Braun, V. M. and Khodjamirian, A. (2013) Soft contribution to B -> gamma l nu(l) and the B-meson distribution amplitude. PHYSICS LETTERS B, 718 (3). pp. 1014-1019. ISSN 0370-2693,
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The B -> gamma l nu l decay at large energies of the photon receives a numerically important soft-overlap contribution which is formally of the next-to-leading order in the expansion in the inverse photon energy. We point out that this contribution can be calculated within the framework of heavy-quark expansion and soft-collinear effective theory, making use of dispersion relations and quark-hadron duality. The softoverlap contribution is obtained in a full analogy with the similar contribution to the gamma*gamma -> pi it transition form factor. This result strengthens the case for using the B -> gamma l nu l decay to constrain the B-meson distribution amplitude and determine its most important parameter, the inverse moment lambda(B). (C) 2012 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CONE SUM-RULES; FORM-FACTORS; RESONANCE PHYSICS; RADIATIVE DECAY; LIGHT; QCD; FACTORIZATION; PION; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics Physics > Institute of Theroretical Physics > Chair Professor Braun Physics > Institute of Theroretical Physics > Chair Professor Braun > Group Vladimir Braun |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 28 Apr 2020 07:38 |
| Last Modified: | 28 Apr 2020 07:38 |
| URI: | https://pred.uni-regensburg.de/id/eprint/17296 |
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