6533b7d2fe1ef96bd125dd39

RESEARCH PRODUCT

Obtaining sigma --> gamma gamma Width from Nucleon Polarizabilities

José BernabéuJoaquim Prades

subject

High Energy Physics - PhenomenologyFísica

description

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.

yearjournalcountryeditionlanguage
2008-09-15
10.1016/j.nuclphysbps.2008.12.062http://arxiv.org/abs/0809.2475