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Phys Rev Lett. 2016 May 6;116(18):181801. doi: 10.1103/PhysRevLett.116.181801. Epub 2016 May 5.

Measurement of Muon Antineutrino Oscillations with an Accelerator-Produced Off-Axis Beam.

Abe K1, Andreopoulos C2,3, Antonova M4, Aoki S5, Ariga A6, Assylbekov S7, Autiero D8, Barbi M9, Barker GJ10, Barr G11, Bartet-Friburg P12, Batkiewicz M13, Bay F14, Berardi V15, Berkman S16, Bhadra S17, Blondel A18, Bolognesi S19, Bordoni S20, Boyd SB10, Brailsford D21,22, Bravar A18, Bronner C23, Buizza Avanzini M24, Calland RG23, Cao S25, Caravaca Rodríguez J20, Cartwright SL26, Castillo R20, Catanesi MG15, Cervera A27, Cherdack D7, Chikuma N28, Christodoulou G2, Clifton A7, Coleman J2, Collazuol G29, Cremonesi L30, Dabrowska A13, De Rosa G31, Dealtry T22, Denner PF10, Dennis SR2, Densham C3, Dewhurst D11, Di Lodovico F30, Di Luise S14, Dolan S11, Drapier O24, Duffy KE11, Dumarchez J12, Dytman S32, Dziewiecki M33, Emery-Schrenk S19, Ereditato A6, Feusels T16, Finch AJ22, Fiorentini GA17, Friend M34, Fujii Y34, Fukuda D35, Fukuda Y36, Furmanski AP10, Galymov V8, Garcia A20, Giffin SG9, Giganti C12, Gizzarelli F19, Gonin M24, Grant N22, Hadley DR10, Haegel L18, Haigh MD10, Hamilton P21, Hansen D32, Hara T5, Hartz M23,37, Hasegawa T34, Hastings NC9, Hayashino T25, Hayato Y23,1, Helmer RL37, Hierholzer M6, Hillairet A38, Himmel A39, Hiraki T25, Hirota S25, Hogan M7, Holeczek J40, Horikawa S14, Hosomi F28, Huang K25, Ichikawa AK25, Ieki K25, Ikeda M1, Imber J24, Insler J41, Intonti RA15, Irvine TJ42, Ishida T34, Ishii T34, Iwai E34, Iwamoto K43, Izmaylov A27,4, Jacob A11, Jamieson B44, Jiang M25, Johnson S45, Jo JH46, Jonsson P21, Jung CK46, Kabirnezhad M47, Kaboth AC48,3, Kajita T42, Kakuno H49, Kameda J1, Karlen D37,38, Karpikov I4, Katori T30, Kearns E50,23, Khabibullin M4, Khotjantsev A4, Kielczewska D51, Kikawa T25, Kim H52, Kim J16, King S30, Kisiel J40, Knight A10, Knox A22, Kobayashi T34, Koch L53, Koga T28, Konaka A37, Kondo K25, Kopylov A4, Kormos LL22, Korzenev A18, Koshio Y35, Kropp W54, Kudenko Y4, Kurjata R33, Kutter T41, Lagoda J47, Lamont I22, Larkin E10, Laveder M29, Lawe M22, Lazos M2, Lindner T37, Liptak ZJ45, Litchfield RP10, Li X46, Longhin A29, Lopez JP45, Ludovici L55, Lu X11, Magaletti L15, Mahn K56, Malek M26, Manly S43, Marino AD45, Marteau J8, Martin JF57, Martins P30, Martynenko S46, Maruyama T34, Matveev V4, Mavrokoridis K2, Ma WY21, Mazzucato E19, McCarthy M17, McCauley N2, McFarland KS43, McGrew C46, Mefodiev A4, Mezzetto M29, Mijakowski P47, Minamino A25, Mineev O4, Mine S54, Missert A45, Miura M1, Moriyama S1, Mueller TA24, Murphy S14, Myslik J38, Nakadaira T34, Nakahata M23,1, Nakamura KG25, Nakamura K34,23, Nakamura KD25, Nakayama S1, Nakaya T23,25, Nakayoshi K34, Nantais C16, Nielsen