Radiative Decays of Heavy Mesons and the Determination of the Strong g-Coupling
Abstract
The strong g-coupling characterizes the interaction of heavy mesons with pions in typical vertices H*Hπ , H*H*π , where (H*;H) stands for vector and pseudoscalar (B*;B) or (D*;D) heavy mesons. Its estimation by different theoretical methods has led to a wide range of possible values. We describe a new approach to the determination of g, which exploits the rare radiative decays B*→ Bγ γ and D*→ Dγ γ . It is shown that the branching ratio of D*→ Dγ γ can be expressed as a function of a single unknown g and we calculate it to be in the measurable range between 1.6 x 10-6 and 3.3 x 10-5 for 0.25 < g < 1.
- Publication:
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Acta Physica Polonica B
- Pub Date:
- December 1999
- DOI:
- 10.48550/arXiv.hep-ph/9910558
- arXiv:
- arXiv:hep-ph/9910558
- Bibcode:
- 1999AcPPB..30.3849S
- Keywords:
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- High Energy Physics - Phenomenology
- E-Print:
- Lecture presented at the XXXIX Cracow School of Theoretical Physics, May 29-June 8, 1999, Zakopane, Poland