \pm 0.16(stat.)+0.11-0.13(syst.))\times10^6 cm^{-2}s^{-1}. A two-flavor neutrino oscillation analysis yielded \Deltam^2_{21} = (5.6^{+1.9}_{-1.4})\times10^{-5} eV^2 and tan^2{\theta}_{12}= 0.427^{+0.033}_{-0.029}. A three-flavor neutrino oscillation analysis combining this result with results of all other solar neutrino experiments and the KamLAND experiment yielded \Deltam^2_{21} = (7.41^{+0.21}_{-0.19})\times10^{-5} eV^2, tan^2{\theta}_{12} = 0.446^{+0.030}_{-0.029}, and sin^2{\theta}_{13} = (2.5^{+1.8}_{-1.5})\times10^{-2}. This implied an upper bound of sin^2{\theta}_{13} < 0.053 at the 95% confidence level (C.L.).


Search for Lorentz invariance and CPT violation with muon antineutrinos in the MINOS Near Detector

Physical Review D - Particles, Fields, Gravitation and Cosmology 85 (2012)

P Adamson, DS Ayres, GD Barr, MR Bishai, AST Blake, GJ Bock, DJ Boehnlein, DV Bogert, SV Cao, SX Cavanaugh, SR Childress, JAB Coelho, LA Corwin, DP Cronin-Hennessy, IZ Dankó, JK De Jong, NE Devenish, MV Diwan, CO Escobar, JJ Evans, E Falk, GJ Feldman, MV Frohne, HR Gallagher, RA Gomes, MC Goodman, P Gouffon, N Graf, RW Gran, K Grzelak, AT Habig, J Hartnell, RW Hatcher, AI Himmel, A Holin, JE Hylen, GM Irwin, Z Isvan, CB James, DA Jensen, T Kafka, S Kasahara, G Koizumi, SE Kopp, M Kordosky, AE Kreymer, K Lang, J Ling, PJ Litchfield, L Loiacono, PW Lucas, WA Mann, ML Marshak, M Mathis, N Mayer, RR Mehdiyev, JR Meier, MD Messier, WH Miller, SR Mishra, J Mitchell, CD Moore, L Mualem, SL Mufson, JA Musser, DL Naples, JK Nelson, HB Newman, RJ Nichol, JA Nowak, WP Oliver, M Orchanian, RB Pahlka, JM Paley, RB Patterson, G Pawloski, S Phan-Budd, RK Plunkett, X Qiu, A Radovic, J Ratchford, BJ Rebel, C Rosenfeld, HA Rubin, MC Sanchez, J Schneps, A Schreckenberger, PA Schreiner, R Sharma, AB Sousa, M Strait, NJ Tagg, RL Talaga, JP Thomas, MA Thomson, G Tinti, R Toner, D Torretta, GS Tzanakos, J Urheim, PL Vahle, B Viren, JJ Walding, A Weber, RC Webb, CG White, LH Whitehead, SG Wojcicki, RM Zwaska

We have searched for sidereal variations in the rate of antineutrino interactions in the MINOS Near Detector. Using antineutrinos produced by the NuMI beam, we find no statistically significant sidereal modulation in the rate. When this result is placed in the context of the Standard Model Extension theory we are able to place upper limits on the coefficients defining the theory. These limits are used in combination with the results from an earlier analysis of MINOS neutrino data to further constrain the coefficients. © 2012 American Physical Society.


Combining neutrino oscillation experiments with the Feldman-Cousins method

New Journal of Physics 14 (2012)

AV Waldron, MD Haigh, A Weber

In this paper we describe how two or more experimental results can be combined within the procedure of Feldman and Cousins, to provide combined confidence limits on the physical parameters of interest. We demonstrate the technique by combining the recent electron neutrino appearance results from T2K and MINOS. Our best fit point is sin 2 2θ 13 = 0.08 (0.11) and δ = 1.1 (2.0)π; in addition we exclude sin2 2θ 13 = 0 at 2.7σ (2.8σ) for the normal (inverted) neutrino mass hierarchy. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.


The T2K Experiment

ArXiv (2011)

T Collaboration, 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.


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 Δmθ23 2. 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.


