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Phys Rev Lett. 2017 Apr 14;118(15):151801. doi: 10.1103/PhysRevLett.118.151801. Epub 2017 Apr 10.

Combined Analysis of Neutrino and Antineutrino Oscillations at T2K.

Abe K1, Amey J2, Andreopoulos C3,4, Antonova M5, Aoki S6, Ariga A7, Autiero D8, Ban S9, Barbi M10, Barker GJ11, Barr G12, Barry C3, Bartet-Friburg P13, Batkiewicz M14, Berardi V15, Berkman S16,17, Bhadra S18, Bienstock S13, Blondel A19, Bolognesi S20, Bordoni S21, Boyd SB11, Brailsford D22, Bravar A19, Bronner C23, Buizza Avanzini M24, Calland RG23, Campbell T25, Cao S26, Cartwright SL27, Catanesi MG15, Cervera A28, Checchia C29, Cherdack D25, Chikuma N30, Christodoulou G3, Clifton A25, Coleman J3, Collazuol G29, Coplowe D12, Cudd A31, Dabrowska A14, De Rosa G32, Dealtry T22, Denner PF11, Dennis SR3, Densham C4, Dewhurst D12, Di Lodovico F33, Di Luise S34, Dolan S12, Drapier O24, Duffy KE12, Dumarchez J13, Dziewiecki M35, Emery-Schrenk S20, Ereditato A7, Feusels T16,17, Finch AJ22, Fiorentini GA18, Friend M26, Fujii Y26, Fukuda D36, Fukuda Y37, Galymov V8, Garcia A21, Giganti C13, Gizzarelli F20, Golan T38, Gonin M24, Hadley DR11, Haegel L19, Haigh MD11, Hansen D39, Harada J40, Hartz M23,17, Hasegawa T26, Hastings NC10, Hayashino T9, Hayato Y23,1, Helmer RL17, Hillairet A41, Hiraki T9, Hiramoto A9, Hirota S9, Hogan M25, Holeczek J42, Hosomi F30, Huang K9, Ichikawa AK9, Ikeda M1, Imber J24, Insler J43, Intonti RA15, Ishida T26, Ishii T26, Iwai E26, Iwamoto K44, Izmaylov A28,5, Jamieson B45, Jiang M9, Johnson S46, Jonsson P2, Jung CK47, Kabirnezhad M48, Kaboth AC49,4, Kajita T50, Kakuno H51, Kameda J1, Karlen D17,41, Katori T33, Kearns E52,23, Khabibullin M5, Khotjantsev A5, Kim H40, Kim J16,17, King S33, Kisiel J42, Knight A11, Knox A22, Kobayashi T26, Koch L53, Koga T30, Konaka A17, Kondo K9, Kormos LL22, Korzenev A19, Koshio Y36, Kowalik K48, Kropp W54, Kudenko Y5, Kurjata R35, Kutter T43, Lagoda J48, Lamont I22, Lamoureux M20, Larkin E11, Lasorak P33, Laveder M29, Lawe M22, Licciardi M24, Lindner T17, Liptak ZJ46, Litchfield RP2, Li X47, Longhin A29, Lopez JP46, Lou T30, Ludovici L55, Lu X12, Magaletti L15, Mahn K31, Malek M27, Manly S44, Marino