Phys. Rev. D
67,
072001
(2003)
[10 pages]
Measurement of lepton momentum moments in the decay B̅ →Xlν̅ and determination of the heavy quark expansion parameters and |Vcb|
A. H. Mahmood et al. (CLEO Collaboration)
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A. H. Mahmood1, S. E. Csorna2, I. Danko2, G. Bonvicini3, D. Cinabro3, M. Dubrovin3, S. McGee3, A. Bornheim4, E. Lipeles4, S. P. Pappas4, A. Shapiro4, W. M. Sun4, A. J. Weinstein4, R. A. Briere5, G. P. Chen5, T. Ferguson5, G. Tatishvili5, H. Vogel5, N. E. Adam6, J. P. Alexander6, K. Berkelman6, V. Boisvert6, D. G. Cassel6, P. S. Drell6, J. E. Duboscq6, K. M. Ecklund6, R. Ehrlich6, R. S. Galik6, L. Gibbons6, B. Gittelman6, S. W. Gray6, D. L. Hartill6, B. K. Heltsley6, L. Hsu6, C. D. Jones6, J. Kandaswamy6, D. L. Kreinick6, A. Magerkurth6, H. Mahlke-Krüger6, T. O. Meyer6, N. B. Mistry6, J. R. Patterson6, D. Peterson6, J. Pivarski6, S. J. Richichi6, D. Riley6, A. J. Sadoff6, H. Schwarthoff6, M. R. Shepherd6, J. G. Thayer6, D. Urner6, T. Wilksen6, A. Warburton6, M. Weinberger6, S. B. Athar7, P. Avery7, L. Breva-Newell7, V. Potlia7, H. Stoeck7, J. Yelton7, K. Benslama8, B. I. Eisenstein8, G. D. Gollin8, I. Karliner8, N. Lowrey8, C. Plager8, C. Sedlack8, M. Selen8, J. J. Thaler8, J. Williams8, K. W. Edwards9, R. Ammar10, D. Besson10, X. Zhao10, S. Anderson11, V. V. Frolov11, D. T. Gong11, Y. Kubota11, S. Z. Li11, R. Poling11, A. Smith11, C. J. Stepaniak11, J. Urheim11, Z. Metreveli12, K. K. Seth12, A. Tomaradze12, P. Zweber12, S. Ahmed13, M. S. Alam13, J. Ernst13, L. Jian13, M. Saleem13, F. Wappler13, K. Arms14, E. Eckhart14, K. K. Gan14, C. Gwon14, K. Honscheid14, D. Hufnagel14, H. Kagan14, R. Kass14, T. K. Pedlar14, E. von Toerne14, M. M. Zoeller14, H. Severini15, P. Skubic15, S. A. Dytman16, J. A. Mueller16, S. Nam16, V. Savinov16, S. Chen17, J. W. Hinson17, J. Lee17, D. H. Miller17, V. Pavlunin17, E. I. Shibata17, I. P. J. Shipsey17, D. Cronin-Hennessy18, A. L. Lyon18, C. S. Park18, W. Park18, J. B. Thayer18, E. H. Thorndike18, T. E. Coan19, Y. S. Gao19, F. Liu19, Y. Maravin19, R. Stroynowski19, M. Artuso20, C. Boulahouache20, S. Blusk20, K. Bukin20, E. Dambasuren20, R. Mountain20, H. Muramatsu20, R. Nandakumar20, T. Skwarnicki20, S. Stone20, and J. C. Wang20 (CLEO Collaboration)
1University of Texas–Pan American, Edinburg, Texas 78539
2Vanderbilt University, Nashville, Tennessee 37235
3Wayne State University, Detroit, Michigan 48202
4California Institute of Technology, Pasadena, California 91125
5Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
6Cornell University, Ithaca, New York 14853
7University of Florida, Gainesville, Florida 32611
8University of Illinois, Urbana-Champaign, Illinois 61801
9Carleton University, Ottawa, Ontario, Canada K1S 5B6the Institute of Particle Physics, Canada M5S 1A7
10University of Kansas, Lawrence, Kansas 66045
11University of Minnesota, Minneapolis, Minnesota 55455
12Northwestern University, Evanston, Illinois 60208
13State University of New York at Albany, Albany, New York 12222
14Ohio State University, Columbus, Ohio 43210
15University of Oklahoma, Norman, Oklahoma 73019
16University of Pittsburgh, Pittsburgh, Pennsylvania 15260
17Purdue University, West Lafayette, Indiana 47907
18University of Rochester, Rochester, New York 14627
19Southern Methodist University, Dallas, Texas 75275
20Syracuse University, Syracuse, New York 13244
Received 18 December 2002; published 23 April 2003
We measure the primary lepton momentum spectrum in B̅ →Xlν̅ decays, for pl>~1.5GeV/c in the B rest frame. From this, we calculate various moments of the spectrum. In particular, we find R0≡∫1.7GeV(dΓ/dEsl)dEl/∫1.5GeV(dΓ/dEsl)dEl=0.6187±0.0014stat±0.0016sys and R1≡∫1.5GeVEl(dΓ/dEsl)dEl/∫1.5GeV(dΓ/dEsl)dEl=(1.7810±0.0007stat±0.0009sys)GeV. We use these moments to determine non-perturbative parameters governing the semileptonic width. In particular, we extract the heavy quark expansion parameters Λ̅ =(0.39±0.03stat±0.06sys±0.12th)GeV and λ1=(-0.25±0.02stat±0.05sys±0.14th)GeV2. The theoretical constraints used are evaluated through order 1/MB3 in the non-perturbative expansion and β0αs2 in the perturbative expansion. We use these parameters to extract |Vcb| from the world average of the semileptonic width and find |Vcb|=(40.8±0.5Γsl±0.4(λ1,Λ̅ )exp±0.9th)×10-3. In addition, we extract the short range b-quark mass mb1S=(4.82±0.07exp±0.11th)GeV/c2. Finally, we discuss the implications of our measurements for the theoretical understanding of inclusive semileptonic processes.
© 2003 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.67.072001
DOI:
10.1103/PhysRevD.67.072001
PACS:
12.39.Hg, 14.60.Cd, 14.60.Ef, 14.65.Fy
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