Measurement ofB(B−→D0π−)andB(B0→D+π−)and isospin analysis ofB¯→Dπdecays

S Ahmed,R Mahapatra,H Kagan,S J Richichi,D L Kreinick,J Urheim,R Ammar,S W Gray,R A Briere,E Von Toerne,M R Shepherd,K Honscheid,H Schwarthoff,M A Marsh,B I Eisenstein,B Valant-Spaight,C J Stepaniak,T E Coan,V Potlia,A J Sadoff,K K Gan,G Tatishvili,D Hufnagel,E Dambasuren,J Pivarski,K W Edwards,G Bonvicini,V Boisvert,D G Cassel,A L Lyon,D Cronin-Hennessy,R Poling,R Ehrlich,N Lowrey,H Stoeck,V Savinov,K K Seth,V Pavlunin,F Liu,E I Shibata,S P Pappas,R Nandakumar,P Skubic,N B Mistry,R Mountain,C Gwon,P S Drell,J E Duboscq,A Bornheim,T K Pedlar,V V Frolov,A H Mahmood,J J Thaler,L Breva-Newell,M Weinberger,K Bukin,C Sedlack,C S Park,D Urner,M Dubrovin,R M Hans,E H Thorndike,D Peterson,T Wilksen,T Hart,E Nordberg,J B Thayer,I Karliner,D Cinabro,M M Zoeller,W Park,J Kandaswamy,L Hsu,B Gittelman,D L Hartill,S B Athar,K Benslama,B K Heltsley,H Mahlke-Krüger,Z Metreveli,K Khroustalev,M S Alam,C Boulahouache,H Muramatsu,J W Hinson,S E Csorna,D Riley,C Plager,A Magerkurth,L Gibbons,T Ferguson,P Avery,J G Thayer,Y Maravin,G Brandenburg,K Berkelman,K M Ecklund,Steven Mcgee ,I P J Shipsey,M Selen,M Saleem,S Stone,A Tomaradze,E Eckhart,S Z Li,A J S Smith ,P Zweber,T O Meyer,S Chen,D Y.j Kim ,D Besson,A Warburton,F R Wappler ,R Kass,A Shapiro,J Alexander ,R Stroynowski,S Nam,T Skwarnicki,H Severini,N Adam ,I Dankó ,Richard Wilson ,S Anderson,J Muêller ,A J Weinstein,J Yelton,M Artuso,Y S Gao,G H A Viehhauser ,E Lipeles,X Zhao,H Vogel,J R Patterson,Y Kubota,J Ernst,S Dytman ,James S Williams ,C D Jones,G D Gollin,W Sun ,J C Wang,S J Lee,D H Miller,G P Chen,L Jian,J Lee

doi:10.1103/physrevd.66.031101

Abstract

We present new measurements of branching fractions for the color-favored decays B−→D0π− and B0→D+π−. Using 9.67×106BB¯ pairs collected with the CLEO detector, we obtain the branching fractions B(B−→D0π−)=(49.7±1.2±2.9±2.2)×10−4 and B(B0→D+π−)=(26.8±1.2±2.4±1.2)×10−4. The first error is statistical, the second is systematic, and the third is due to the experimental uncertainty on the production ratio of charged and neutral B mesons in Υ(4S) decays. These results, together with the current world average for the color-suppressed branching fraction B(B0→D0π0), are used to determine the cosine of the strong phase difference δI between the I=1/2 and I=3/2 isospin amplitudes. We find cosδI=0.863−0.023−0.035−0.030+0.024+0.036+0.038, and obtain a 90% confidence interval of 16.5°<δI<38.1°. This nonzero value of δI suggests the presence of final state interactions in the Dπ system.Received 12 June 2002DOI:https://doi.org/10.1103/PhysRevD.66.031101©2002 American Physical Society

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