AD46, Martin JF56, Martins P33, Martynenko S47, Maruyama T26, Matveev V5, Mavrokoridis K3, Ma WY2, Mazzucato E20, McCarthy M18, McCauley N3, McFarland KS44, McGrew C47, Mefodiev A5, Metelko C3, Mezzetto M29, Mijakowski P48, Minamino A57, Mineev O5, Mine S54, Missert A46, Miura M1, Moriyama S1, Mueller TA24, Myslik J41, Nakadaira T26, Nakahata M23,1, Nakamura KG9, Nakamura K26,23, Nakamura KD9, Nakanishi Y9, Nakayama S1, Nakaya T23,9, Nakayoshi K26, Nantais C56, Nielsen C16, Nirkko M7, Nishikawa K26, Nishimura Y50, Novella P28, Nowak J22, O'Keeffe HM22, Okumura K23,50, Okusawa T40, Oryszczak W58, Oser SM16,17, Ovsyannikova T5, Owen RA33, Oyama Y26, Palladino V32, Palomino JL47, Paolone V39, Patel ND9, Paudyal P3, Pavin M13, Payne D3, Perkin JD27, Petrov Y16,17, Pickard L27, Pickering L2, Pinzon Guerra ES18, Pistillo C7, Popov B13, Posiadala-Zezula M58, Poutissou JM17, Poutissou R17, Przewlocki P48, Quilain B9, Radermacher T53, Radicioni E15, Ratoff PN22, Ravonel M19, Rayner MA19, Redij A7, Reinherz-Aronis E25, Riccio C32, Rodrigues PA44, Rondio E48, Rossi B32, Roth S53, Rubbia A34, Rychter A35, Sakashita K26, Sánchez F21, Scantamburlo E19, Scholberg K59, Schwehr J25, Scott M17, Seiya Y40, Sekiguchi T26, Sekiya H23,1, Sgalaberna D19, Shah R12,4, Shaikhiev A5, Shaker F45, Shaw D22, Shiozawa M23,1, Shirahige T36, Short S33, Smy M54, Sobczyk JT38, Sobel H54,23, Sorel M28, Southwell L22, Steinmann J53, Stewart T4, Stowell P27, Suda Y30, Suvorov S5, Suzuki A6, Suzuki SY26, Suzuki Y23, Tacik R10,17, Tada M26, Takeda A1, Takeuchi Y23,6, Tanaka HK1, Tanaka HA56,17, Terhorst D53, Terri R33, Thakore T43, Thompson LF27, Tobayama S16,17, Toki W25, Tomura T1, Touramanis C3, Tsukamoto T26, Tzanov M43, Uchida Y2, Vagins M54,23, Vallari Z47, Vasseur G20, Vladisavljevic T23,12, Wachala T14, Walter CW59, Wark D12,4, Wascko MO26,2, Weber A12,4, Wendell R9, Wilkes RJ60, Wilking MJ47, Wilkinson C7, Wilson JR33, Wilson RJ25, Wret C2, Yamada Y26, Yamamoto K40, Yamamoto M9, Yanagisawa C47, Yano T6, Yen S17, Yershov N5, Yokoyama M30, Yoshida K9, Yuan T46, Yu M18, Zalewska A14, Zalipska J48, Zambelli L26, Zaremba K35, Ziembicki M35, Zimmerman ED46, Zito M20, Żmuda J38; T2K Collaboration.

