Phys. Rev. Lett.
89,
081803
(2002)
[5 pages]
Improved Measurement of |Vcb| Using B̅ →D*ℓν̅ Decays
R. A. Briere et al. CLEO Collaboration
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R. A. Briere1, G. P. Chen1, T. Ferguson1, G. Tatishvili1, H. Vogel1, N. E. Adam2, J. P. Alexander2, C. Bebek2, B. E. Berger2, K. Berkelman2, F. Blanc2, V. Boisvert2, D. G. Cassel2, P. S. Drell2, J. E. Duboscq2, K. M. Ecklund2, R. Ehrlich2, L. Gibbons2, B. Gittelman2, S. W. Gray2, D. L. Hartill2, B. K. Heltsley2, L. Hsu2, C. D. Jones2, J. Kandaswamy2, D. L. Kreinick2, A. Magerkurth2, H. Mahlke-Krüger2, T. O. Meyer2, N. B. Mistry2, E. Nordberg2, M. Palmer2, J. R. Patterson2, D. Peterson2, J. Pivarski2, D. Riley2, A. J. Sadoff2, H. Schwarthoff2, M. R. Shepherd2, J. G. Thayer2, D. Urner2, B. Valant-Spaight2, G. Viehhauser2, A. Warburton2, M. Weinberger2, S. B. Athar3, P. Avery3, H. Stoeck3, J. Yelton3, G. Brandenburg4, A. Ershov4, D. Y.-J. Kim4, R. Wilson4, K. Benslama5, B. I. Eisenstein5, J. Ernst5, G. D. Gollin5, R. M. Hans5, I. Karliner5, N. Lowrey5, M. A. Marsh5, C. Plager5, C. Sedlack5, M. Selen5, J. J. Thaler5, J. Williams5, K. W. Edwards6, R. Ammar7, D. Besson7, X. Zhao7, S. Anderson8, V. V. Frolov8, Y. Kubota8, S. J. Lee8, S. Z. Li8, R. Poling8, A. Smith8, C. J. Stepaniak8, J. Urheim8, S. Ahmed9, M. S. Alam9, L. Jian9, M. Saleem9, F. Wappler9, E. Eckhart10, K. K. Gan10, C. Gwon10, T. Hart10, K. Honscheid10, D. Hufnagel10, H. Kagan10, R. Kass10, T. K. Pedlar10, J. B. Thayer10, E. von Toerne10, T. Wilksen10, M. M. Zoeller10, S. J. Richichi11, H. Severini11, P. Skubic11, S. A. Dytman12, S. Nam12, V. Savinov12, S. Chen13, J. W. Hinson13, J. Lee13, D. H. Miller13, V. Pavlunin13, E. I. Shibata13, I. P. J. Shipsey13, D. Cronin-Hennessy14, A. L. Lyon14, C. S. Park14, W. Park14, E. H. Thorndike14, T. E. Coan15, Y. S. Gao15, F. Liu15, Y. Maravin15, I. Narsky15, R. Stroynowski15, J. Ye15, M. Artuso16, C. Boulahouache16, K. Bukin16, E. Dambasuren16, R. Mountain16, T. Skwarnicki16, S. Stone16, J. C. Wang16, A. H. Mahmood17, S. E. Csorna18, I. Danko18, Z. Xu18, G. Bonvicini19, D. Cinabro19, M. Dubrovin19, S. McGee19, A. Bornheim20, E. Lipeles20, S. P. Pappas20, A. Shapiro20, W. M. Sun20, A. J. Weinstein20, G. Masek21, H. P. Paar21, and R. Mahapatra22 (CLEO Collaboration)
1Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
2Cornell University, Ithaca, New York 14853
3University of Florida, Gainesville, Florida 32611
4Harvard University, Cambridge, Massachusetts 02138
5University of Illinois, Urbana-Champaign, Illinois 61801
6Carleton University, Ottawa, Ontario, Canada K1S 5B6 and the Institute of Particle Physics, Canada M5S 1A7
7University of Kansas, Lawrence, Kansas 66045
8University of Minnesota, Minneapolis, Minnesota 55455
9State University of New York at Albany, Albany, New York 12222
10The Ohio State University, Columbus, Ohio 43210
11University of Oklahoma, Norman, Oklahoma 73019
12University of Pittsburgh, Pittsburgh, Pennsylvania 15260
13Purdue University, West Lafayette, Indiana 47907
14University of Rochester, Rochester, New York 14627
15Southern Methodist University, Dallas, Texas 75275
16Syracuse University, Syracuse, New York 13244
17University of Texas–Pan American, Edinburg, Texas 78539
18Vanderbilt University, Nashville, Tennessee 37235
19Wayne State University, Detroit, Michigan 48202
20California Institute of Technology, Pasadena, California 91125
21University of California, San Diego, La Jolla, California 92093
22University of California, Santa Barbara, California 93106
Received 11 March 2002; published 6 August 2002
We determine the weak coupling |Vcb| between the b and c quarks using a sample of 3×106 BB̅ events in the CLEO detector at the Cornell Electron Storage Ring. We determine the yield of reconstructed B̅ →D*ℓν̅ 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. Combined with theoretical results for F(1) we determine |Vcb|=0.0469±0.0014(stat)±0.0020(syst)±0.0018(theor).
© 2002 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.081803
DOI:
10.1103/PhysRevLett.89.081803
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