Phys. Rev. D 67, 032001 (2003) [22 pages]Determination of the B̅ →D*lν̅ decay width and |Vcb|Received 14 October 2002; published 27 February 2003 In the standard model, the charged current of the weak interaction is governed by a unitary quark mixing matrix that also leads to CP violation. Measurement of the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements is essential to searches for new physics, either through the structure of the CKM matrix, or a departure from unitarity. We determine the CKM matrix element |Vcb| using a sample of 3×106 BB̅ events in the CLEO detector at the Cornell Electron Storage Ring. We determine the yield of reconstructed B0→D*+lν̅ and B-→D*0lν̅ 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 dΓ/dw. By extrapolating dΓ/dw to w=1, the kinematic end point at which the D* is at rest relative to the B, we extract the product |Vcb|F(1), where F(1) is the form factor at w=1. We find |Vcb|F(1)=0.0431±0.0013(stat)±0.0018(syst). We combine |Vcb|F(1) with theoretical results for F(1) to determine |Vcb|=0.0469±0.0014(stat)±0.0020(syst)±0.0018(theor). We also integrate the differential decay rate over w to obtain B(B0→D*+lν̅ )=(6.09±0.19±0.40)% and B(B-→D*0lν̅ )=(6.50±0.20±0.43)%. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.67.032001
DOI:
10.1103/PhysRevD.67.032001
PACS:
12.15.Hh, 13.20.He
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.