Soft Photon Spectrum in Orthopositronium and Vector Quarkonium Decays

Details Soft Photon Spectrum in Orthopositronium and Vector Quarkonium Decays Soft Photon Spectrum in Orthopositronium and Vector Quarkonium Decays

2001-11-21

arxiv.org/abs/hep-ph/0111264v1

Phys.Lett. B524 (2002) 395-399

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX, 10 pages

Scientific paper

10.1016/S0370-2693(01)01406-X

QED gauge invariance, when combined with analyticity, leads to constraints on the low energy end of the emitted photon spectra. This is known as Low's theorem. It is shown that the Ore-Powell result, as well as further developments for the orthopositronium differential decay rate, are in contradiction with Low's theorem, i.e. that their predicted soft photon spectra are incorrect. A solution to this problem is presented. The implications for the orthopositronium lifetime puzzle, the charmonium rho-pi puzzle, the prompt photon spectrum in inclusive quarkonium decays and the extraction of alpha_S from quarkonium annihilation rates are briefly commented.

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