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Improved measurement of /V(cb)/ using B-->D*l nu decays |
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| Authors: | Briere R A Chen G P Ferguson T Tatishvili G Vogel H Adam N E Alexander J P Bebek C Berger B E Berkelman K Blanc F Boisvert V Cassel D G Drell P S Duboscq J E Ecklund K M Ehrlich R Gibbons L Gittelman B Gray S W Hartill D L Heltsley B K Hsu L Jones C D Kandaswamy J Kreinick D L Magerkurth A Mahlke-Krüger H Meyer T O Mistry N B Nordberg E Palmer M Patterson J R Peterson D Pivarski J Riley D Sadoff A J Schwarthoff H Shepherd M R Thayer J G Urner D Valant-Spaight B Viehhauser G Warburton A Weinberger M Athar S B Avery P Stoeck H Yelton J Brandenburg G Ershov A Kim D Y-J Wilson R Benslama K |
| Institution: | Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA. |
| Abstract: | We determine the weak coupling /V(cb)/ between the b and c quarks using a sample of 3 x 10(6) BB; events in the CLEO detector at the Cornell Electron Storage Ring. We determine the yield of reconstructed B-->D*l nu; decays as a function of w, the boost of the D* in the B rest frame, and from this we obtain the differential decay rate d Gamma/dw. By extrapolating d Gamma/dw to w=1, the kinematic end point at which the D* is at rest relative to the B, we extract the product /V(cb)/F(1), where F(1) is the form factor at w=1. Combined with theoretical results for F(1) we determine /V(cb)/=0.0469+/-0.0014(stat)+/-0.0020(syst)+/-0.0018(theor). |
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