Precise measurement of the neutrino mixing parameter θ23 from muon neutrino disappearance in an off-axis beam.

K Abe,C Giganti,R Ohta,D Gudin,A Suzuki,T Maruyama,E Poplawska,L Southwell,T Wongjirad,C Yanagisawa,G De Rosa,E Radicioni,A Longhin,M Mezzetto,P Kitching,S Manly,B Quilain,T Kikawa,S Emery,A Thorley,L Ludovici,K Suzuki,C Densham,M Kabirnezhad,Y Petrov,E Scantamburlo,T Nakadaira,J Myslik,L Zambelli,M Lazos,T Hara,C Mcgrew,M Tzanov,T Hasegawa,S Kumaratunga,L Pickard,Y Fukuda,K Iyogi,A Himmel,A Blondel,C Pistillo,N Mccauley,K Nakayoshi,A Hillairet,O Drapier,T Golan,C Bronner,D Ruterbories,S Mine,K Ueno,M Gonin,A Haesler,R Poutissou,W Oryszczak,S Di Luise,N Yershov,Y Takeuchi,E Rondio,V Galymov,L Magaletti,T Lindner,A Missert,J Schwehr,A Kolaceke,M Zito,T Dealtry,I Kreslo,F Di Lodovico,C Hearty,R Terri,M Lawe,P Mijakowski,K Koseki,S Bhadra,E Mazzucato,R Sacco,Z Williamson,L Cremonesi,A Korzenev,K Gilje,C Andreopoulos,S Bordoni,D Cherdack,T Tsukamoto,S Berkman,A Bravar,D Autiero,M Hartz,K Huang,L Floetotto,Y Hayato,M Batkiewicz,E Iwai,M Nirkko,B Jamieson,K Nakamura,J Dumarchez,G Collazuol,M Ziembicki,A Clifton,T Kutter,M Bass,S Tobayama,C Bojechko,S Murphy,C Touramanis,A Konaka,M Murdoch,I Karpikov,J Marteau,A Cervera,K Mavrokoridis,A Izmaylov,B Still,T Tomura,J Insler,I Lamont,A Minamino,Y Totsuka,K Sakashita,R Tacik,S Moriyama,A Kilinski,L Monfregola,M Hierholzer,Y Shustrov,P Stamoulis,M Friend,V Paolone,S Yen,M Ravonel,J Holeczek,Y Uchida,K Connolly,G Christodoulou,E Kearns,D Terhorst,D Naples,K Nishikawa,T Akiri,J Imber,M Barbi,M Ieva,D Karlen,M Macaire,A Redij,D Brailsford,N Grant,T Okusawa,K Laihem,T Ishii,T Duboyski,H Kakuno,O Perevozchikov,F Bay,Y Seiya,L Escudero,S Horikawa,M Miura,D Goeldi,L Koch,G Vasseur,S Assylbekov,J Zalipska,P De Perio,J Adam,S Giffin,J Kisiel,S B Boyd ,M Rayner ,D Wark,Hirohisa Tanaka ,A Rubbia,S J Ives ,R P Litchfield ,Toru Ishida ,P Płoński ,T Ariga,M J Wilking ,W H Toki ,H Kubo,H M O’keeffe ,L L Kormos ,Y Suda,T Hiraki,R J Wilson ,F D M Blaszczyk ,F Retière ,C Lister,J F Martin ,L F Thompson ,Mark E Reeves ,S J Coleman ,Yoshihiro Suzuki ,J Marzec,H Aihara,M Ikeda,Shoji Suzuki ,Tianlu Yuan ,P N Ratoff ,P Jönsson ,M D Haigh ,Benjamin M Smith ,Toshio Kobayashi ,J Hignight,C K Jung ,Y Kanazawa,S W Bentham ,E D Zimmerman ,R J Smith ,Y Nishimura,D Hansen,O Mineev,M Nakahata,R J Wilkes ,S M Oser ,E Reinherz‐Aronis ,V Berardi,J T Sobczyk ,G Barr,K Duffy,R G Calland ,S Nakayama,A Vacheret,T Kajita,S Short,P Sinclair,S Dytman,R A Johnson ,Sentaro Takahashi ,M Posiadała ,R A Owen ,P A Rodrigues ,J Caravaca Rodríguez,C Wilkinson,Stefan Roth ,R L Helmer ,M Shiozawa,N J Buchanan ,S Schoppmann,J Kameda,C Nielsen,Th A Mueller ,K Yamamoto,Takanori Nagasaki ,R Kurjata,A Robert,T J Irvine ,T Nakaya,A Weber,P Hamilton,E L Mathie ,S L Cartwright ,K P Lee ,M R Vagins ,Shigeki Aoki ,Frédéric Dufour ,A J Finch ,Y Fujii,A V Waldron ,P Przewłocki ,A K Ichikawa ,T Sekiguchi,J D Perkin ,Akira Murakami ,M G Catanesi ,C Metelko,A C Kaboth ,Atsushi Takeda ,I Dankó ,E S Pinzon Guerra ,D J Payne ,D Sgalaberna,Jochen Steinmann ,Anu Jacob ,F Sánchez,A Dąbrowska ,V Matveev,R Castillo,M B Smy ,M Laveder,D R Hadley ,M Tada,M O Wascko ,K S Mcfarland ,H Tanaka ,J Żmuda,F Sato,J H Jo ,C A Miller ,Б Popov ,A Ereditato,Y Kudenko,M Yokoyama,M Mccarthy,H Sekiya,A Ariga,S Hirota,A Khotjantsev,T Szegłowski ,K Scholberg,A P Furmanski ,M Dziewiecki,W R Kropp ,D Kiełczewska ,Y Oyama,H W Sobel ,V Palladino,R Wendell,M Khabibullin,A Zalewska,T Nakai,J Łagoda ,J L Palomino ,C W Walter ,M Sorel,T Wąchała ,M Malek,A D Marino ,Y Koshio,Rajarshi Das ,G J Barker ,Kendall Mahn ,K Ieki,К Заремба ,J R Wilson ,Stephen C Davis ,J Kim,M Scott,J M Poutissou ,M Tanaka ,I A Bertram ,J P Coleman ,M Yu,S R Dennis ,Pablo Fierro Rojas ,N C Hastings ,Y Yamada,B E Berger ,K Okumura

doi:10.1103/physrevlett.112.181801

Abstract

New data from the T2K neutrino oscillation experiment produce the most precise measurement of the neutrino mixing parameter θ23. Using an off-axis neutrino beam with a peak energy of 0.6 GeV and a data set corresponding to 6.57×10(20) protons on target, T2K has fit the energy-dependent νμ oscillation probability to determine oscillation parameters. The 68% confidence limit on sin(2)(θ23) is 0.514(-0.056)(+0.055) (0.511±0.055), assuming normal (inverted) mass hierarchy. The best-fit mass-squared splitting for normal hierarchy is Δm32(2)=(2.51±0.10)×10(-3) eV(2)/c(4) (inverted hierarchy: Δm13(2)=(2.48±0.10)×10(-3) eV(2)/c(4)). Adding a model of multinucleon interactions that affect neutrino energy reconstruction is found to produce only small biases in neutrino oscillation parameter extraction at current levels of statistical uncertainty.

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