Author information

1
Institute for Cosmic Ray Research, Kamioka Observatory, University of Tokyo, Kamioka, Japan.
2
Department of Physics, Imperial College London, London, United Kingdom.
3
Department of Physics, University of Liverpool, Liverpool, United Kingdom.
4
STFC, Rutherford Appleton Laboratory, Harwell Oxford, United Kingdom and Daresbury Laboratory, Warrington, United Kingdom.
5
Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia.
6
Kobe University, Kobe, Japan.
7
Albert Einstein Center for Fundamental Physics, Laboratory for High Energy Physics (LHEP), University of Bern, Bern, Switzerland.
8
Université de Lyon, Université Claude Bernard Lyon 1, IPN Lyon (IN2P3), Villeurbanne, France.
9
Department of Physics, Kyoto University, Kyoto, Japan.
10
Department of Physics, University of Regina, Regina, Saskatchewan, Canada.
11
Department of Physics, University of Warwick, Coventry, United Kingdom.
12
Department of Physics, Oxford University, Oxford, United Kingdom.
13
Laboratoire de Physique Nucléaire et de Hautes Energies (LPNHE), UPMC, Université Paris Diderot, CNRS/IN2P3, Paris, France.
14
H. Niewodniczanski Institute of Nuclear Physics PAN, Cracow, Poland.
15
INFN Sezione di Bari and Dipartimento Interuniversitario di Fisica, Università e Politecnico di Bari, Bari, Italy.
16
Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada.
17
TRIUMF, Vancouver, British Columbia, Canada.
18
Department of Physics and Astronomy, York University, Toronto, Ontario, Canada.
19
Section de Physique, DPNC, University of Geneva, Geneva, Switzerland.
20
IRFU, CEA Saclay, Gif-sur-Yvette, France.
21
Institut de Fisica d'Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra (Barcelona), Spain.
22
Physics Department, Lancaster University, Lancaster, United Kingdom.
23
Kavli Institute for the Physics and Mathematics of the Universe (WPI), University of Tokyo Institutes for Advanced Study, University of Tokyo, Kashiwa, Chiba, Japan.
24
Ecole Polytechnique, IN2P3-CNRS, Laboratoire Leprince-Ringuet, Palaiseau, France.
25
Department of Physics, Colorado State University, Fort Collins, Colorado, USA.
26
High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki, Japan.
27
Department of Physics and Astronomy, University of Sheffield, Sheffield, United Kingdom.
28
IFIC (CSIC and University of Valencia), Valencia, Spain.
29
INFN Sezione di Padova and Dipartimento di Fisica, Università di Padova, Padova, Italy.
30
Department of Physics, University of Tokyo, Tokyo, Japan.
31
Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan, USA.
32
INFN Sezione di Napoli and Dipartimento di Fisica, Università di Napoli, Napoli, Italy.
33
School of Physics and Astronomy, Queen Mary University of London, London, United Kingdom.
34
Institute for Particle Physics, ETH Zurich, Zurich, Switzerland.
35
Institute of Radioelectronics, Warsaw University of Technology, Warsaw, Poland.
36
Department of Physics, Okayama University, Okayama, Japan.
37
Department of Physics, Miyagi University of Education, Sendai, Japan.
38
Faculty of Physics and Astronomy, Wroclaw University, Wroclaw, Poland.
39
Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.
40
Department of Physics, Osaka City University, Osaka, Japan.
41
Department of Physics and Astronomy, University of Victoria, Victoria, British Columbia, Canada.
42
Institute of Physics, University of Silesia, Katowice, Poland.
43
Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana, USA.
44
Department of Physics and Astronomy, University of Rochester, Rochester, New York, USA.
45
Department of Physics, University of Winnipeg, Winnipeg, Manitoba, Canada.
46
Department of Physics, University of Colorado at Boulder, Boulder, Colorado, USA.
47
Department of Physics and Astronomy, State University of New York at Stony Brook, Stony Brook, New York, USA.
48
National Centre for Nuclear Research, Warsaw, Poland.
49
Department of Physics, Royal Holloway University of London, Egham, Surrey, United Kingdom.
50
Institute for Cosmic Ray Research, Research Center for Cosmic Neutrinos, University of Tokyo, Kashiwa, Japan.
51
Department of Physics, Tokyo Metropolitan University, Tokyo, Japan.
52
Department of Physics, Boston University, Boston, Massachusetts, USA.
53
III. Physikalisches Institut, RWTH Aachen University, Aachen, Germany.
54
Department of Physics and Astronomy, University of California, Irvine, Irvine, California, USA.
55
INFN Sezione di Roma and Università di Roma "La Sapienza," Roma, Italy.
56
Department of Physics, University of Toronto, Toronto, Ontario, Canada.
57
Faculty of Engineering, Yokohama National University, Yokohama, Japan.
58
Faculty of Physics, University of Warsaw, Warsaw, Poland.
59
Department of Physics, Duke University, Durham, North Carolina, USA.
60
Department of Physics, University of Washington, Seattle, Washington, USA.

Abstract

T2K reports its first results in the search for CP violation in neutrino oscillations using appearance and disappearance channels for neutrino- and antineutrino-mode beams. The data include all runs from January 2010 to May 2016 and comprise 7.482×10^{20} protons on target in neutrino mode, which yielded in the far detector 32 e-like and 135  μ-like events, and 7.471×10^{20} protons on target in antineutrino mode, which yielded 4 e-like and 66  μ-like events. Reactor measurements of sin^{2}2θ_{13} have been used as an additional constraint. The one-dimensional confidence interval at 90% for the phase δ_{CP} spans the range (-3.13, -0.39) for normal mass ordering. The CP conservation hypothesis (δ_{CP}=0, π) is excluded at 90% C.L.

PMID:
28452532
DOI:
10.1103/PhysRevLett.118.151801
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