The sigma --> gamma gamma Width from Nucleon Electromagnetic Polarizabilities
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The sigma --> gamma gamma Width from Nucleon Electromagnetic Polarizabilities

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The sigma --> gamma gamma Width from Nucleon Electromagnetic Polarizabilities

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dc.contributor.author Bernabeu Alberola, José
dc.contributor.author Prades Hernández, Joaquim
dc.date.accessioned 2016-05-04T08:05:18Z
dc.date.available 2016-05-04T08:05:18Z
dc.date.issued 2008
dc.identifier.uri http://hdl.handle.net/10550/53358
dc.description.abstract The 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.language.iso eng
dc.relation.ispartof Physical Review Letters, 2008, vol. 100, num. 24, p. 241804
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source Bernabeu Alberola, José; Prades Hernández, Joaquim (2008) The sigma --> gamma gamma Width from Nucleon Electromagnetic Polarizabilities Physical Review Letters 100 24 241804
dc.subject Física
dc.title The sigma --> gamma gamma Width from Nucleon Electromagnetic Polarizabilities
dc.type info:eu-repo/semantics/article
dc.date.updated 2016-05-04T08:05:18Z
dc.identifier.doi http://dx.doi.org/10.1103/PhysRevLett.100.241804
dc.identifier.idgrec 051207

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