Measurements of branching fractions forB0→Ds+π−andB¯0→Ds+K−

Arun Das ,P Križan,N Gabyshev,M Iwabuchi,T Julius,T Uglov,B R Ko,A M Bakich,B Bhuyan,Y Sakai,S Mconie,R Itoh,H Sahoo,K Inami,T Kawasaki,T Kumita,C C Zhang,S Nishida,H Miyata,A Zupanc,M J Kim,G B Mohanty,K Miyabayashi,M Bischofberger,N J Joshi,A Chen,K Belous,R Louvot,A Matyja,E Nakano,P Kapusta,I Adachi,Y Miyazaki,M Starič,O Schneider,P Smerkol,K Hayasaka,K Vervink,M Watanabe,Z Drásal,A Drutskoy,H J Hyun,Z Doležal,H Hayashii,G Pakhlova,P Krokovny,M Nakao,M Danilov,D H Kah,J Dalseno,C H Wang,Y Hoshi,J Macnaughton,M Röhrken,Y Choi,Z P Zhang,Y Watanabe,M J Lee,M E Sevior,B Shwartz,S L Olsen,S Esen,M Yamauchi,W Ostrowicz,T Ohshima,B G Cheon,M Bračko,Y Teramoto,H Kawai,Y Yamashita,R Pestotnik,W Dungel,K S Park,C P Shen,K Trabelsi,K Arinstein,C Kiesling,T Aushev,K Senyo,O Nitoh,J S Lange,H Ha,T Kuhr,O Zyukova,S Okuno,H Kichimi,T E Browder,Y Usov,T Iijima,E Won,L E Piilonen,H Park,J H Kang,M Shapkin,D Liventsev,S Uno,E Solovieva,K Kinoshita,V Bhardwaj,S Eidelman,S Uehara,T Sumiyoshi,S Korpar,H Aihara,K M Williams,Y Unno,J H Kim,V Zhulanov,Peng Zhou ,Y Chào ,S H Kyeong ,A Sokolov,A Bondar,S Neubauer,F Simon,S Ryu,J Li,V Shebalin,S H Lee ,W.-S Hou,V Aulchenko,V Balagura,Kenichi Sakai ,S Suzuki,R Kumar,M Petrič,Y J Kim,A Bożek ,Y Horii,V Zhilich,H K Park,C W Park,K F Chen ,E L Barberio ,Rahul Sinha ,I S Cho ,P Kodyš,P Chen,H O Kim,J G Shiu ,C C Chiang ,M Iwasaki ,J B Singh,G Varner,C Liu,Y J Kwon ,H J Kim,Y Liu,P Wang,T Aziz,Takashi Mori

doi:10.1103/physrevd.82.051103

Abstract

We present improved measurements of the branching fractions for the decays B0 --> Ds+pi- and B0-bar --> Ds+K- using a data sample of 657x10^6 BB-bar events collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. The results are BF(B0 --> Ds+pi-) = (1.99 +/- 0.26 +/- 0.18)x10^-5 and BF(B0-bar --> Ds+K-) = (1.91 +/- 0.24 +/- 0.17)x10^-5, where the uncertainties are statistical and systematic, respectively. Based on these results, we determine the ratio between amplitudes of the doubly Cabibbo suppressed decay B0 --> D+pi- and the Cabibbo favored decay B0 --> D-pi+, R_Dpi = [1.71 +/- 0.11(stat) +/- 0.09(syst) +/- 0.02(theo)]%, where the last term denotes the theory error.

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