TITLE

# Soft contribution to Bâ†’Î³â„“Î½â„“ from dispersion relations and duality

AUTHOR(S)
Braun, V. M.; Khodjamirian, A.
PUB. DATE
October 2012
SOURCE
AIP Conference Proceedings;Oct2012, Vol. 1492 Issue 1, p95
SOURCE TYPE
DOC. TYPE
Article
ABSTRACT
The decay Bâ†’Î³â„“Î½â„“ receives a numerically large soft-overlap contribution which is formally next-to-leading order in the expansion in the inverse photon energy, 1/EÎ³. We point out that this contribution can be calculated with little model-dependence making use of dispersion relations and duality, in full analogy with the similar contribution to the Î³Î³*â†’Ï€ transition form factor. This result strengthens the case for the utility of the Bâ†’Î³â„“Î½â„“ decay for constraining the B-meson distribution amplitude and determining its most important parameter, the inverse moment Î»B.
ACCESSION #
82762885

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