Can the gamma-gamma processes reveal the nature of the sigma ?

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dc.creatorMennessier, G.
dc.creatorMinkowski, P.
dc.creatorNarison, S.
dc.creatorOchs, W.
dc.date2007-07-31
dc.date2007-08-01
dc.date.accessioned2026-07-07T08:21:17Z
dc.date.available2026-07-07T08:21:17Z
dc.descriptionWe reanalyse the gamma-gamma scattering data and conclude that in the mass region below 1 GeV the cross section for gamma-gamma to pi^0-pi^0 can be largely explained by the one pion exchange process with pi-pi rescattering. The radiative width of the sigma is estimated and a model dependent separation into contributions from direct gamma-gamma decay and decay through rescattering is obtained. We confront these findings with QCD spectral sum rule (QSSR) predictions and conclude that the sigma can have a large gluonium component in its wave function.
dc.identifierhttps://arxiv.org/abs/0707.4511
dc.identifierhttp://arxiv.org/abs/0707.4511
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/135312
dc.subjectHigh Energy Physics - Phenomenology
dc.titleCan the gamma-gamma processes reveal the nature of the sigma ?
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