Obtaining sigma --> gamma gamma Width from Nucleon Polarizabilities

Details Obtaining sigma --> gamma gamma Width from Nucleon Polarizabilities Obtaining sigma --> gamma gamma Width from Nucleon Polarizabilities

2008-09-15

arxiv.org/abs/0809.2475v1

Nucl.Phys.Proc.Suppl.186:279-282,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, 1 figure, Invited Talk given by J.P. at 14th International Conference on QCD (QCD' 08), 7-12 July 2008, Montpellier,

Scientific paper

10.1016/j.nuclphysbps.2008.12.06

We propose a new method that fixes the coupling to two photons of the recently found lightest QCD resonance, the sigma. This coupling provides crucial information for discriminating the yet unknown nature of this special state. Our method uses available data on the nucleon polarizabilities together with analyticity and unitarity. Taking into account all the uncertainties, our result is Gamma_{pole}= 1.2 +- 0.4 keV.

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