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

Physical Review Letters 107 (2011)

P Adamson, DJ Auty, DS Ayres, CJ Backhouse, GD Barr, MR Bishai, AST Blake, GJ Bock, DJ Boehnlein, DV Bogert, SX Cavanaugh, D Cherdack, SR Childress, JAB Coelho, SJ Coleman, LA Corwin, DP Cronin-Hennessy, IZ Dankó, 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, RW Gran, NA Grant, K Grzelak, AT Habig, DA Harris, J Hartnell, RW Hatcher, AI Himmel, A Holin, XT Huang, JE Hylen, JV Ilić, GM Irwin, Z Isvan, DE Jaffe, CB James, DA Jensen, T Kafka, S Kasahara, G Koizumi, SE Kopp, M Kordosky, AE Kreymer, K Lang, G Lefeuvre, J Ling, PJ Litchfield, L Loiacono, PW Lucas, WA Mann, ML Marshak, N Mayer, AM McGowan, RR Mehdiyev, JR Meier, MD Messier, WH Miller, SR Mishra, J Mitchell, CD Moore, JG Morfín, L Mualem, SL Mufson, JA Musser, DL Naples, JK Nelson, HB Newman, RJ Nichol, TC Nicholls, JA Nowak, WP Oliver, M Orchanian, JM Paley, RB Patterson, G Pawloski, GF Pearce, DA Petyt, S Phan-Budd, R Pittam, RK Plunkett, X Qiu, J Ratchford, TM Raufer, BJ Rebel, PAM Rodrigues, C Rosenfeld, HA Rubin, MC Sanchez, J Schneps, PA Schreiner, R Sharma, P Shanahan, AB Sousa, P Stamoulis, M Strait, NJ Tagg, RL Talaga, E Tetteh-Lartey, JP Thomas, MA Thomson, G Tinti, R Toner, D Torretta, GS Tzanakos, J Urheim, PL Vahle, B Viren, JJ Walding, A Weber, RC Webb, CG White, LH Whitehead, SG Wojcicki, RM Zwaska

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 fs of disappearing νμ that may transition to νs is found to be less than 22% at the 90%C.L.


First direct observation of Muon antineutrino disappearance

Physical Review Letters 107 (2011)

P Adamson, C Andreopoulos, DJ Auty, DS Ayres, CJ Backhouse, GD Barr, MR Bishai, AST Blake, GJ Bock, DJ Boehnlein, DV Bogert, SX Cavanaugh, D Cherdack, SR Childress, BC Choudhary, JAB Coelho, SJ Coleman, LA Corwin, DP Cronin-Hennessy, IZ Dankó, 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, RW Gran, NA Grant, K Grzelak, AT Habig, DA Harris, J Hartnell, RW Hatcher, AI Himmel, A Holin, C Howcroft, XT Huang, JE Hylen, JV Ilić, GM Irwin, Z Isvan, DE Jaffe, CB James, DA Jensen, T Kafka, S Kasahara, G Koizumi, SE Kopp, M Kordosky, AE Kreymer, K Lang, G Lefeuvre, J Ling, PJ Litchfield, L Loiacono, PW Lucas, WA Mann, ML Marshak, N Mayer, AM McGowan, RR Mehdiyev, JR Meier, MD Messier, WH Miller, SR Mishra, J Mitchell, CD Moore, JG Morfín, L Mualem, SL Mufson, JA Musser, DL Naples, JK Nelson, HB Newman, RJ Nichol, TC Nicholls, JA Nowak, JP Ochoa-Ricoux, WP Oliver, M Orchanian, R Ospanov, JM Paley, RB Patterson, G Pawloski, GF Pearce, DA Petyt, S Phan-Budd, RK Plunkett, X Qiu, J Ratchford, TM Raufer, BJ Rebel, PAM Rodrigues, C Rosenfeld, HA Rubin, MC Sanchez, J Schneps, PA Schreiner, P Shanahan, AB Sousa, P Stamoulis, M Strait, NJ Tagg, RL Talaga, E Tetteh-Lartey, JP Thomas, MA Thomson, G Tinti, R Toner, GS Tzanakos, J Urheim, PL Vahle, B Viren, A Weber, RC Webb, CG White, LH Whitehead, SG Wojcicki, T Yang, RM Zwaska

This Letter reports the first direct observation of muon antineutrino disappearance. The MINOS experiment has taken data with an accelerator beam optimized for ν̄μ production, accumulating an exposure of 1.71×1020 protons on target. In the Far Detector, 97 charged current ν̄μ 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 νμ and ν̄μ measurements are consistent at the 2.0% confidence level, assuming identical underlying oscillation parameters. © 2011 American Physical Society.


