The gV sigma gamma coupling constants in hadron electrodynamics


Creative Commons License

Rekalo M., Tomasi-Gustafsson E.

NUCLEAR PHYSICS A, cilt.725, ss.116-126, 2003 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 725
  • Basım Tarihi: 2003
  • Doi Numarası: 10.1016/s0375-9474(03)01605-1
  • Dergi Adı: NUCLEAR PHYSICS A
  • Sayfa Sayıları: ss.116-126

Özet

Recent measurements of the branching ratios for the decays omega --> pi(0) pi(0)gamma and rho(0) --> pi(0)pi(0)gamma lead to coupling constants of the Vsigmagamma interaction (V is a vector meson) one order of magnitude smaller than previously assumed to describe the threshold cross section of gamma + p --> p + rho(0) and the HERMES effect. The new g(Vsigmagamma)(2) a couplings are in contradiction with the predictions of the QCD sum rules, but are in agreement with vector meson dominance estimation of the sigma --> gammagamma width. (C) 2003 Elsevier B.V. All rights reserved.