Evidence for an Anomalous Like-Sign Dimuon Charge Asymmetry

V M Abazov,A L Lyon,A Lobodenko,N Parua,R Bernhard,B Tuchming,P Pétroff,G Blazey,R Yamada,D Schaile,B Spurlock,W M Van Leeuwen,B Calpas,J Guo,F Couderc,S B Beri,M A Carrasco-Lizarraga,R Magaña-Villalba,L S Ancu,D Khatidze,G D Alexeev,G Weber,P Verdier,T Ferbel,W Geng,M Pangilinan,M Perfilov,C P Buszello,D Tsybychev,P M Tuts,R Ruchti,P Rubinov,S M Lietti,B Hoeneisen,S Zelitch,H Yin,D Denisov,P Calfayan,A Bross,G Davies,J P Negret,T Gadfort,R Beuselinck,R Unalan,P Gay,T H Burnett,S W Youn,M Ćwiok,D Gillberg,A Juste,T Hebbeker,S Chevalier-Théry,L Sawyer,M Rominsky,J.-F Grivaz,V M Podstavkov,M Corcoran,J Warchol,Y Enari,Z Liu,S Blessing,G J Otero Y Garzón,A White,G Landsberg,O Atramentov,M Narain,G Watts,S Jabeen,G Brooijmans,J Cammin,L Sonnenschein,G Grenier,L S Vertogradov,P Skubic,J A Benitez,M Wobisch,I Ripp-Baudot,D V Bandurin,J Piper,M Arov,B Sanghi,E M Gregores,G S Muanza,C L Mcgivern,V V Tokmenin,A Boehnlein,T R Wyatt,P Renkel,K Ranjan,S W Cho,J Meyer,C Schwanenberger,M Buehler,S Yacoob,S Burdin,M Demarteau,R D Schamberger,G Chen,M Abolins,S Schlobohm,V Shary,P Houben,U Heintz,K Herner,P N Ratoff,J Linnemann,M Diesburg,K M Chan,R Van Kooten,P Svoisky,V D Elvira,J Qian,G Facini,V L Malyshev,W Fisher,K De,B S Acharya,V Sirotenko,D Price,S Desai,S Eno,M Verzocchi,H E Fisk,P Lebrun,F Guo,R Hirosky,M Hohlfeld,U Bassler,G Bernardi,H D Yoo,T Scanlon,T Nunnemann,J M Kohli,D Jamin,P Haefner,Y N Kharzheev,A Evdokimov,F Filthaut,G R Snow,H Severini,I Hall,Y Hu,T Moulik,D Strom,D Menezes,V V Lipaev,E Carrera,G Safronov,M Rijssenbeek,R Ströhmer,V Hynek,A Dominguez,A Harel,I Razumov,C Tully,A Grohsjean,S Cihangir,S Chakrabarti,B Tiller,S Lammers,M Vesterinen,S P Denisov,Ph Gris,P G Mercadante,R Jesik,G Sajot,T Dorland,T Kurča,H Schellman,Z Ye,S Choi,B Abbott,D Smirnov,T Hoang,R Lipton,S Beale,Y Peters,S Hossain,M Wetstein,R Schwienhorst,G Alkhazov,D Edmunds,D Boline,P Vint,K Kaadze,J M Hauptman,P C Bhat,Y Maravin,A Melnitchouk,V Buescher,W Taylor,T Schliephake,V Parihar,A Askew,A Croc,M Owen,A Brandt,J Stark,P Neustroev,V Stolin,S Uzunyan,J Orduna,T Christoudias,D Hedin,F Déliot,P D Grannis,B Penning,H Nilsen,A Meyer,K Devaughan,D Vilanova,J Kvita,V Bhatnagar,H A Neal,A Khanov,J Hays,B Quinn,R Kehoe,T Bose,B Baldin,E W Varnes,D Wicke,A Bean,J Lellouch,H T Diehl,K Harder,I A Vasilyev,M Prewitt,E Barberis,N Varelas,D Gerbaudo,T Zhao,T Adams,M Mulhearn,M Strauss,S Snyder,S Hagopian,A Sánchez-Hernández,J Yu,M S Rangel,S Uvarov,J Osta,S Grünendahl,M Merkin,H Fox,J Backusmayes,D A Stoyanova,M Wayne,M Aoki,R K Shivpuri,S Dutt,B Zhou,K Yip,L Stutte,M H L S Wang,D Lincoln,D Johnston,A A Shchukin,M P Sanders,M Cooke,J Clutter,S Calvet,W Geist,M