Kroll, P. (2011) The form factors for the photon to pseudoscalar meson transitions-an update. EUROPEAN PHYSICAL JOURNAL C, 71 (4): 1623. ISSN 1434-6044, 1434-6052
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The form factors for the transitions pi gamma, eta gamma, eta'gamma and eta(c)gamma are analyzed within the modified perturbative approach in which quark transverse degrees of freedom are retained. The results for the form factors are compared to experiment in detail. As compared to previous calculations within the same approach only little modifications of the meson distribution amplitudes are required in general in order to achieve reasonable agreement with experiment. Only for the pi gamma form factor a strong contribution from the second Gegenbauer term is found. It also commented on the case of two virtual photons and on the transition form factors in the time-like region.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PION DISTRIBUTION AMPLITUDE; GAMMA-GAMMA-ASTERISK; RARE DECAYS P; EXCLUSIVE PROCESSES; PERTURBATIVE APPROACH; SUDAKOV SUPPRESSION; TRANSVERSE-MOMENTUM; HEAVY MESONS; QCD; ANNIHILATION; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 23 Jun 2020 05:00 |
| Last Modified: | 23 Jun 2020 05:00 |
| URI: | https://pred.uni-regensburg.de/id/eprint/20969 |
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