Measurements of the branching fractions and helicity amplitudes inB→D*ρdecays

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

doi:10.1103/physrevd.67.112002

Abstract

Using 9.1 fb-1 of e+ e- data collected at the Upsilon(4S) with the CLEO detector using the Cornell Electron Storage Ring, measurements are reported for both the branching fractions and the helicity amplitudes for the decays B- -> D*0 rho- and B0bar -> D*+ rho-. The fraction of longitudinal polarization in B0bar -> D*+ rho- is found to be consistent with that in B0bar -> D*+ l- nubar at q^2 = M^2_rho, indicating that the factorization approximation works well. The longitudinal polarization in the B- mode is similar. The measurements also show evidence of non-trivial final-state interaction phases for the helicity amplitudes.

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