Agaev, S. S. and Braun, V. M. and Offen, N. and Porkert, F. A. (2011) Light cone sum rules for the pi(0)gamma*gamma form factor revisited. PHYSICAL REVIEW D, 83 (5): 054020. ISSN 2470-0010, 2470-0029
Full text not available from this repository.Abstract
We provide a theoretical update of the calculations of the pi(0)gamma*gamma form factor in the light cone sum rules framework, including up to six polynomials in the conformal expansion of the pion distribution amplitude and taking into account twist-six corrections related to the photon emission at large distances. The results are compared with the calculations of the B -> pi l nu decay and pion electromagnetic form factors in the same framework. Our conclusion is that the recent BABAR measurements of the pi(0)gamma*gamma form factor at large momentum transfers [B. Aubert et al. (The BABAR Collaboration), Phys. Rev. D 80, 052002 (2009)] are consistent with QCD, although they do suggest that the pion distribution amplitude may have more structure than usually assumed.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PION DISTRIBUTION AMPLITUDE; ASTERISK-B-PI; EXCLUSIVE PROCESSES; PERTURBATIVE QCD; QUANTUM CHROMODYNAMICS; WAVE-FUNCTION; ASYMPTOTIC-BEHAVIOR; EVOLUTION-EQUATIONS; RESONANCE PHYSICS; LEADING ORDER; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Braun > Group Vladimir Braun |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 24 Jun 2020 05:38 |
| Last Modified: | 24 Jun 2020 05:38 |
| URI: | https://pred.uni-regensburg.de/id/eprint/21116 |
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