Measurement of |V(cb)| and the form-factor slope in B --> Dl- nu(l) decays in events tagged by a fully reconstructed B meson.

Bernard Aubert,Karyotakis Y,Lees J P,Poireau V,Prencipe E,Prudent X,Tisserand V,Garra Tico J,Grauges E,Martinelli M,Palano A,Pappagallo M,Eigen G,Stugu B,Sun L,Battaglia M,Brown D N,Kerth L T,Kolomensky Yu G,Lynch G,Osipenkov I L,Tackmann K,Tanabe T,Hawkes C M,Soni N,Watson A T,Koch H,Schroeder T,Asgeirsson D J,Fulsom B G,Hearty C,Mattison T S,McKenna J A,Barrett M,Khan A,Randle-Conde A,Blinov V E,Bukin A D,Buzykaev A R,Druzhinin V P,Golubev V B,Onuchin A P,Serednyakov S I,Skovpen Yu I,Solodov E P,Todyshev K Yu,Bondioli M,Curry S,Eschrich I,Kirkby D,Lankford A J,Lund P,Mandelkern M,Martin E C,Stoker D P,Atmacan H,Gary J W,Liu F,Long O,Vitug G M,Yasin Z, Zhang L,Sharma V,Campagnari C,Hong T M,Kovalskyi D,Mazur M A,Richman J D,Beck T W,Eisner A M,Heusch C A,Kroseberg J,Lockman W S,Martinez A J,Schalk T,Schumm B A,Seiden A, Wang L, Winstrom L O,Cheng C H,Doll D A,Echenard B,Fang F,Hitlin D G,Narsky I,Piatenko T,Porter F C,Andreassen R,Mancinelli G,Meadows B T,Mishra K,Sokoloff M D,Bloom P C,Ford W T,Gaz A,Hirschauer J F,Nagel M,Nauenberg U,Smith J G,Wagner S R,Ayad R,Toki W H,Wilson R J,Feltresi E,Hauke A,Jasper H,Karbach T M,Merkel J,Petzold A,Spaan B,Wacker K,Kobel M J,Nogowski R,Schubert K R,Schwierz R,Volk A,Bernard D, Latour E,Verderi M,Clark P J,Playfer S,Watson J E,Andreotti M,Bettoni D,Bozzi C,Calabrese R,Cecchi A,Cibinetto G,Fioravanti E,Franchini P,Luppi E,Munerato M,Negrini M,Petrella A,Piemontese L,Santoro V,Baldini-Ferroli R,Calcaterra A,de Sangro R,Finocchiaro G,Pacetti S,Patteri P,Peruzzi I M,Piccolo M,Rama M,Zallo A,Contri R,Guido E,Lo Vetere M,Monge M R,Passaggio S,Patrignani C,Robutti E,Tosi S,Chaisanguanthum K S,Morii M,Adametz A,Marks J,Schenk S,Uwer U,Bernlochner F U,Klose V,Lacker H M,Bard D J,Dauncey P D,Tibbetts M,Behera P K,Charles M J,Mallik U,Cochran J,Crawley H B,Dong L,Eyges V,Meyer W T,Prell S,Rosenberg E I,Rubin A E,Gao Y Y,Gritsan A V,Guo Z J,Arnaud N,Béquilleux J,D'Orazio A,Davier M,Derkach D,da Costa J Firmino,Grosdidier G,Le Diberder 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R,Lewczuk M J,Nugent I M,Roney J M,Sobie R J,Gershon T J,Harrison P F,Ilic J,Latham T E,Mohanty G B,Puccio E M T,Band H R,Chen X,Dasu S,Flood K T,Pan Y,Prepost R,Vuosalo C O,Wu S L, Null Null

Physical review letters（2010）

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摘要

We present a measurement of the Cabibbo-Kobayashi-Maskawa matrix element |V(cb)| and the form-factor slope rho2 in B --> Dl- nu(l) decays based on 460x10(6) BB events recorded at the Upsilon(4S) resonance with the BABAR detector. B --> Dl- nu(l) decays are selected in events in which a hadronic decay of the second B meson is fully reconstructed. We measure B(B- --> D0 l- nu(l))/B(B- --> Xl- nu(l)) = (0.255+/-0.009+/-0.009) and B(B0 --> D+ l- nu(l))/B(B0 --> Xl- nu(l)) = (0.230+/-0.011+/-0.011), along with the differential decay distribution in B --> Dl- nu(l) decays. We then determine G(1)|V(cb)| = (42.3+/-1.9+/-1.4)x10(-3) and rho2 = 1.20+/-0.09+/-0.04, where G(1) is the hadronic form factor at the point of zero recoil.

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matrices,b mesons,distribution,hadrons,decay,bosons,particle decay,elementary particles,dimensionless numbers,mesons,form factor

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