C16, Nirkko M6, Nishikawa K34, Nishimura Y42, Nowak J22, O'Keeffe HM22, Ohta R34, Okumura K23,42, Okusawa T52, Oryszczak W51, Oser SM16, Ovsyannikova T4, Owen RA30, Oyama Y34, Palladino V31, Palomino JL46, Paolone V32, Patel ND25, Pavin M12, Payne D2, Perkin JD26, Petrov Y16, Pickard L26, Pickering L21, Pinzon Guerra ES17, Pistillo C6, Popov B12, Posiadala-Zezula M51, Poutissou JM37, Poutissou R37, Przewlocki P47, Quilain B25, Radicioni E15, Ratoff PN22, Ravonel M18, Rayner MA18, Redij A6, Reinherz-Aronis E7, Riccio C31, Rojas P7, Rondio E47, Roth S53, Rubbia A14, Rychter A33, Sacco R30, Sakashita K34, Sánchez F20, Sato F34, Scantamburlo E18, Scholberg K39, Schoppmann S53, Schwehr J7, Scott M37, Seiya Y52, Sekiguchi T34, Sekiya H23,1, Sgalaberna D14, Shah R11,3, Shaikhiev A4, Shaker F44, Shaw D22, Shiozawa M23,1, Shirahige T35, Short S30, Smy M54, Sobczyk JT58, Sorel M27, Southwell L22, Stamoulis P27, Steinmann J53, Stewart T3, Suda Y28, Suvorov S4, Suzuki A5, Suzuki K25, Suzuki SY34, Suzuki Y23, Tacik R9,37, Tada M34, Takahashi S25, Takeda A1, Takeuchi Y23,5, Tanaka HK1, Tanaka HA57,37, Terhorst D53, Terri R30, Thakore T41, Thompson LF26, Tobayama S16, Toki W7, Tomura T1, Touramanis C2, Tsukamoto T34, Tzanov M41, Uchida Y21, Vacheret A11, Vagins M54,23, Vallari Z46, Vasseur G19, Wachala T13, Wakamatsu K52, Walter CW39, Wark D11,3, Warzycha W51, Wascko MO34,21, Weber A11,3, Wendell R25, Wilkes RJ59, Wilking MJ46, Wilkinson C6, Wilson JR30, Wilson RJ7, Yamada Y34, Yamamoto K52, Yamamoto M25, Yanagisawa C46, Yano T5, Yen S37, Yershov N4, Yokoyama M28, Yoo J41, Yoshida K25, Yuan T45, Yu M17, Zalewska A13, Zalipska J47, Zambelli L34, Zaremba K33, Ziembicki M33, Zimmerman ED45, Zito M19, Żmuda J58; T2K Collaboration.

Author information

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

Abstract

T2K reports its first measurements of the parameters governing the disappearance of ν[over ¯]_{μ} in an off-axis beam due to flavor change induced by neutrino oscillations. The quasimonochromatic ν[over ¯]_{μ} beam, produced with a peak energy of 0.6 GeV at J-PARC, is observed at the far detector Super-Kamiokande, 295 km away, where the ν[over ¯]_{μ} survival probability is expected to be minimal. Using a data set corresponding to 4.01×10^{20} protons on target, 34 fully contained μ-like events were observed. The best-fit oscillation parameters are sin^{2}(θ[over ¯]_{23})=0.45 and |Δm[over ¯]_{32}^{2}|=2.51×10^{-3}  eV^{2} with 68% confidence intervals of 0.38-0.64 and 2.26-2.80×10^{-3}  eV^{2}, respectively. These results are in agreement with existing antineutrino parameter measurements and also with the ν_{μ} disappearance parameters measured by T2K.

PMID:
27203315
DOI:
10.1103/PhysRevLett.116.181801
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