Improved Search for Muon-Neutrino to Electron-Neutrino Oscillations in MINOS

PHYSICAL REVIEW LETTERS 107 (2011) ARTN 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, JAB Coelho, L Corwin, D Cronin-Hennessy, IZ Danko, JK de Jong, NE Devenish, MV Diwan, M Dorman, CO Escobar, J 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, SMS 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


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

A Vacheret, GJ Barker, M Dziewiecki, P Guzowski, MD Haigh, BL Hartfiel, AO Izmaylov, WR Johnston, MM Khabibullin, AN Khotjantsev, YGG Kudenko, RP Kurjata, T Kutter, T Lindner, P Masliah, J Marzec, OV Mineev, YV Musienko, SM Oser, F Retière, RO Salih, AT Shaikhiev, LF Thompson, MA Ward, RJ Wilson, NV Yershov, 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.


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

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

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 |Δm̄2|=2.32×10-3eV2, sin2(2θ̄)=1.0. Assuming no oscillations occur at the Near Detector baseline, a fit to the two-flavor oscillation approximation constrains |Δm̄2|<3.37×10-3eV2 at the 90% confidence level with sin2(2θ̄)=1.0. © 2011 American Physical Society.


Measurement of the neutrino mass splitting and flavor mixing by minos

Physical Review Letters 106 (2011)

P Adamson, C Andreopoulos, RL Armstrong, DJ Auty, DS Ayres, CJ Backhouse, GD Barr, MR Bishai, AST Blake, GJ Bock, DJ Boehnlein, DV Bogert, SX Cavanaugh, D Cherdack, SR Childress, BC Choudhary, JAB Coelho, SJ Coleman, LA Corwin, DP Cronin-Hennessy, IZ Dankó, 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, RW Gran, NA Grant, K Grzelak, AT Habig, DA Harris, J Hartnell, RW Hatcher, AI Himmel, A Holin, XT Huang, JE Hylen, JV Ilić, GM Irwin, Z Isvan, DE Jaffe, CB James, DA Jensen, T Kafka, S Kasahara, G Koizumi, SE Kopp, M Kordosky, AE Kreymer, K Lang, G Lefeuvre, J Ling, PJ Litchfield, RP Litchfield, L Loiacono, PW Lucas, WA Mann, ML Marshak, N Mayer, AM McGowan, RR Mehdiyev, JR Meier, MD Messier, DG Michael, WH Miller, SR Mishra, J Mitchell, CD Moore, JG Morfín, L Mualem, SL Mufson, JA Musser, DL Naples, JK Nelson, HB Newman, RJ Nichol, JA Nowak, WP Oliver, M Orchanian, R Ospanov, JM Paley, RB Patterson, G Pawloski, GF Pearce, DA Petyt, S Phan-Budd, RK Plunkett, X Qiu, J Ratchford, TM Raufer, BJ Rebel, PAM Rodrigues, C Rosenfeld, HA Rubin, MC Sanchez, J Schneps, PA Schreiner, P Shanahan, CGA Smith, AB Sousa, P Stamoulis, M Strait, NJ Tagg, RL Talaga, JP Thomas, MA Thomson, G Tinti, R Toner, GS Tzanakos, J Urheim, PL Vahle, B Viren, A Weber, RC Webb, CG White, LH Whitehead, SG Wojcicki, T Yang, RM Zwaska

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) ×10-3eV2 for the atmospheric mass splitting and sin(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)

