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Two-photon decay width of the sigma meson

Author:
Giacosa, Francesco   Gutsche, Thomas   Lyubovitskij, Valery E.  


Journal:
Physical Review D


Issue Date:
2008


Abstract(summary):

We shortly report on the two-photon decay width of the light sigma-meson interpreted as a quarkonium state. Results are given in dependence on the sigma-mass and the constituent mass of the light quark. The triangle quark-loop diagram, responsible for the two-photon transition, is carefully evaluated: a term in the transition amplitude, often omitted in literature, results in destructive interference with the leading term. As a result we show that the two-photon decay width of the sigma in the quarkonium picture is less than 1 keV for the physical range of parameters.


Page:
034007


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