Determination of the (B)over-bar -> D(*)l(nu)over-bar decay width and vertical bar V-cb vertical bar
Abstract
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 \V-cb\ using a sample of 3x10(6) B (B) over bar events in the CLEO detector at the Cornell Electron Storage Ring. We determine the yield of reconstructed (B) over bar (0)-->D*(+)l (ν) over bar and B--->D(*0)l (ν) over bar 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 dGamma/dw. By extrapolating dGamma/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. We find \V-cb\F(1)=0.0431+/-0.0013(stat)+/-0.0018(syst). We combine \V-cb\F(1) with theoretical results for F(1) to determine \V-cb\=0.0469+/-0.0014(stat)+/-0.0020(syst)+/-0.0018(theor). We also integrate the differential decay rate over w to obtain B((B) over bar (0)-->D*(+)(ν) over bar)=(6.09+/-0.19+/-0.40)% and B(B--->D*(0)l (ν) over bar)=(6.50+/-0.20+/-0.43)%.
Published in:
Physical Review D 67,3 (2003) 032001;
Link to original published article:
http://dx.doi.org/10.1103/PhysRevD.67.032001
Keywords
quark effective theory;; effective field-theory;; b-meson decays;; kobayashi-maskawa matrix;; form-factors;; branching fraction;; semileptonic decays;; dispersive bounds;; heavy quarks;; cp-violation
Date of Version
January 2003
Recommended Citation
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-Kruger, 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.; Eisenstein, B. I.; Ernst, J.; Gollin, G. D.; Hans, R. M.; Karliner, I.; Lowrey, N.; Marsh, M. A.; Plager, C.; Sedlack, C.; Selen, M.; Thaler, J. J.; Williams, J.; Edwards, K. W.; Ammar, R.; Besson, D.; Zhao, X.; Anderson, S.; Frolov, V. V.; Kubota, Y.; Lee, S. J.; Li, S. Z.; Poling, R.; Smith, A.; Stepaniak, C. J.; Urheim, J.; Ahmed, S.; Alam, M. S.; Jian, L.; Saleem, M.; Wappler, F.; Eckhart, E.; Gan, K. K.; Gwon, C.; Hart, T.; Honscheid, K.; Hufnagel, D.; Kagan, H.; Kass, R.; Pedlar, T. K.; Thayer, J. B.; von Toerne, E.; Wilksen, T.; Zoeller, M. M.; Richichi, S. J.; Severini, H.; Skubic, P.; Dytman, S. A.; Nam, S.; Savinov, V.; Chen, S.; Hinson, J. W.; Lee, J.; Miller, D. H.; Pavlunin, V.; Shibata, E. I.; Shipsey, I. P. J.; Cronin-Hennessy, D.; Lyon, A. L.; Park, C. S.; Park, W.; Thorndike, E. H.; Coan, T. E.; Gao, Y. S.; Liu, F.; Maravin, Y.; Narsky, I.; Stroynowski, R.; Ye, J.; Artuso, M.; Boulahouache, C.; Bukin, K.; Dambasuren, E.; Mountain, R.; Skwarnicki, T.; Stone, S.; Wang, J. C.; Mahmood, A. H.; Csorna, S. E.; Danko, I.; Xu, Z.; Bonvicini, G.; Cinabro, D.; Dubrovin, M.; McGee, S.; Bornheim, A.; Lipeles, E.; Pappas, S. P.; Shapiro, A.; Sun, W. M.; Weinstein, A. J.; Masek, G.; Paar, H. P.; Mahapatra, R.; Briere, R. A.; Chen, G. P.; Ferguson, T.; Tatishvili, G.; and Vogel, H., "Determination of the (B)over-bar -> D(*)l(nu)over-bar decay width and vertical bar V-cb vertical bar" (2003). Department of Physics and Astronomy Faculty Publications. Paper 508.
https://docs.lib.purdue.edu/physics_articles/508