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, GD Barr, MJ Bass, F Bay, SW Bentham, V Berardi, BE Berger, IA Bertram, M Besnier, J Beucher, D Beznosko, S Bhadra, FDMM Blaszczyk, AP Blondel, C Bojechko, J Bouchez, SB Boyd, A Bravar, C Bronner, DG Brook-Roberge, NJ Buchanan, HS Budd, D Calvet, SL Cartwright, AG Carver, RC Castillo, MG Catanesi, A Cazes, A Cervera, CA Chavez, S Choi, G Christodoulou, JP Coleman, W Coleman, G Collazuol, K Connolly, A Curioni, A Da̧browska, IZ Dankó, RK Das, GS Davies, SP Davis, M Day, GD De Rosa, JPAM De André, P De Perio, A Delbart, CJ Densham, F Di Lodovico, S Di Luise, P Dinh Tran, J Dobson, U Dore, O Drapier, F Dufour, J Dumarchez, SA Dytman, M Dziewiecki, M Dziomba, S Emery, A Ereditato, L Escudero, LS Esposito, M Fechner, AMJ Ferrero, AJ Finch, E Frank, Y Fujii, Y Fukuda, V Galymov, FC Gannaway, A Gaudin, A Gendotti, MA George, S Giffin, C Giganti, K Gilje, T Golan, M Goldhaber, JJ Gómez-Cadenas, M Gonin, NA Grant, AK Grant, P Gumplinger, P Guzowski, A Haesler, MD Haigh, K Hamano, CJ Hansen, DC Hansen, T Hara, PF Harrison, BL Hartfiel, M Hartz, T Haruyama, T Hasegawa, NC Hastings, SP Hastings, A Hatzikoutelis, K Hayashi, Y Hayato, C Hearty, RL Helmer, RS Henderson, N Higashi, J Hignight, E Hirose, JM Holeczek, S Horikawa, A Hyndman, A Ichikawa, K Ieki, M Ieva, M Iida, M Ikeda, JV Ilić, J Imber, T Ishida, C Ishihara, T Ishii, SJ Ives, M Iwasaki, K Iyogi, AO Izmaylov, B Jamieson, RA Johnson, K Joo, GV Jover-Mañas, C Jung, H Kaji, T Kajita, H Kakuno, J Kameda, K Kaneyuki, D Karlen, K Kasami, I Kato, ET Kearns, MM Khabibullin, F Khanam, AN Khotjantsev, D Kiełczewska, T Kikawa, JE Kim, J Kim, SB Kim, N Kimura, BT Kirby, J Kisiel, PR Kitching, T Kobayashi, G Kogan, S Koike, A Konaka, LL Kormos, AN Korzenev, K Koseki, Y Koshio, Y Kouzuma, KL Kowalik, VI Kravtsov, IE Kreslo, WR Kropp, H Kubo, YGG Kudenko, NP Kulkarni, RP Kurjata, T Kutter, J Łagoda, K Laïhem, M Laveder, K Lee, PT Le, JM Lévy, C Licciardi, I Lim, T Lindner, RP Litchfield, M Litos, A Longhin, GD Lopez, PF Loverre, L Ludovici, T Lux, M Macaire, KBM Mahn, Y Makida, M Malek, SL Manly, A Marchionni, AD Marino, JE Marteau, JF Martin, T Maruyama, T Maryon, J Marzec, P Masliah, EL Mathie, C Matsumura, K Matsuoka, VA Matveev, K Mavrokoridis, E Mazzucato, N McCauley, KS McFarland, CE McGrew, T McLachlan, M Messina, WJ Metcalf, CJ Metelko, M Mezzetto, P Mijakowski, CA Miller, A Minamino, OV Mineev, S Mine, AD Missert, G Mituka, M Miura, K Mizouchi, L Monfregola, F Moreau, BE Morgan, S Moriyama, AM 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, DL Naples, ML Navin, BD 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, VS Paolone, P Paul, DJ Payne, GF Pearce, JD Perkin, V Pettinacci, FM Pierre, E Poplawska, BA Popov, MZ Posiadała, JM Poutissou, R Poutissou, P Przewłocki, W Qian, JL Raaf, E Radicioni, PN Ratoff, TM Raufer, M Ravonel, M Raymond, F Retière, A Robert, PAM Rodrigues, E Rondio, JM Roney, B Rossi, S Roth, A Rubbia, D Ruterbories, S Sabouri, R Sacco, K Sakashita, FJM Sánchez, A Sarrat, K Sasaki, K Scholberg, J Schwehr, MJ Scott, DI Scully, Y Seiya, T Sekiguchi, H Sekiya, M Shibata, Y Shimizu, M Shiozawa, SW Short, M Siyad, RJDA Smith, MB Smy, JT Sobczyk, HW Sobel, M Sorel, A Stahl, P Stamoulis, JL Steinmann, B Still, JL Stone, C Strabel, LR Sulak, R Sulej, PM Sutcliffe, A Suzuki, K Suzuki, S Suzuki, S Suzuki, Y Suzuki, Y Suzuki, T Szegłowski, M Szeptycka, R Tacik, M Tada, S Takahashi, A Takeda, Y Takenaga, Y Takeuchi, K Tanaka, HA Tanaka, M Tanaka, M Tanaka, N Tanimoto, K Tashiro, IJ 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, MR Vagins, G Vasseur, T Wa̧chała, JJ Walding, AV Waldron, CW Walter, PJ Wanderer, J Wang, MA Ward, GP Ward, DL Wark, MO Wascko, A Weber, RA Wendell, N West, LH Whitehead, G Wikström, J Wilkes, MJ Wilking, JR Wilson, RJ Wilson, TM Wongjirad, S Yamada, Y Yamada, A Yamamoto, K Yamamoto, Y Yamanoi, H Yamaoka, C Yanagisawa, T Yano, S Yen, NV 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 νμ→ν e 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⊃ 22θ23=1 and ⊃sin⊃ 22θ13=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⊃ 22θ13<0.28(0.34) for δCP= 0 and a normal (inverted) hierarchy.


