Title

Measurement of the B → Dℓν branching fractions and form factor

Authors

J. Bartelt, Vanderbilt University
S. E. Csorna, Vanderbilt University
K. W. Mc Lean, Vanderbilt University
S. Marka, Vanderbilt University
Z. Xu, Vanderbilt University
R. Godang, Virginia Polytechnic Institute and State University
K. Kinoshita, Virginia Polytechnic Institute and State University
I. C. Lai, Virginia Polytechnic Institute and State University
P. Pomianowski, Virginia Polytechnic Institute and State University
S. Schrenk, Virginia Polytechnic Institute and State University
G. Bonvicini, Wayne State University
D. Cinabro, Wayne State University
R. Greene, Wayne State University
L. P. Perera, Wayne State University
G. J. Zhou, Wayne State University
S. Chan, California Institute of Technology
G. Eigen, California Institute of Technology
E. Lipeles, California Institute of Technology
J. S. Miller, California Institute of Technology
M. Schmidtler, California Institute of Technology
A. Shapiro, California Institute of Technology
W. M. Sun, California Institute of Technology
J. Urheim, California Institute of Technology
A. J. Weinstein, California Institute of Technology
F. Würthwein, California Institute of Technology
D. E. Jaffe, University of California, San Diego
G. Masek, University of California, San Diego
H. P. Paar, University of California, San Diego
E. M. Potter, University of California, San Diego
S. Prell, University of California, San Diego
V. Sharma, University of California, San Diego
D. M. Asner, University of California, Santa Barbara
J. Gronberg, University of California, Santa Barbara

Document Type

Article

Publication Date

1-1-1999

Abstract

Using a sample of 3.3 × 10 B-meson decays collected with the CLEO detector at the Cornell Electron Storage Ring, we have studied B → D ℓ ν and B → D ℓ ν decays, where ℓ can be either e or μ . We distinguish B → Dℓν from other B semileptonic decays by examining the net momentum and energy of the particles recoiling against D - ℓ pairs. We find Γ(B → Dℓν) = (14.1±1.0±1.2)ns and derive branching fractions for B → D ℓ ν and B → D ℓ ν of (2.32±0.17±0.20)% and (2.20±0.16±0.19)%, respectively, where the uncertainties are statistical and systematic. We also investigate the B → Dℓν form factor and the implication of the result for |V |. © 1999 The American Physical Society. 6 - 0 - 0 + - - - - -1 - 0 - 0 + - cb

Publication Name

Physical Review Letters

Volume Number

82

First Page

3746

Last Page

3750

Issue Number

19

DOI

10.1103/PhysRevLett.82.3746

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