Measurement of branching fractions andCPviolation parameters inB→ωKdecays with first evidence ofCPviolation inB0→ωKs0

V Chobanova,D Dutta,A Moll,J Dalseno,A Zupanc,T Kuhr,A Chen,P Lukin,H Sahoo,K Chilikin,E Won,V Aulchenko,E Nedelkovska,S Stanič,K Cho,T Iwashita,B Kronenbitter,V Zhilich,A Sibidanov,Y Ban,B Shwartz,K Hayasaka,T Sanuki,D Semmler,Y Horii,D Červenkov,S Esen,Y Choi,K Kinoshita,L Li Gioi,J Li,M Danilov,P Kodyš,T Kumita,R Gillard,E Kato,H Park,G Tatishvili,R Mizuk,P Pakhlov,O Nitoh,P Wang,M Steder,C Van Hulse,O Seon,K Senyo,M Starič,A Kuzmin,S Uno,D Cinabro,W.-S Hou,I Adachi,V Vorobyev,V Savinov,S Ganguly,A Rostomyan,Z Drásal,Y Yamashita,T Iijima,K Belous,H Aihara,J Klucar,Y Watanabe,D Matvienko,K Miyabayashi,T Saito,Z Natkaniec,V Chekelian,M Nayak,T Julius,G Bonvicini,Y Teramoto,T Ferber,P Vanhoefer,T Uglov,S Ogawa,K Trabelsi,T Aziz,S Okuno,H Miyata,A Bobrov,Z Doležal,N Muramatsu,A Ishikawa,A Garmash,S Eidelman,G Varner,T Kawasaki,B Golob,K Dutta,K Sumisawa,M Ritter,M Uchida,M Nakao,O Schneider,R Pestotnik,V Gaur,V Zhulanov,Y Sakai,G Pakhlova,M Shapkin,N Gabyshev,A Vinokurova,Y Unno,C Kiesling,M Röhrken,B Bhuyan,Y Hoshi,E Nakano,A Bala,S Yashchenko,K Inami,D Liventsev,S Korpar,H Miyake,R Chistov,R Mussa,M Watanabe,J Libby,T Sumiyoshi,M Petrič,Y Li,S Nishida,H Kawai,H Yamamoto,J Haba,U Tamponi,Y Iwasaki,F Simon,P Krokovny,T Aushev,M Bračko,H Farhat,J E Fast ,J H Kang ,Y J Kim ,Tao Peng ,A J Schwartz ,T A Shibata ,S H Lee ,H J Kim ,Y S Sohn ,A M Bakich ,M Z Wang ,C H Wang ,B R Ko ,X He ,Z P Zhang ,G B Mohanty ,K M Williams ,J B Kim ,K E Varvell ,L Šantelj ,T K Pedlar ,J H Kim ,Y M Goh ,B G Cheon ,T E Browder ,J G Shiu ,M J Kim ,H J Hyun ,I Jaeglé ,Y Hsiung ,C W Park ,N K Nisar ,M N Wagner ,A Bożek ,J S Lange ,D M Asner ,H K Park ,C R Ng ,M E Sevior ,D Y Kim ,L E Piilonen

doi:10.1103/physrevd.90.012002

Abstract

We present a measurement of the branching fractions and charge-parity-(CP-) violating parameters in B -> omega K decays. The results are obtained from the final data sample containing 772 x 10^(6) BBbar pairs collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We obtain the branching fractions B(B0 -> omega K0) = (4.5 +/- 0.4 (stat) +/- 0.3 (syst)) x 10^(-6), B(B- -> omega K-) = (6.8 +/- 0.4 (stat) +/- 0.4 (syst)) x 10^(-6), which are in agreement with their respective current world averages. For the CP violating parameters, we obtain A(B0 -> omega KS) = -0.36 +/- 0.19 (stat) +/- 0.05 (syst), S(B0 -> omega KS) = +0.91 +/- 0.32 (stat) +/- 0.05 (syst), A(B- -> omega K-) = -0.03 +/- 0.04 (stat) +/- 0.01 syst), where A and S represent the direct and mixing-induced CP asymmetry, respectively. We find no evidence of CP violation in the decay channel B-->omega K-; however, we obtain the first evidence of CP violation in the B0 -> omega KS decay channel at the level of 3.1 standard deviations.

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