The T2K near detector data acquisition systems

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

MJ Thorpe, C Angelsen, GD Barr, CJ Metelko, TC Nicholls, GF 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.


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


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, 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.


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


Observation in the MINOS far detector of the shadowing of cosmic rays by the sun and moon

Astroparticle Physics 34 (2011) 457-466

The shadowing of cosmic ray primaries by the moon and sun was observed by the MINOS far detector at a depth of 2070 mwe using 83.54 million cosmic ray muons accumulated over 1857.91 live-days. The shadow of the moon was detected at the 5.6 σ level and the shadow of the sun at the 3.8 σ level using a log-likelihood search in celestial coordinates. The moon shadow was used to quantify the absolute astrophysical pointing of the detector to be 0.17 ± 0.12°. Hints of interplanetary magnetic field effects were observed in both the sun and moon shadow. © 2010 Elsevier B.V. All rights reserved.


The T2K experiment

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

K Abe, N Abgrall, H Aihara, Y Ajima, JB Albert, DJ Allan, PA 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, GD Barr, LM Bartoszek, M Batkiewicz, F Bay, SW Bentham, V Berardi, BE Berger, HG Berns, IA Bertram, M Besnier, J Beucher, D Beznosko, S Bhadra, PS Birney, D Bishop, EWA Blackmore, FDMM Blaszczyk, JP Błocki, AP Blondel, A Bodek, C Bojechko, J Bouchez, T Boussuge, SB Boyd, MC Boyer, NA Braam, RK Bradford, A Bravar, K Briggs, JD Brinson, C Bronner, DG Brook-Roberge, ML Bryant, NJ Buchanan, HS Budd, M Cadabeschi, RG Calland, D Calvet, J Caravaca Rodríguez, JL Carroll, SL Cartwright, AG Carver, RC Castillo, MG Catanesi, C Cavata, A Cazes, A Cervera, JP Charrier, CA Chavez, S Choi, S Chollet, G Christodoulou, P Colas, JP Coleman, W Coleman, G Collazuol, K Connolly, PA Cooke, A Curioni, A Da̧browska, IZ Dankó, RK Das, GS Davies, SP Davis, M Day, X De La Broïse, P De Perio, GD De Rosa, T Dealtry, A Debraine, E Delagnes, A Delbart, CJ Densham, F Di Lodovico, S Di Luise, P Dinh Tran, J Dobson, J Doornbos, U Dore, O Drapier, F Druillole, F Dufour, J Dumarchez, TJ Durkin, SA Dytman, M Dziewiecki, M Dziomba, B Ellison, S Emery, A Ereditato, JE Escallier, L Escudero, LS Esposito, W Faszer, M Fechner, AMJ Ferrero, AJ Finch, CM Fisher, MD Fitton, RS Flight, DA Forbush, E Frank, KB Fransham, Y Fujii, Y Fukuda, M Gallop, V Galymov, GL Ganetis, FC Gannaway, A Gaudin, J Gaweda, A Gendotti, MA George, S Giffin, C Giganti, K Gilje, I Giomataris, JM Giraud, AK Ghosh, T Golan, M Goldhaber, JJ Gómez-Cadenas, S Gomi, M Gonin, M Goyette, AK Grant, NA Grant, F Grañena, S Greenwood, P Gumplinger, P Guzowski, MD Haigh, K Hamano, CJ Hansen, T Hara, PF Harrison, BL Hartfiel, M Hartz, T Haruyama, R Hasanen, T Hasegawa, NC Hastings, SP Hastings, A Hatzikoutelis, K Hayashi, Y Hayato, TDJ Haycock, C Hearty, RL Helmer, RS Henderson, S Herlant, N Higashi, J Hignight, K Hiraide, E Hirose, JM Holeczek, N Honkanen, S Horikawa, A Hyndman, A Ichikawa, K Ieki, M Ieva, M Iida, M Ikeda, JV Ilić, J Imber, T Ishida, C Ishihara, T Ishii, SJ Ives, M Iwasaki, K Iyogi, AO Izmaylov, B Jamieson, RA Johnson, K Joo, GV Jover-Mañas, C Jung, H Kaji, T Kajita, H Kakuno, J Kameda, K Kaneyuki, D Karlen, K Kasami, V Kasey, I Kato, H Kawamuko, ET