Measurement of B ( D + → K ¯ * 0 l + ν l )

K M Ecklund,J E Duboscq, P S Drell,D G Cassel, V Boisvert,F Blanc, K Berkelman,C Bebek,J P Alexander,N Adam,H Vogel,G Tatishvili,T Ferguson, G P Chen,G Brandenburg,A Ershov,D Y J Kim,R J Wilson,K Benslama,H P Paar,R Mahapatra,R A Briere,B I Eisenstein,G E Masek,A J Weinstein, W M Sun,A Shapiro,S P Pappas, E Lipeles,A Bornheim,S Mcgee,J Ernst, M S Dubrovin,D Cinabro,G Bonvicini,G D Gollin,R M Hans,I Karliner,N Lowrey,M A Marsh, C Plager,C Sedlack,M Selen,J J Thaler,J C Williams, K W Edwards,R Ammar,D Besson,X Zhao,S Anderson,V V Frolov,Y Kubota,S J Lee,S Z Li,R Poling,A J S Smith,C J Stepaniak,J Urheim,S Ahmed, M S Alam,L Jian,M Saleem,F R Wappler,E A Eckhart,K K Gan, C Gwon, T Hart,K Honscheid,D Hufnagel,H Kagan, R Kass,T K Pedlar, E Von Toerne,T Wilksen,M M Zoeller, S J Richichi, H Severini, P Skubic,S A Dytman,Soonkwon Nam, V Savinov,S Chen,J W Hinson,J Lee, G H A Viehhauser,A Warburton,M Weinberger,S B Athar,B Gittelman,S W Gray,D L Hartill, B K Heltsley, P Avery,H Stoeck,J Yelton,D H Miller, V Pavlunin,E I Shibata, I P J Shipsey, D Croninhennessy,A L Lyon,C S Park, W Park, E H Thorndike,T E Coan,Y S Gao, F Liu, Y Maravin,I Narsky, R Stroynowski,Jieping Ye,M Artuso, C Boulahouache, K Bukin,E Dambasuren,L Hsu,C D Jones,J Kandaswamy,R Mountain, T Skwarnicki,D L Kreinick,S Stone,A Magerkurth,H Mahlkekruger,T O Meyer,N B Mistry,E Nordberg,Mark Palmer, J R Patterson,J C Wang,A H Mahmood,S E Csorna,I Danko, Dawn E Peterson,J Pivarski, Zhenhai Xu,D Riley,A J Sadoff,H Schwarthoff,M R Shepherd,J G Thayer,D Urner, B Valantspaight, L Gibbons,R Ehrlich

Physical Review Letters（2002）

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摘要

Using 13.53 fb - 1 of CLEO data, we have measured the ratios of the branching fractions R + e , R + μ and the combined branching fraction ratio R + l , defined by R + l = [B(D + → K* 0 l + v l )]/[B(D + → K - π + π + )]. We find R + e = 0.74 ′ 0.04 ′ 0.05, R + μ = 0.72 ′ 0.10 ′ 0.05, and R + l = 0.74 ′ 0.04 ′ 0.05, where the first and second errors are statistical and systematic, respectively. The known branching fraction B(D + → K - π + π + ) leads to B(D + → K* 0 e + v e ) = (6.7 ′ 0.4 ′ 0.5 ′ 0.4)%, B(D + → k* 0 μ + v μ ) = (6.5 ′ 0.9 ′ 0.5 ′ 0.4)%, and B(D + → K* 0 l + v l ) = (6.7 ′ 0.4 ′ 0.5 ′ 0.4)%, where the third error is due to the uncertainty in B(D + → K - π + π + ).

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