Braun, V. M. and Manashov, A. N. and Offen, N. (2015) Evolution equation for the higher twist B-meson distribution amplitude. PHYSICAL REVIEW D, 92 (7): 074044. ISSN 1550-7998, 1550-2368
Full text not available from this repository.Abstract
We find that the evolution equation for the three-particle quark-gluon B-meson light-cone distribution amplitude (DA) of subleading twist is completely integrable in the large N-c limit and can be solved exactly. The lowest anomalous dimension is separated from the remaining, continuous spectrum by a finite gap. The corresponding eigenfunction coincides with the contribution of quark-gluon states to the two-particle DA phi_(omega) so that the evolution equation for the latter is the same as for the leading-twist DA phi(+)(omega) up to a constant shift in the anomalous dimension. Thus, "genuine" three-particle states that belong to the continuous spectrum effectively decouple from phi_(omega) to the leading-order accuracy. In turn, the scale dependence of the full three-particle DA turns out to be nontrivial so that the contribution with the lowest anomalous dimension does not become leading at any scale. The results are illustrated on a simple model that can be used in studies of 1/m(b) corrections to heavy-meson decays in the framework of QCD factorization or light-cone sum rules.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | QCD FACTORIZATION; FORM-FACTORS; HEAVY-QUARK; SUM-RULES; SYMMETRY; DECAYS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics Physics > Institute of Theroretical Physics > Chair Professor Braun > Group Vladimir Braun |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 09 May 2019 11:54 |
| Last Modified: | 09 May 2019 11:54 |
| URI: | https://pred.uni-regensburg.de/id/eprint/4588 |
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