Momentum Dependent Vertices $\sigma \gamma \gamma$, $\sigma \rho \gamma$ and $\sigma \rho \rho$ : The NJL Scalar Hidden by Chiral Symmetry

Abstract

We calculate the momentum dependence of three particle vertices $\sigma \gamma \gamma$, $\sigma \rho \gamma$ and $\sigma \rho \rho$ in the context of a Nambu Jona Lasinio type model. We show how they influence the processes $\gamma \gamma \to \sigma \to \pi \pi$, $\rho \to \gamma \sigma$ and $\gamma \gamma \to \rho \rho$ and how chiral symmetry shadows the presence of the $\sigma$.

9 pages (latex), 5 figures available from the authors, preprint Coimbra 940506, IJS-TP-94/10, accepted for publication in Zeit. f. Physik A

References in corpus (2)

• Role of heavy-meson exchange in pion production near threshold
• Strong and Radiative Meson Decays in a Generalized Nambu--Jona-Lasinio Model

Cited by in corpus (4)

• Critical Scattering and Two Photon Spectra for a Quark/Meson Plasma
• Low-energy dynamics of the $\gamma \gamma \to \pi \pi$ reaction
• Two photons decay of the glueball and scalar isoscalar mesons in a scaled NJL model
• Chiral Shielding