Abstract |
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[eng] 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.
Comment: LaTeX, 10 pages |