Desiderio, A. and Frezzotti, R. and Garofalo, M. and Giusti, Davide and Hansen, M. and Lubicz, V and Martinelli, G. and Sachrajda, C. T. and Sanfilippo, F. and Simula, S. and Tantalo, N. (2021) First lattice calculation of radiative leptonic decay rates of pseudoscalar mesons. PHYSICAL REVIEW D, 103 (1): 014502. ISSN 2470-0010, 2470-0029
Full text not available from this repository.Abstract
We present a nonperturbative lattice calculation of the form factors which contribute to the amplitudes for the radiative decays P -> l (v) over bar (l gamma), where P is a pseudoscalar meson and l is a charged lepton. Together with the nonperturbative determination of the corrections to the processes P -> l (v) over bar (l),= due to the exchange of a virtual photon, this allows accurate predictions at O(alpha(em)) to be made for leptonic decay rates for pseudoscalar mesons ranging from the pion to the D-s meson. We are able to separate unambiguously and nonpertubatively the pointlike contribution, from the structure-dependent, infrared-safe, terms in the amplitude. The fully nonperturbative O(alpha) improved calculation of the inclusive leptonic decay rates will lead to the determination of the corresponding Cabibbo-Kobayashi-Maskawa matrix elements also at O(alpha(em)). Prospects for a precise evaluation of leptonic decay rates with emission of a hard photon are also very interesting, especially for the decays of heavy D and B mesons for which currently only modeldependent predictions are available to compare with existing experimental data.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | FORM-FACTORS |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 13 Sep 2022 09:29 |
| Last Modified: | 23 Apr 2024 15:43 |
| URI: | https://pred.uni-regensburg.de/id/eprint/47978 |
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