New measurement of [formula omitted] branching ratio

J M Link ,M Sheaff,I Segoni,J Magnin,C Pontoglio,A Massafferri,Y Zhang,G Liguori,P Inzani,A Paris,E Casimiro,S Carrillo,G Boca,A Kryemadhi,D Lopes Pegna,H Park,T Handler,M Bertani,H Hernandez,C Uribe,M Hosack,F Prelz,M Dicorato,L Cinquini,D Engh,E Luiggi,E Polycarpo,C Cawlfield,S Erba,S Sala,M Mezzadri,S Barberis,A Zallo,S Pacetti,L Edera,L Agostino,I Gaines,F Leveraro,J Quinones,M Nehring,A M Rahimi ,Agustín Cobos Cerutti ,F Fabbri ,Eric Wayne Vaandering ,G Gianini,J E Ramirez Vargas ,P H Garbincius ,K Cho,A C Dos Reis ,P Kasper ,S Bianco,Cheol-Gi Go ,Frygin Va ,J S Kang ,B R Ko ,E Cuautle,H W K Cheung ,G Alimonti,S P Ratti ,M Reyes,P M Yager ,J N Butler ,J C Anjos ,K B Lee ,A López ,H Méndez ,T F Davenport ,Y S Chung ,K Stenson,L Garren ,A Sánchez-Hernández,I Bediaga,J P Cumalat ,M Rovere,P D’angelo ,M M Merlo ,J M De Miranda ,P Vitulo,D Menasce,D Pedrini,J Wiss,S Malvezzi,M Wang,D Pantea,L Benussi,P Dini,J Otálora ,Vincenzo Arena ,D Y Kim ,P Sheldon ,J E Moore ,J W Kwak ,E Gottschalk,C Castromonte,A Kreymer ,R Kutschke,L Moroni,M Webster,I M Pepe ,J R Wilson ,C Riccardi,B O’reilly ,M Boschini,W Johns ,R Gardner,A A Machado ,G Bonomi,G Chiodini,R E Mitchell

doi:10.1016/j.physletb.2006.04.002

Abstract

Using data collected by the FOCUS experiment at Fermilab, we present a new measurement of the charm semileptonic branching ratio BR(D+→ρ0μ+ν)BR(D+→K¯∗0μ+ν). From a sample of 320±44 and 11372±161D+→ρ0μ+ν and D+→K−π+μ+ν events respectively, we find BR(D+→ρ0μ+ν)BR(D+→K¯∗0μ+ν)=0.041±0.006 (stat)±0.004 (syst).

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