Kearns, L Kellet, MM Khabibullin, MT Khaleeq, N Khan, AN Khotjantsev, D Kiełczewska, T Kikawa, J Kim, SB Kim, N Kimura, BJ Kirby, J Kisiel, PR Kitching, T Kobayashi, G Kogan, S Koike, T Komorowski, A Konaka, LL Kormos, AN Korzenev, K Koseki, Y Koshio, Y Kouzuma, KL Kowalik, VI Kravtsov, IE Kreslo, WR Kropp, H Kubo, J Kubota, YGG Kudenko, NP Kulkarni, LL Kurchaninov, Y Kurimoto, RP Kurjata, Y Kurosawa, T Kutter, J Łagoda, K Laïhem, RR Langstaff, M Laveder, TB Lawson, PT Le, A Le Coguie, M Le Ross, K Lee, M Lenckowski, C Licciardi, I Lim, T Lindner, RP Litchfield, A Longhin, GD Lopez, P Lu, L Ludovici, T Lux, M Macaire, L Magaletti, KBM Mahn, Y Makida, CJ Malafis, M Malek, SL Manly, A Marchionni, CR Mark, AD Marino, AJ Marone, JE Marteau, JF Martin, T Maruyama, T Maryon, J Marzec, P Masliah, EL Mathie, C Matsumura, K Matsuoka, VA Matveev, K Mavrokoridis, E Mazzucato, N McCauley, KS McFarland, CE McGrew, T McLachlan, IJ Mercer, M Messina, WJ Metcalf, CJ Metelko, M Mezzetto, P Mijakowski, CA Miller, A Minamino, OV Mineev, S Mine, RE Minvielle, G Mituka, M Miura, K Mizouchi, JP Mols, L Monfregola, E Monmarthe, F Moreau, BE Morgan, S Moriyama, GD Morris, AM 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, DL Naples, BD Nelson, TC Nicholls, K Nishikawa, H Nishino, K Nitta, FG 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, VS Paolone, P Paul, DJ Payne, GF Pearce, CJ Pearson, JD Perkin, M Pfleger, FM Pierre, D Pierrepont, P Płoński, PR Poffenberger, E Poplawska, BA Popov, MZ Posiadała, JM Poutissou, R Poutissou, RM Preece, P Przewłocki, W Qian, JL Raaf, E Radicioni, KJ Ramos, PN Ratoff, TM Raufer, M Ravonel, M Raymond, F Retière, DH Richards, JL Ritou, A Robert, PAM Rodrigues, E Rondio, M Roney, MR Rooney, D Ross, B Rossi, S Roth, A Rubbia, D Ruterbories, R Sacco, SW Sadler, K Sakashita, FJM Sánchez, A Sarrat, K Sasaki, P Schaack, JD Schmidt, K Scholberg, J Schwehr, MJ Scott, DI Scully, Y Seiya, T Sekiguchi, H Sekiya, G Sheffer, M Shibata, Y Shimizu, M Shiozawa, SW Short, M Siyad, DE Smith, RJDA Smith, MB Smy, JT Sobczyk, HW Sobel, S Sooriyakumaran, M Sorel, J Spitz, A Stahl, P Stamoulis, O Star, J Statter, L Stawnyczy, JL Steinmann, JL Steffens, B Still, M Stodulski, JL Stone, C Strabel, T Strauss, R Sulej, PM Sutcliffe, A Suzuki, K Suzuki, S Suzuki, S Suzuki, Y Suzuki, Y Suzuki, J Świerblewski, T Szegłowski, M Szeptycka, R Tacik, M Tada, AS Tadepalli, M Taguchi, S Takahashi, A Takeda, Y Takenaga, Y Takeuchi, HA Tanaka, K Tanaka, M Tanaka, M Tanaka, N Tanimoto, K Tashiro, IJ Taylor, A Terashima, D Terhorst, R Terri, LF Thompson, A Thorley, MJ Thorpe, W Toki, T Tomaru, Y Totsuka, C Touramanis, T Tsukamoto, V Tvaskis, M Tzanov, Y Uchida, K Ueno, M Usseglio, A Vacheret, MR Vagins, JF Van Schalkwyk, JC Vanel, G Vasseur, O Veledar, PJ Vincent, T Wa̧chała, AV Waldron, CW Walter, PJ Wanderer, MA Ward, GP Ward, DL Wark, DW Warner, MO Wascko, A Weber, RA Wendell, J Wendland, N West, LH Whitehead, G Wikström, J Wilkes, MJ Wilking, Z Williamson, JR Wilson, RJ Wilson, K Wong, TM Wongjirad, S Yamada, Y Yamada, A Yamamoto, K Yamamoto, Y Yamanoi, H Yamaoka, C Yanagisawa, T Yano, S Yen, NV 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 θ13 by observing νe appearance in a νμ beam. It also aims to make a precision measurement of the known oscillation parameters, Δ23 2+ and sin22θ23, via νμ 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 underground atmospheric muon charge ratio using the MINOS near detector

