Phys. Rev. Lett.
79,
2208–2212
(1997)
Measurement of the B̅ → Dlν̅ Partial Width and Form Factor Parameters
M. Athanas et al. (CLEO Collaboration)
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M. Athanas1, P. Avery1, C. D. Jones1, M. Lohner1, C. Prescott1, J. Yelton1, J. Zheng1, G. Brandenburg2, R. A. Briere2, A. Ershov2, Y. S. Gao2, D. Y.-J. Kim2, R. Wilson2, H. Yamamoto2, T. E. Browder3, F. Li3, Y. Li3, J. L. Rodriguez3, T. Bergfeld4, B. I. Eisenstein4, J. Ernst4, G. E. Gladding4, G. D. Gollin4, R. M. Hans4, E. Johnson4, I. Karliner4, M. A. Marsh4, M. Palmer4, M. Selen4, J. J. Thaler4, K. W. Edwards5,5b, A. Bellerive6,6b, R. Janicek6,6b, D. B. MacFarlane6,6b, P. M. Patel6,6b, A. J. Sadoff7, R. Ammar8, P. Baringer8, A. Bean8, D. Besson8, D. Coppage8, C. Darling8, R. Davis8, N. Hancock8, S. Kotov8, I. Kravchenko8, N. Kwak8, S. Anderson9, Y. Kubota9, S. J. Lee9, J. J. O'Neill9, S. Patton9, R. Poling9, T. Riehle9, V. Savinov9, A. Smith9, M. S. Alam10, S. B. Athar10, Z. Ling10, A. H. Mahmood10, H. Severini10, S. Timm10, F. Wappler10, A. Anastassov11, S. Blinov11, J. E. Duboscq11, D. Fujino11, K. K. Gan11, T. Hart11, K. Honscheid11, H. Kagan11, R. Kass11, J. Lee11, M. B. Spencer11, M. Sung11, A. Undrus11, R. Wanke11, A. Wolf11, M. M. Zoeller11, B. Nemati12, S. J. Richichi12, W. R. Ross12, P. Skubic12, M. Bishai13, J. Fast13, E. Gerndt13, J. W. Hinson13, N. Menon13, D. H. Miller13, E. I. Shibata13, I. P. J. Shipsey13, M. Yurko13, L. Gibbons14, S. Glenn14, S. D. Johnson14, Y. Kwon14, S. Roberts14, E. H. Thorndike14, C. P. Jessop15, K. Lingel15, H. Marsiske15, M. L. Perl15, D. Ugolini15, R. Wang15, X. Zhou15, T. E. Coan16, V. Fadeyev16, I. Korolkov16, Y. Maravin16, I. Narsky16, V. Shelkov16, J. Staeck16, R. Stroynowski16, I. Volobouev16, J. Ye16, M. Artuso17, A. Efimov17, M. Gao17, M. Goldberg17, D. He17, S. Kopp17, G. C. Moneti17, R. Mountain17, S. Schuh17, T. Skwarnicki17, S. Stone17, G. Viehhauser17, X. Xing17, J. Bartelt18, S. E. Csorna18, V. Jain18, K. W. McLean18, S. Marka18, R. Godang19, K. Kinoshita19, I. C. Lai19, P. Pomianowski19, S. Schrenk19, G. Bonvicini20, D. Cinabro20, R. Greene20, L. P. Perera20, G. J. Zhou20, B. Barish21, M. Chadha21, S. Chan21, G. Eigen21, J. S. Miller21, C. O'Grady21, M. Schmidtler21, J. Urheim21, A. J. Weinstein21, F. Würthwein21, D. W. Bliss22, G. Masek22, H. P. Paar22, S. Prell22, V. Sharma22, D. M. Asner23, J. Gronberg23, T. S. Hill23, R. Kutschke23, D. J. Lange23, S. Menary23, R. J. Morrison23, H. N. Nelson23, T. K. Nelson23, C. Qiao23, J. D. Richman23, D. Roberts23, A. Ryd23, M. S. Witherell23, R. Balest24, B. H. Behrens24, W. T. Ford24, H. Park24, J. Roy24, J. G. Smith24, J. P. Alexander25, C. Bebek25, B. E. Berger25, K. Berkelman25, K. Bloom25, D. G. Cassel25, H. A. Cho25, D. M. Coffman25, D. S. Crowcroft25, M. Dickson25, P. S. Drell25, K. M. Ecklund25, R. Ehrlich25, A. D. Foland25, P. Gaidarev25, B. Gittelman25, S. W. Gray25, D. L. Hartill25, B. K. Heltsley25, P. I. Hopman25, J. Kandaswamy25, P. C. Kim25, D. L. Kreinick25, T. Lee25, Y. Liu25, G. S. Ludwig25, J. Masui25, J. Mevissen25, N. B. Mistry25, C. R. Ng25, E. Nordberg25, M. Ogg25, J. R. Patterson25, D. Peterson25, D. Riley25, A. Soffer25, B. Valant-Spaight25, and C. Ward25 (CLEO Collaboration)
1University of Florida, Gainesville, Florida 32611
2Harvard University, Cambridge, Massachusetts 02138
3University of Hawaii at Manoa, Honolulu, Hawaii 96822
4University of Illinois, Champaign-Urbana, Illinois 61801
5Carleton University, Ottawa, Ontario, Canada K1S 5B6
5band the Institute of Particle Physics, Canada
6McGill University, Montréal, Québec, Canada H3A 2T8
6band the Institute of Particle Physics, Canada
7Ithaca College, Ithaca, New York 14850
8University of Kansas, Lawrence, Kansas 66045
9University of Minnesota, Minneapolis, Minnesota 55455
10State University of New York at Albany, Albany, New York 12222
11Ohio State University, Columbus, Ohio 43210
12University of Oklahoma, Norman, Oklahoma 73019
13Purdue University, West Lafayette, Indiana 47907
14University of Rochester, Rochester, New York 14627
15Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309
16Southern Methodist University, Dallas, Texas 75275
17Syracuse University, Syracuse, New York 13244
18Vanderbilt University, Nashville, Tennessee 37235
19Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
20Wayne State University, Detroit, Michigan 48202
21California Institute of Technology, Pasadena, California 91125
22University of California, San Diego, La Jolla, California 92093
23University of California, Santa Barbara, California 93106
24University of Colorado, Boulder, Colorado 80309-0390
25Cornell University, Ithaca, New York 14853
Received 30 May 1997; published in the issue dated 22 September 1997
We have studied the decay B̅ →Dlν̅ , where l = e or μ. From a fit to the differential decay rate dγ/dw we measure the rate normalization FD(1)|Vcb| and form factor slope ρ̂D2, and, using measured values of τB, find γ(B̅ →Dlν̅ ) = (12.0±0.9±2.1)ns-1. The resulting branching fractions are B(B̅ 0→D+l-ν̅ ) = (1.87±0.15±0.32)% and B(B-→D0l-ν̅ ) = (1.94±0.15±0.34)%. The form factor parameters are in agreement with those measured in B̅ →D*lν̅ decays, as predicted by heavy quark effective theory.
© 1997 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.79.2208
DOI:
10.1103/PhysRevLett.79.2208
PACS:
13.20.He, 12.15.Hh, 12.39.Hg
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