On the expected photon spectrum in B --> X + gamma and its uses - INSPIRE

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On the expected photon spectrum in B --> X + gamma and its uses

Ikaros Bigi
(
- Notre Dame U.
)
,
Nikolai Uraltsev
(
- Notre Dame U. and
- INFN, Milan and
- St. Petersburg, INP
)

Feb, 2002

19 pages

Part of The CKM Matrix and the Unitarity Triangle. Proceedings, Workshop13-16 Feb 2002 CERN, Geneva, Switzerland,

Published in:

Int.J.Mod.Phys.A 17 (2002) 4709-4732

Contribution to:

Workshop on CKM Unitarity Triangle (CERN 2002-2003)

e-Print:

hep-ph/0202175 [hep-ph]

DOI:

10.1142/S0217751X02010856

Report number:

UND-HEP-02-BIG06,
BICOCCA-FT-02-2

View in:

ADS Abstract Service

reference search43 citations

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Abstract:

Measuring the photon energy spectrum in radiative B decays provides essential help for gaining theoretical control over semileptonic B transitions. The hadronic recoil mass distribution in B -> X_u \ell\nu promises the best environment for determining |V_ub|. The theoretical uncertainties are largest in the domain of low values of the lepton pair mass q^2. Universality relations allow to describe this domain reliably in terms of the photon spectrum in B -> X_s + \gamma. A method is proposed to incorporate 1/m_b corrections into this relation. The low-E_\gamma tail in radiative decays is important in the context of extracting |V_ub|. We argue that CLEO's recent fit to the spectrum underestimates the fraction of the photon spectrum below 2 GeV. Potentially significant uncertainties enter in the theoretical evaluation of the integrated end-point lepton spectrum or the B -> X_u \ell\nu width with a too high value of the lower cut on q^2 in alternative approaches to |V_ub|.

talk: Geneva 2002/02/13
B: radiative decay
photon: energy spectrum
perturbation theory
form factor: Sudakov
B: semileptonic decay
CKM matrix matrix
hadron: mass spectrum
B: width
differential cross section

References(23)

Figures(0)

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Ikaros I.Y. Bigi
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(
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)
,
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)
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)

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Ikaros I.Y. Bigi
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)
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)

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Ikaros I.Y. Bigi
(
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)
,
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(
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)
,
Mikhail A. Shifman
(
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)
,
N.G. Uraltsev
(
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)
,
Arkady I. Vainshtein
(
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)

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Ikaros I.Y. Bigi
(
- Notre Dame U.
)
,
Nikolai Uraltsev
(
- Notre Dame U. and
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- St. Petersburg, INP
)

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•
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)
,
N.G. Uraltsev
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)

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•
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The Hadronic recoil mass spectrum in semileptonic B decays and extracting |V(ub)| in a model insensitive way

Ikaros I.Y. Bigi
(
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)
,
R.D. Dikeman
(
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)
,
N. Uraltsev
(
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- St. Petersburg, INP
)

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Ikaros I.Y. Bigi
(
- Notre Dame U.
)
,
Mikhail A. Shifman
(
- Minnesota U.
)
,
N. Uraltsev
(
- Notre Dame U. and
- Minnesota U. and
- CERN and
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)
,
Arkady I. Vainshtein
(
- Minnesota U. and
- Novosibirsk, IYF
)

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•
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Christian W. Bauer
(
- UC, San Diego
)
,
Zoltan Ligeti
(
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)
,
Michael E. Luke
(
- LBL, Berkeley and
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)

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CLEO

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Ikaros I.Y. Bigi
(
- CERN and
- Notre Dame U.
)
,
N.G. Uraltsev
(
- CERN and
- St. Petersburg, INP
)

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•
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M.B. Voloshin
(
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)

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•
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•
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