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The gVσγ coupling constants in hadron electrodynamics

✍ Scribed by Michail P. Rekalo; Egle Tomasi-Gustafsson

Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
170 KB
Volume
725
Category
Article
ISSN
0375-9474

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✦ Synopsis

Recent measurements of the branching ratios for the decays ω → π 0 π 0 γ and ρ 0 → π 0 π 0 γ lead to coupling constants of the V σ γ interaction (V is a vector meson) one order of magnitude smaller than previously assumed to describe the threshold cross section of γ + p → p + ρ 0 and the HERMES effect. The new g 2 V σ γ couplings are in contradiction with the predictions of the QCD sum rules, but are in agreement with vector meson dominance estimation of the σ → γ γ width.

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