Evidence of electron neutrino appearance in a muon neutrino beam

Kou Abe,N Abgrall,H Aihara,T Akiri,JB Albert,C Andreopoulos,S Aoki,A Ariga,T Ariga,S Assylbekov,D Autiero,M Barbi,GJ Barker,G Barr,M Bass,M Batkiewicz,F Bay,SW Bentham,V Berardi,BE Berger,S Berkman,I Bertram,D Beznosko,S Bhadra,F d M Blaszczyk,A Blondel,C Bojechko,S Boyd,D Brailsford,A Bravar,C Bronner,DG Brook-Roberge,N Buchanan,RG Calland,J Caravaca Rodríguez,SL Cartwright,R Castillo,MG Catanesi,A Cervera,D Cherdack,G Christodoulou,A Clifton,J Coleman,SJ Coleman,G Collazuol,K Connolly,L Cremonesi,A Curioni,A Dabrowska,I Danko,R Das,S Davis,M Day,JPAM De André,P De Perio,G De Rosa,T Dealtry,S Dennis,C Densham,F Di Lodovico,S Di Luise,J Dobson,O Drapier,T Duboyski,F Dufour,J Dumarchez,S Dytman,M Dziewiecki,M Dziomba,S Emery,A Ereditato,L Escudero,AJ Finch,E Frank,M Friend,Y Fujii,Y Fukuda, A Furmanski,V Galymov,A Gaudin,S Giffin,C Giganti,K Gilje,T Golan,JJ Gomez-Cadenas,M Gonin,N Grant,D Gudin,DR Hadley,A Haesler,MD Haigh,P Hamilton,D Hansen,T Hara,M Hartz,T Hasegawa,NC Hastings,Y Hayato,C Hearty,RL Helmer,M Hierholzer,J Hignight,A Hillairet,A Himmel,T Hiraki,S Hirota,J Holeczek,S Horikawa,K Huang,AK Ichikawa,K Ieki,M Ieva,M Ikeda,J Imber,J Insler,TJ Irvine,T Ishida,T Ishii,SJ Ives,K Iyogi,A Izmaylov,A Jacob,B Jamieson,RA Johnson,JH Jo,P Jonsson,KK Joo,CK Jung,A Kaboth,H Kaji,T Kajita,H Kakuno,J Kameda,Y Kanazawa,D Karlen,I Karpikov,E Kearns,M Khabibullin,F Khanam,A Khotjantsev,D Kielczewska,T Kikawa,A Kilinski,JY Kim,J Kim,SB Kim,B Kirby,J Kisiel,P Kitching,T Kobayashi

Physical Review D（2013）

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摘要

The T2K Collaboration reports evidence for electron neutrino appearance at the atmospheric mass splitting, vertical bar Delta m(32)(2)vertical bar approximate to 2.4 X 10(-3) eV(2). An excess of electron neutrino interactions over background is observed from a muon neutrino beam with a peak energy of 0.6 GeV at the Super-Kamiokande (SK) detector 295 km from the beam's origin. Signal and background predictions are constrained by data from near detectors located 280 m from the neutrino production target. We observe 11 electron neutrino candidate events at the SK detector when a background of 3.3 +/- 0.4(syst) events is expected. The background-only hypothesis is rejected with a p value of 0.0009 (3.1 sigma), and a fit assuming nu(mu) -> nu(e) oscillations with sin (2)2 theta(23) = 1, delta(CP) = 0 and vertical bar Delta m(32)(2)vertical bar = 2.4 X 10(-3) eV(2) yields sin (2)2 theta(13) = 0.088(-0.039)(+0.049)(stat + syst).

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background,neutrino oscillation

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