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Open Access item Obtaining sigma -> gamma gamma Width from Nucleon Polarizabilities

Authors:Bernabéu, José
Prades, Joaquim
Issue Date:Jan-2009
Publisher:Elsevier
Citation:Nuclear Physics - Section B-PS - Proceedings Supplements 186: 279-282 (2009)
Abstract: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.
Publisher version (URL):http://dx.doi.org/ 10.1016/j.nuclphysbps.2008.12.062
URI:http://hdl.handle.net/10261/21405
ISSN:0920-5632
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Appears in Collections:(IFIC) Comunicaciones congresos

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