Analytical Behaviour of Positronium Decay Amplitudes

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dc.creatorCastro, G. Lopez
dc.creatorPestieau, J.
dc.creatorSmith, C.
dc.creatorTrine, S.
dc.date2000-06-01
dc.date.accessioned2026-07-07T03:41:37Z
dc.date.available2026-07-07T03:41:37Z
dc.descriptionPositronium annihilation amplitudes that are computed by assuming a factorization approximation with on-shell intermediate leptons do not exhibit good analytical behaviour. Using dispersion techniques, we find new contributions that interfere with the known results to restore analytical properties. Those new amplitudes which cannot be obtained using standard factorized amplitude formalism, contribute at order alpha^2. Therefore they have to be evaluated before any theoretical conclusion can be drawn upon the orthopositronium lifetime puzzle.
dc.descriptionLaTeX, 22 pages, 3 eps figures
dc.identifierhttps://arxiv.org/abs/hep-ph/0006018
dc.identifierhttp://arxiv.org/abs/hep-ph/0006018
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/39647
dc.subjectHigh Energy Physics - Phenomenology
dc.titleAnalytical Behaviour of Positronium Decay Amplitudes
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