Model-independent description of B ---> pi l nu decays and a determination of |V(ub)| - INSPIRE

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Model-independent description of B ---> pi l nu decays and a determination of |V(ub)|

Claude Bourrely
(
- Marseille, CPT
)
,
Irinel Caprini
(
- Bucharest, IFIN-HH
)
,
Laurent Lellouch
(
- Marseille, CPT
)

Jul, 2008

15 pages

Published in:

Phys.Rev.D 79 (2009) 013008,
Phys.Rev.D 82 (2010) 099902 (erratum)

e-Print:

0807.2722 [hep-ph]

DOI:

Report number:

CPT-P36-2007

View in:

reference search493 citations

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Abstract: (arXiv)

We propose a new parametrization of the

B\to\pi

vector form factor,

f_+(q^2)

, as an expansion in powers of a conformal mapping variable, which satisfies unitarity, analyticity and perturbative QCD scaling. The unitarity constraint is used also for defining the systematic error of the expansion. We fit with the new parametrization the available experimental and theoretical information on exclusive

B\to\pi l\nu

decays, making a conservative estimate of the effects of correlations in the systematic and statistical errors of the lattice results. With four parameters to describe

f_+(q^2)

, the systematic error is negligible in the whole semileptonic region. We also obtain

|V_{ub}|=(3.54 \pm 0.30) \times 10^{-3}

where, in our approach, the uncertainty is predominantly statistical.

12.15.Hh
13.20.He
B: semileptonic decay
decay: form factor
form factor: vector
parametrization
analytic properties
Kobayashi-Maskawa model: (beauty n p)
error
numerical calculations

References(48)

Figures(5)

Model-independent description of B ---> pi l nu decays and a determination of |V(ub)|

Claude Bourrely
(
- Marseille, CPT
)
,
Irinel Caprini
(
- Bucharest, IFIN-HH
)
,
Laurent Lellouch
(
- Marseille, CPT
)

- Phys.Rev.D 79 (2009) 013008,
- Phys.Rev.D 82 (2010) 099902 (erratum)
•
e-Print:
- 0807.2722
•
DOI:
- 10.1103/PhysRevD.82.099902

A Precision model independent determination of |V(ub)| from B ---> pi e nu

M.Christian Arnesen
(
- MIT, LNS
)
,
Benjamin Grinstein
(
- UC, San Diego
)
,
Ira Z. Rothstein
(
- Carnegie Mellon U.
)
,
Iain W. Stewart
(
- MIT, LNS
)

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•
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- hep-ph/0504209
•
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Extracting |V(ub)| from B ---> pi l nu decays using a multiply-subtracted Omnes dispersion relation

Jonathan M Flynn
(
- Southampton U.
)
,
Juan Nieves
(
- Granada U.
)

- Phys.Rev.D 75 (2007) 013008
•
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- hep-ph/0607258
•
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Jonathan M. Flynn
(
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)
,
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(
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)

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•
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A. Khodjamirian
(
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)
,
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)
,
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)
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)

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G. Duplancic
(
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)
,
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)
,
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)
,
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)
,
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)

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(
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)
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)
,
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(
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)
,
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- Utah U.
)
,
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(
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)

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Masataka Okamoto
(
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)

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Fermilab Lattice and
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(
- Ohio State U.
)
,
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(
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)
,
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(
- Washington U., Seattle
)
,
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(
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)
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- Cornell U., LEPP
)

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G.Peter Lepage
(
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)
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(
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)

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R. Akhoury
(
- Michigan U.
)
,
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(
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)
,
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(
- Michigan U.
)

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(
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)

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Damir Becirevic
(
- Rome U. and
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)
,
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(
- Moscow, ITEP and
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