Measurements of the $B \to D^{*}$ form-factors using the decay $\bar{B}^0 \to D^{*+} e^{-}$ electron-neutrino - INSPIRE

DataBETA

Measurements of the $B \to D^{}$ form-factors using the decay $\bar{B}^0 \to D^{+} e^{-}$ electron-neutrino

BaBar

Collaboration

Feb, 2006

34 pages

Published in:

Phys.Rev.D 74 (2006) 092004

e-Print:

hep-ex/0602023 [hep-ex]

DOI:

10.1103/PhysRevD.74.092004

PDG:

{{\mathit B}^{0}}

\rightarrow

{{\mathit D}^{*-}}{{\mathit \ell}^{+}}{{\mathit \nu}_{{{{{\mathit \ell}}}}}}

Report number:

SLAC-PUB-11672,
BABAR-PUB-05-052

Experiments:

SLAC-PEP2-BABAR

View in:

reference search62 citations

Citations per year

Abstract: (arXiv)

We measure the dependence of

\bar B^0 \to D^{*+}e^-\bar{\nu}_e

on the decay angles and momentum transfer. The data sample consists of

\sim 86 \times 10^6

B\bar B

-pairs accumulated on the

\Upsilon(4{\rm S})

resonance by the BABAR detector at the asymmetric

e^+ e^-

collider PEP-II. We specify the three form factors by two ratios

R_1

and

R_2

, and by a single parameter

\rho^2

characterizing the polynomial representing

h_{A_1}

, the function which describes the momentum-transfer dependence of the form factor

A_1

. We determine

R_1

,

R_2

, and

\rho^2

using an unbinned maximum likelihood fit to the full decay distribution. The results are

R_1=1.396\pm 0.060\pm 0.035\pm 0.027

,

R_2=0.885\pm 0.040\pm 0.022\pm 0.013

, and

\rho^2=1.145\pm 0.059\pm 0.030\pm 0.035

. The stated uncertainties are the statistical from the data, statistical from the size of the Monte Carlo sample and the systematic uncertainty, respectively. In addition, based on this measurement, we give an updated value for the CKM matrix element

|V_{cb}|

.

Note:

35 pgs, 20 figures. Submitted to Phys Rev D

11.30.Er
12.15.Hh
13.25.Hw
electron positron: colliding beams
electron positron: annihilation
Upsilon(10570): electroproduction
B: pair production
anti-B0: semileptonic decay
D*(2010): hadronic decay
decay: form factor

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