Soft Photon Spectrum in Orthopositronium and Vector Quarkonium Decays

Abstract

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.

arXiv commentLaTeX, 10 pages

References in corpus (10)

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Cited by in corpus (6)

• Dynamic Properties of Charmonium
• The Orthopositronium Decay Spectrum using NRQED
• Positronium Decay into a Photon and Neutrinos
• Two-photon decay of P-wave positronium: a tutorial
• Gauge invariant formulation of 3$\gamma$ decay of particle-antiparticle bound states
• A New Basis for QED Bound State Computations