Abstract
We measure the primary lepton momentum spectrum in (B) over bar -->Xl (ν) over bar decays, for plgreater than or equal to1.5 GeV/c in the B rest frame. From this, we calculate various moments of the spectrum. In particular, we find R(0)equivalent tointegral(1.7 GeV)(dGamma/dE(sl))dEl/integral(1.5 GeV)(dGamma/dE(sl))dEl=0.6187+/-0.0014(stat)+/-0.0016(sys) and R(1)equivalent tointegral(1.5 GeV)El(dGamma/dE(sl))dEl/integral(1.5 GeV)(dGamma/dE(sl))dEl=(1.7810+/-0.0007(stat)+/-0.0009(sys)) GeV. We use these moments to determine non-perturbative parameters governing the semileptonic width. In particular, we extract the heavy quark expansion parameters (&ULambda;) over bar=(0.39+/-0.03(stat)+/-0.06(sys)+/-0.12(th)) GeV and lambda(1)=(-0.25+/-0.02(stat)+/-0.05(sys)+/-0.14(th)) GeV2. The theoretical constraints used are evaluated through order 1/M-B(3) in the non-perturbative expansion and beta(0)alpha(s)(2) in the perturbative expansion. We use these parameters to extract \V-cb\ from the world average of the semileptonic width and find \V-cb\=(40.8+/-0.5(Gammasl)+/-0.4((lambda1),((&ULambda;) over bar )exp)+/-0.9(th))x10(-3). In addition, we extract the short range b-quark mass m(b)(1S)=(4.82+/-0.07(exp)+/-0.11(th)) GeV/c(2). Finally, we discuss the implications of our measurements for the theoretical understanding of inclusive semileptonic processes.
Published in:
Physical Review D 67,7 (2003) 072001;
Link to original published article:
http://dx.doi.org/10.1103/PhysRevD.67.072001
Keywords
radiative-corrections;; semileptonic-b;; qcd;; spectrum;; mass;; physics
Date of Version
January 2003
Recommended Citation
Mahmood, A. H.; Csorna, S. E.; Danko, I.; Bonvicini, G.; Cinabro, D.; Dubrovin, M.; McGee, S.; Bornheim, A.; Lipeles, E.; Pappas, S. P.; Shapiro, A.; Sun, W. M.; Weinstein, A. J.; Briere, R. A.; Chen, G. P.; Ferguson, T.; Tatishvili, G.; Vogel, H.; Adam, N. E.; Alexander, J. P.; Berkelman, K.; Boisvert, V.; Cassel, D. G.; Drell, P. S.; Duboscq, J. E.; Ecklund, K. M.; Ehrlich, R.; Galik, R. S.; 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.; Patterson, J. R.; Peterson, D.; Pivarski, J.; Richichi, S. J.; Riley, D.; Sadoff, A. J.; Schwarthoff, H.; Shepherd, M. R.; Thayer, J. G.; Urner, D.; Wilksen, T.; Warburton, A.; Weinberger, M.; Athar, S. B.; Avery, P.; Breva-Newell, L.; Potlia, V.; Stoeck, H.; Yelton, J.; Benslama, K.; Eisenstein, B. I.; Gollin, G. D.; Karliner, I.; Lowrey, N.; 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.; Gong, D. T.; Kubota, Y.; Li, S. Z.; Poling, R.; Smith, A.; Stepaniak, C. J.; Urheim, J.; Metreveli, Z.; Seth, K. K.; Tomaradze, A.; Zweber, P.; Ahmed, S.; Alam, M. S.; Ernst, J.; Jian, L.; Saleem, M.; Wappler, F.; Arms, K.; Eckhart, E.; Gan, K. K.; Gwon, C.; Honscheid, K.; Hufnagel, D.; Kagan, H.; Kass, R.; Pedlar, T. K.; von Toerne, E.; Zoeller, M. M.; Severini, H.; Skubic, P.; Dytman, S. A.; Mueller, J. 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.; Thayer, J. B.; Thorndike, E. H.; Coan, T. E.; Gao, Y. S.; Liu, F.; Maravin, Y.; Stroynowski, R.; Artuso, M.; Boulahouache, C.; Blusk, S.; Bukin, K.; Dambasuren, E.; Mountain, R.; Muramatsu, H.; Nandakumar, R.; Skwarnicki, T.; Stone, S.; and Wang, J. C., "Measurement of lepton momentum moments in the decay (B)over-bar -> Xl(nu)over-bar and determination of the heavy quark expansion parameters and vertical bar V-cb vertical bar" (2003). Department of Physics and Astronomy Faculty Publications. Paper 538.
https://docs.lib.purdue.edu/physics_articles/538