Radiative decays and the nature of heavy quarkonia

Details Radiative decays and the nature of heavy quarkonia Radiative decays and the nature of heavy quarkonia

2005-11-14

arxiv.org/abs/hep-ph/0511167v2

Phys.Rev.Lett.96:111801,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 3 figures. Clarifications introduced, including extra curve in plots. Journal version

Scientific paper

10.1103/PhysRevLett.96.111801

We argue that the photon spectra in radiative decays of various heavy quarkonium states provide important information on their nature. If two of these states are in the strong coupling regime, we are able to produce a parameter-free model independent formula, which holds at next-to-leading order and includes both direct and fragmentation contributions. When the formula is checked against recent CLEO data it favors Upsilon (2S) and Upsilon (3S) in the strong coupling regime and disfavors Upsilon (1S) in it.

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