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Two-photon decays of mesons in a relativistic quark model

✍ Scribed by Claus R. Münz

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
707 KB
Volume
609
Category
Article
ISSN
0375-9474

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✦ Synopsis

We present a relativistic calculation of two-photon decays for heavy and light mesons in the framework of the Salpeter equation for quark-antiquark states. The meson-photon-photon vertex is computed by reconstructing the Bethe-Salpeter vertex function and evaluating the fourdimensional Feynman diagram with off-shell quark amplitudes.

The two-photon width for light and heavy quarkonia up to spin equal six are calculated with various parameter sets taken from the literature thus giving a complete overview on mesonic two-photon physics. We find that relativistic effects including the negative-energy components of the wave function are important for any two-photon width -even for heavy quarkonia -yielding a remarkable agreement with available data as well as predictions for future experiments.

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