Determination of the form-factors for the decay $B^0 \to D^{*-} \ell^{+} \nu_{l}$ and of the CKM matrix element $|V_{cb}|$ - INSPIRE

DataBETA

Determination of the form-factors for the decay $B^0 \to D^{*-} \ell^{+} \nu_{l}$ and of the CKM matrix element $|V_{cb}|$

BaBar

Collaboration

May, 2007

18 pages

Published in:

Phys.Rev.D 77 (2008) 032002

e-Print:

0705.4008 [hep-ex]

DOI:

10.1103/PhysRevD.77.032002

PDG:

{{\mathit B}^{0}}

\rightarrow

{{\mathit D}^{*}{(2010)}^{-}}{{\mathit \ell}^{+}}{{\mathit \nu}_{{{{{\mathit \ell}}}}}}

Report number:

SLAC-PUB-12511,
BABAR-PUB-07-008

Experiments:

SLAC-PEP2-BABAR

View in:

reference search124 citations

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Abstract: (arXiv)

We present a combined measurement of the Cabibbo-Kobayashi-Maskawa matrix element |V_{cb}| and of the parameters rho^2, R_1(1), and R_2(1), which fully characterize the form factors for the B0 -> D*- l+ nu_l decay in the framework of heavy-quark effective theory. The results, based on a selected sample of about 52,800 B0 -> D*- l+ nu_l decays, recorded by the BaBar detector, are rho2=1.157+-0.094+-0.027, R_1(1)=1.327+-0.131+-0.043, R_2(1)=0.859+-0.077+-0.021, and F(1)|V_cb|=(34.7+-0.4+-1.0)x10^-3. The first error is the statistical and the second is the systematic uncertainty. Combining these measurements with the previous BaBar measurement of the form factors, which employs a different fit technique on a partial sample of the data, we improve the statistical precision of the result, rho2=1.191+-0.048+-0.028, R_1(1)=1.429+-0.061+-0.044, R_2(1)=0.827+-0.038+-0.022, and F(1)|V_cb| = (34.4+-0.3+-1.1)x10^-3. Using lattice calculations for the axial form factor

\mathcal{F}(1)

, we extract |V_cb| =(37.4+-0.3+-1.2+1.2-1.4)x10^-3, where the third error is due to the uncertainty in F(1). We also present a measurement of the exclusive branching fraction, B = (4.69+-0.04+-0.34)%.

Note:

18 pages, 7 postscript figures

11.30.Er
13.25.Hw
12.15.Hh
electron positron: colliding beams
electron positron: annihilation
Upsilon(10570): electroproduction
B: pair production
B0: semileptonic decay
B0: branching ratio
D*(2010)

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