Radiative decays and the nature of heavy quarkonia

Abstract

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.

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

References in corpus (2)

• Effective field theories for heavy quarkonium
• Semi-inclusive radiative decays of Upsilon 1S

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