Padilla,V A Kuzmin,I Iashvili,C Royon,G Alverson,A Kharchilava,N Khalatyan,D Brown,G Borissov,Z D Greenwood,C E Gerber,I Katsanos,E Shabalina,M Besançon,D Duggan,J Snow,A Duperrin,H S Lee,A Haas,Y Xie,Y Arnoud,M Eads,K Peters,A V Kozelov,N Huske,S Greder,E De La Cruz-Burelo,Y A Yatsunenko,Y Gershtein,S Banerjee,E Strauss,P A Kasper,H Greenlee,P Polozov,E Kajfasz,J Sekaric,M M Meijer,F Badaud,B Åsman,J F Bartlett,Q Z Li,W M Lee,M Weber,A Jonckheere,V Bunichev,D Mackin,P Baringer,V A Bezzubov,D Onoprienko,Y Liu,S Protopopescu,G Ginther,L Bagby,S.-J Park,F Fiedler,A Dyshkant,M Begalli,M Sosebee,R Piegaia,M Naimuddin,R Madar,J Kraus,D Karmanov,J Haley,G Obrant,S Malik,L Li,A Quadt,J Ellison,M Takahashi,R Brock,F Rizatdinova,I Heredia-De La Cruz,L Uvarov,T Yasuda,R Illingworth,D Chakraborty,M Titov,G A Alves,M Jaffré,V Gavrilov,W E Cooper,E Nagy,P Slattery,N Osman,N Parashar,P Rich,E Camacho-Pérez,S Fuess,G Petrillo,S Söldner-Rembold,M Fortner,J Martínez-Ortega,R Partridge,G Golovanov,A S Ito,M Begel,S J De Jong,A Alton,L Bellantoni,J Barreto,S K Park,H D Wahl,D Buchholz,A P Heinson,A Dubey,A Sopczak,A Patwa,C Hensel,K Bloom,R Nayyar,G Savage,H J Lubatti,N K Mondal,X B Bu,Y Scheglov,J Zhu,S Kermiche,G W Wilson,D K Cho,A Popov ,M A Pleier ,P Mal ,P Vokáč ,Han Liu ,T Bolton ,Z Hubáček ,Carrie L Johnson ,P Gutiérrez ,D Ziemińska ,A G Goussiou ,Matthias Kirsch ,E Boos ,J A Parsons ,Sergio F Novaes ,I A Bertram ,M Hildreth ,M Kirby ,P L.m Podesta-Lerma ,H Castilla‐Valdez ,M Williams ,R Démina ,J Hobbs ,A Kupčo ,Sh Jain ,D R Claes ,B C Choudhary ,A Ferapontov ,M E Pol ,A K.a Maciel ,E Aguiló ,Mark D Johnson ,C Ávila ,K Soustružnı́k ,W C Yang ,Ashok Kumar ,Anuj Chandra ,A F Barfuss ,L Dudko ,В Н Евдокимов ,V Šimák ,P Jönsson ,M R Adams ,K A Johns ,C Bélanger-Champagne ,D Ćutts ,C J Xu ,M Grünewald ,Ashok Das ,P A Love ,D Wood ,A J Tanasijczuk ,M Strang ,R L Mccarthy ,B C.k Casey ,R Luna-García ,G Gutiérrez ,A García-Bellido ,H M Evans ,M C Cousinou ,M Lokajı́ček ,S Wimpenny ,G G Hesketh ,Jaehoon Lim ,M Zieliński ,L Živković

doi:10.1103/physrevlett.105.081801

Abstract

We measure the charge asymmetry A ≡ (N++ - N--)/(N++ + N--) of like-sign dimuon events in 6.1 fb-1 of pp collisions recorded with the D0 detector at a center-of-mass energy square root(s) = 1.96 TeV at the Fermilab Tevatron collider. From A we extract the like-sign dimuon charge asymmetry in semileptonic b-hadron decays: A(sl)(b) = -0.009 57 ± 0.002 51(stat) ± 0.001 46(sys). It differs by 3.2 standard deviations from the standard model prediction A(sl)(b)(SM) = (-2.3(-0.6)(+0.5)) × 10(-4), and provides first evidence of anomalous CP violation in the mixing of neutral B mesons.

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