We present a measurement of the Cabibbo-Kobayashi-Maskawa matrix element vertical bar V-cb vertical bar based on a sample of about 53 700 (B) over bar (0) -> D*(+)l(-)(nu) over bar (l) decays observed by the BABAR detector. We obtain the branching fraction averaged over l = e, mu, B((B) over bar (0) -> D*(+)l(-)(nu) over bar (l)) = (4.90 +/- 0.07(stat.)(-0.35)(+0.36)(syst.))%. We measure the differential decay rate as a function of iv, the relativistic boost gamma of the D*+ in the Wo rest frame. By extrapolating d Gamma/dw to the kinematic limit w -> 1, we extract the product of vertical bar V-cb vertical bar and the axial form factor A(1)(w = 1). We combine this measurement with a lattice QCD calculation of A(1)(w = 1) to determine vertical bar V-cb vertical bar = (38.7 +/- 0.3(stat.) +/- 1.7(syst.)(-1.3)(+1.5)(theory)) x 10(-3).
Measurement of the (B)over-bar(0)-> D(*+)l(-)(nu)over-bar(l) decay rate and vertical bar V-cb vertical bar / B. Aubert, R. Barate, D. Boutigny, F. Couderc, J. Gaillard, A. Hicheur, Y. Karyotakis, J.P. Lees, V. Tisserand, A. Zghiche, A. Palano, A. Pompili, J.C. Chen, N.D. Qi, G. Rong, P. Wang, Y.S. Zhu, G. Eigen, I. Ofte, B. Stugu, G.S. Abrams, A.W. Borgland, A.B. Breon, D.N. Brown, J. Button Shafer, R.N. Cahn, E. Charles, C.T. Day, M.S. Gill, A.V. Gritsan, Y. Groysman, R.G. Jacobsen, R.W. Kadel, J. Kadyk, L.T. Kerth, Y.G. Kolomensky, G. Kukartsev, G. Lynch, L.M. Mir, P.J. Oddone, T.J. Orimoto, M. Pripstein, N.A. Roe, M.T. Ronan, V.G. Shelkov, W.A. Wenzel, M. Barrett, K.E. Ford, T.J. Harrison, A.J. Hart, C.M. Hawkes, S.E. Morgan, A.T. Watson, M. Fritsch, K. Goetzen, T. Held, H. Koch, B. Lewandowski, M. Pelizaeus, M. Steinke, J.T. Boyd, N. Chevalier, W.N. Cottingham, M.P. Kelly, T.E. Latham, F.F. Wilson, T. Cuhadar Donszelmann, C. Hearty, N.S. Knecht, T.S. Mattison, J.A. Mckenna, D. 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Measurement of the (B)over-bar(0)-> D(*+)l(-)(nu)over-bar(l) decay rate and vertical bar V-cb vertical bar
A. Lazzaro;F. Palombo;N. Neri;
2005
Abstract
We present a measurement of the Cabibbo-Kobayashi-Maskawa matrix element vertical bar V-cb vertical bar based on a sample of about 53 700 (B) over bar (0) -> D*(+)l(-)(nu) over bar (l) decays observed by the BABAR detector. We obtain the branching fraction averaged over l = e, mu, B((B) over bar (0) -> D*(+)l(-)(nu) over bar (l)) = (4.90 +/- 0.07(stat.)(-0.35)(+0.36)(syst.))%. We measure the differential decay rate as a function of iv, the relativistic boost gamma of the D*+ in the Wo rest frame. By extrapolating d Gamma/dw to the kinematic limit w -> 1, we extract the product of vertical bar V-cb vertical bar and the axial form factor A(1)(w = 1). We combine this measurement with a lattice QCD calculation of A(1)(w = 1) to determine vertical bar V-cb vertical bar = (38.7 +/- 0.3(stat.) +/- 1.7(syst.)(-1.3)(+1.5)(theory)) x 10(-3).File | Dimensione | Formato | |
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