Calculation of the two-photon decay width of the f_0(980) scalar meson

Simple item page
dc.creatorLemmer, R. H.
dc.date2007-01-04
dc.date2007-11-21
dc.date.accessioned2026-07-07T11:22:27Z
dc.date.available2026-07-07T11:22:27Z
dc.descriptionThe applicability of the quasi-static approximation for calculating the two-photon annihilation rate of the scalar f_0(980) meson envisaged as a K\bar K molecule is critically re-examined. It is shown that the validity of this approximation depends on the detailed interplay between the momentum dependence of the annihilation amplitude and the momentum transform of the bound state wave function of the annihilating pair. The approximation becomes invalid when these two scales of variation are similar. An improved method of calculation based on the inclusion of electromagnetic corrections to the kernel of the Bethe-Salpeter equation for the interacting K\bar K pair is outlined to cover this case and applied to re-evaluate the two-photon decay width for f_0(980) in a one boson exchange model for the interkaon interaction. The corrections are significant and result in a much better agreement with experiment.
dc.description14 pages, 3 figures. Fig.3 replaced. Additional remarks with references
dc.identifierhttps://arxiv.org/abs/hep-ph/0701027
dc.identifierhttp://arxiv.org/abs/hep-ph/0701027
dc.identifierPhys.Lett.B650:152-158,2007
dc.identifierdoi:10.1016/j.physletb.2007.03.071
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/194571
dc.subjectHigh Energy Physics - Phenomenology
dc.titleCalculation of the two-photon decay width of the f_0(980) scalar meson
dc.typetext

Files

Collections

arXiv