Physical Review D - Particles, Fields, Gravitation and Cosmology 83 (2011)

P Adamson, C Andreopoulos, DJ Auty, DS Ayres, CJ Backhouse, GD Barr, WL Barrett, P Bhattarai, MR Bishai, AST Blake, GJ Bock, DJ Boehnlein, DV Bogert, S Budd, SX Cavanaugh, D Cherdack, SR Childress, BC Choudhary, JAB Coelho, SJ Coleman, LA Corwin, DP Cronin-Hennessy, DS Damiani, IZ Dankó, JK De Jong, NE Devenish, MV Diwan, M Dorman, CO Escobar, JJ Evans, E Falk, GJ Feldman, TH Fields, MV Frohne, HR Gallagher, RA Gomes, MC Goodman, P Gouffon, N Graf, RW Gran, NA Grant, K Grzelak, AT Habig, DA Harris, PG Harris, J Hartnell, RW Hatcher, AI Himmel, A Holin, XT Huang, JE Hylen, JV Ilić, GM Irwin, Z Isvan, DE Jaffe, CB James, DA Jensen, T Kafka, S Kasahara, G Koizumi, SE Kopp, M Kordosky, Z Krahn, AE Kreymer, K Lang, G Lefeuvre, J Ling, PJ Litchfield, L Loiacono, PW Lucas, WA Mann, ML Marshak, N Mayer, AM McGowan, RR Mehdiyev, JR Meier, MD Messier, DG Michael, WH Miller, SR Mishra, J Mitchell, CD Moore, JG Morfín, L Mualem, SL Mufson, JA Musser, DL Naples, JK Nelson, HB Newman, RJ Nichol, JA Nowak, WP Oliver, M Orchanian, JM Paley, RB Patterson, G Pawloski, GF Pearce, R Pittam, RK Plunkett, X Qiu, J Ratchford, TM Raufer, BJ Rebel, J Reichenbacher, PAM Rodrigues, C Rosenfeld, HA Rubin, VA Ryabov, MC Sanchez, N Saoulidou, J Schneps, PA Schreiner, P Shanahan, AB Sousa, M Strait, NJ Tagg, RL Talaga, JP Thomas, MA Thomson, G Tinti, R Toner, GS Tzanakos, J Urheim, PL Vahle, B Viren, A Weber, RC Webb, CG White, LH Whitehead, SG Wojcicki, DM Wright, T Yang, RM Zwaska

The magnetized MINOS Near Detector, at a depth of 225 mwe, is used to measure the atmospheric muon charge ratio. The ratio of observed positive to negative atmospheric muon rates, using 301 days of data, is measured to be 1.266±0.001(stat)-0.014+0.015(syst). This measurement is consistent with previous results from other shallow underground detectors and is 0.108±0.019(stat+syst) lower than the measurement at the functionally identical MINOS Far Detector at a depth of 2070 mwe. This increase in charge ratio as a function of depth is consistent with an increase in the fraction of muons arising from kaon decay for increasing muon surface energies. © 2011 American Physical Society.


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.