The sigma -> gamma gamma Width from Nucleon Electromagnetic Polarizabilities

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

2008-02-13

arxiv.org/abs/0802.1830v3

Phys.Rev.Lett.100:241804,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 1 figure. v2: Matches published version. v3: Small errata in Eq. (3) corrected

Scientific paper

10.1103/PhysRevLett.100.241804

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.

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