Measurement of the DirectCP-violating Charge Asymmetry inDs±→ϕπ±Decays

V M Abazov ,R Bernhard,W Geng,M Rominsky,I Razumov,A Patwa,D Hedin,L Bagby,S Kermiche,R Jesik,J Weichert,K Devaughan,T Nunnemann,G Savage,J Warchol,M Jaffré,I Howley,S Caughron,N Parua,B Hoeneisen,I Heredia-De La Cruz,H Greenlee,L Bellantoni,S Atkins,J Orduna,S Blessing,S Banerjee,M Diesburg,M Merkin,J Ellison,A Jayasinghe,F Badaud,P Svoisky,E Kajfasz,D Karmanov,T Yasuda,M Cooke,P Neustroev,S Yang,G Alkhazov,J Clutter,M Hohlfeld,R Beuselinck,G Sajot,G Ginther,J Zennamo,T Hoang,S Cihangir,H Hegab,I Katsanos,S Greder,W Ye,K Herner,J Martínez-Ortega,E De La Cruz-Burelo,B Quinn,M Eads,D Menezes,L Welty-Rieger,V Parihar,A Lobodenko,A Alton,K Yip,R Illingworth,E Johnson,A Boehnlein,R Madar,N Osman,A Melnitchouk,V Bunichev,Y Peters,R Van Kooten,S Chakrabarti,S Uzunyan,C Schwanenberger,A Jonckheere,A Meyer,Y Scheglov,S Fuess,V Hynek,B Baldin,T Scanlon,Y Ilchenko,R Partridge,T Head,V Shary,A Pal,D Edmunds,D Boline,U Bassler,G Grenier,S Söldner-Rembold,J Snow,J Osta,I Kiselevich,F Miconi,B Tuchming,D Smirnov,A Chandra,D Vilanova,M Buehler,E Camacho-Pérez,A Bross,P Lebrun,I Ripp-Baudot,N Khalatyan,R Yamada,J Sekaric,S Uvarov,G Golovanov,P Skubic,R Magaña-Villalba,M Prewitt,J Hays,M Vesterinen,M Fortner,P Rubinov,D Denisov,B Penning,H Schellman,C Deterre ,Y A Yatsunenko ,Z Hubáček ,M Grünewald ,E Barberis ,Z Ye ,R Hirosky ,W M Lee ,M S Jeong ,M R Adams ,M C Cousinou ,M Lokajı́ček ,J Joshi ,L Li ,C Ávila ,H A Neal ,K A Johns ,Michael Wang ,R Luna-García ,B C.k Casey ,W E Cooper ,M Narain ,J Kraus ,S Lammers ,R Nayyar ,C Royon ,J Meyer ,M Titov ,A Sánchez-Hernández ,Y T Tsai ,S P Denisov ,L Dudko ,N K Mondal ,P Slattery ,D Brown ,H Evans ,P C Bhat ,D A Stoyanova ,J Zhu ,A L Lyon ,M M Meijer ,E Nagy ,H Liu ,H S Lee ,G G Hesketh ,A Dubey ,J Yu ,K M Chan ,L Sawyer ,L Sonnenschein ,I A Bertram ,M Perfilov ,Q Z Li ,Feng Liu ,K Soustružnı́k ,C E Gerber ,H Nguyen ,P H Garbincius ,J D Mansour ,A P Heinson ,Y Liu ,A García-Bellido ,K Petridis ,J M Kohli ,V D Elvira ,G D Alexeev ,A Dominguez ,H T Diehl ,S Burdin ,Y N Kharzheev ,M Begalli ,D R Claes ,G Bernardi ,M Hildreth ,F Filthaut ,D Li ,D Ćutts ,Ashok Kumar ,N Parashar ,A S Ito ,J Qian ,S Snyder ,T Kurča ,A Harel ,A Askew ,V Šimák ,R Lopes De ,M Johnson ,Y Gershtein ,W C Fisher ,M Wayne ,G R Snow ,C L Mcgivern ,N Varelas ,A K.a Maciel ,A Juste Rozas ,R D Schamberger ,W M Van Leeuwen ,M A Pleier ,R Démina ,A Ross ,J P Negret ,U Heintz ,P N Ratoff ,B C Choudhary ,V A Kuzmin ,J Stark ,S W Youn ,N Prokopenko ,R Schwienhorst ,H Castilla‐Valdez ,K Harder ,A Khanov ,I Iashvili ,A Quadt ,S J De Jong ,G Blazey ,A V Kozelov ,J Haley ,A Kharchilava ,Andreas Werner Jung ,P Jönsson ,E Shabalina ,A S Santos ,J M Hauptman ,L Suter ,M Mulhearn ,L S Vertogradov ,V L Malyshev ,J P Agnew ,R Ruchti ,O Brandt ,V V Lipaev ,A Brandt ,S Bhatia ,M Verzocchi ,A A Shchukin ,A Grohsjean ,H Li ,T Adams ,T Guillemin ,K Bloom ,S W Cho ,P Gutiérrez ,Y Xie ,R L Mccarthy ,T Hebbeker ,B Zhou ,T Zhao ,Y Enari ,E Boos ,D V Bandurin ,F Fiedler ,A Popov ,S Jabeen ,G Petrillo ,J.-F Grivaz ,R Brock ,H Severini ,S Desai ,В Н Евдокимов ,S Choi ,C Hensel ,T Ferbel ,D Lincoln ,B Abbott ,M Wobisch ,D Tsybychev ,M Zieliński ,M Besançon ,K Augsten ,D Wood ,G Chen ,H E Fisk ,H Yin ,J Linnemann ,V Bhatnagar ,Jaehoon Lim ,G Gutiérrez ,G Watts ,S Dutt ,B S Acharya ,V M Podstavkov ,R Kehoe ,G Borissov ,A Das ,Han Liu ,S K Park ,J Lellouch ,Mark Richard James Williams ,D Price ,J L Holzbauer ,C Tully ,M P Sanders ,V E Bazterra ,V V Tokmenin ,M Corcoran ,F Déliot ,I A Vasilyev ,X Lei ,A Y Verkheev ,S B Beri ,P Vokáč ,A Bean ,P G Mercadante ,J M Hogan ,F Rizatdinova ,P F Ding ,S W Lee ,Peng Jiang ,E W Varnes ,J F Bartlett ,H D Wahl ,S M Shaw ,J Hobbs ,V Buescher ,P Baringer ,G Davies ,T R Wyatt ,Ph Gris ,C P Buszello ,R Lipton ,M Strauss ,J A García-González ,H Fox ,G W Wilson ,É Chapon ,V Gavrilov ,A Kupčo ,S Malik ,P Pétroff ,F Couderc ,D Ziemińska ,P D Grannis ,S Grünendahl ,L Uvarov ,X B Bu ,A Duperrin ,L Živković

doi:10.1103/physrevlett.112.111804

Abstract

We present a measurement of the direct CP-violating charge asymmetry in Ds+→ϕπ± decays where the ϕ meson decays to K+K−, using the full Run II data set with an integrated luminosity of 10.4 fb−1 of proton-antiproton collisions collected using the D0 detector at the Fermilab Tevatron Collider. The normalized difference ACP in the yield of Ds+ and Ds− mesons in these decays is measured by fitting the difference between their reconstructed invariant mass distributions. This results in an asymmetry of ACP=[−0.38±0.27]%, which is the most precise measurement of this quantity to date. The result is consistent with the standard model prediction of zero CP asymmetry in this decay.Received 4 December 2013DOI:https://doi.org/10.1103/PhysRevLett.112.111804© 2014 American Physical Society

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