The sigma -> gamma gamma Width from Nucleon Electromagnetic Polarizabilities

Simple item page
dc.creatorBernabeu, Jose
dc.creatorPrades, Joaquim
dc.date2008-02-13
dc.date2008-05-28
dc.date.accessioned2026-07-07T11:40:16Z
dc.date.available2026-07-07T11:40:16Z
dc.descriptionThe lightest QCD resonance, the sigma, has been recently fixed in the pi-pi scattering amplitude. The nature of this state remains nowadays one of the most intriguing and difficult issues in particle physics. Its coupling to photons is crucial to discriminate its structure. We propose a new method that fixes this coupling using only available precise experimental data on the proton electromagnetic polarizabilities together with analyticity and unitarity. Taking into account the uncertainties in the analysis and in the parameter values, our result is Gamma_{pole}(sigma -> gamma gamma) = (1.2 +- 0.4) KeV.
dc.description9 pages, 1 figure. v2: Matches published version. v3: Small errata in Eq. (3) corrected
dc.identifierhttps://arxiv.org/abs/0802.1830
dc.identifierhttp://arxiv.org/abs/0802.1830
dc.identifierPhys.Rev.Lett.100:241804,2008
dc.identifierdoi:10.1103/PhysRevLett.100.241804
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/200204
dc.subjectHigh Energy Physics - Phenomenology
dc.titleThe sigma -> gamma gamma Width from Nucleon Electromagnetic Polarizabilities
dc.typetext

Files

Collections

arXiv