Measurement of the B ---> D lepton neutrino branching fractions and form-factor - INSPIRE

DataBETA

Measurement of the B ---> D lepton neutrino branching fractions and form-factor

CLEO

Collaboration

Nov, 1998

11 pages

Published in:

Phys.Rev.Lett. 82 (1999) 3746

e-Print:

hep-ex/9811042 [hep-ex]

DOI:

10.1103/PhysRevLett.82.3746

PDG:

{{\mathit B}^{+}}

\rightarrow

{{\overline{\mathit D}}^{0}}{{\mathit \ell}^{+}}{{\mathit \nu}_{{{{{\mathit \ell}}}}}}

Report number:

SLAC-REPRINT-1998-103,
CLNS-98-1594,
CLEO-98-18

Experiments:

CESR-CLEO-II

View in:

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Abstract:

Using a sample of 3.3 million B-meson decays collected with the CLEO detector at the Cornell Electron Storage Ring, we have studied

B^- \to D^0 \ell\nu

and

\bar{B}^0 \to D^+ \ell\nu

decays, where

\ell

can be either an electron or muon. We distinguish

B \to D \ell\nu

from other B semileptonic decays by examining the net momentum and energy of the particles recoiling against the D-lepton pairs. We find the decay rate

\Gamma(B \to D\ell\nu)

= (14.1 +- 1.0 +- 1.2) ns-1 and derive branching fractions for

B^- \to D^0 \ell\nu

and

\bar{B^0} \to D^+ \ell\nu

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 \to D \ell\nu

form factor and the implication of the result for

|V_{cb}|

.

electron positron: colliding beams
electron positron: annihilation
Upsilon(10570): electroproduction
B: pair production
B: semileptonic decay
correlation: (D lepton)
recoil: energy
B: width
B-: branching ratio
anti-B0: branching ratio

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Figures(0)

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