Chiral perturbation theory versus vector meson dominance in the decays φ → ϱγγ and φ → ωγγ

Equivalence Between Vector Meson Dominance and Unitarised Chiral Perturbation Theory

It is explicitly shown that the solution of the integral equation for the inverse of the form factor or the Padé approximant method to resum the one loop Chiral Perturbation Theory (CPTH) are equivalent to the standard vector meson dominance (VMD) models using the vector meson coupling to two pseudoscalars given by the KSRF relation. Inconsistencies between the one loop CPTH and its unitarised ...

Vector Meson Masses in Chiral Perturbation Theory

We discuss the vector meson masses within the context of Chiral Perturbation Theory performing an expansion in terms of the momenta, quark masses and 1/Nc. We extend the previous analysis to include isospin breaking effects and also include up to order p. We discuss vector meson chiral perturbation theory in some detail and present a derivation from a relativistic lagrangian. The unknown coeffi...

Electroproduction of the φ ( 1020 ) Vector Meson

We studied the reaction ep → e′p′φ with a 4.2 GeV incident electron beam in the region of the electroproduction variables Q from 0.7 to 2.2 GeV and W from 2.0 to 2.6 GeV. The data were taken and analyzed at the Thomas Jefferson National Accelerator Facility. For the first time, we observe the expected t-slope dependence on Q and ∆τ in φ vector meson production. We find that the width of the for...

The Φ → Π + Π − and Φ Radiative Decays within a Chiral Unitary Approach

φ-meson in Nuclear Matter

φ-meson mass in nuclear matter (m∗φ) is investigated using an effective Lagrangian of φ interacting with octet baryons. m∗φ decreases by a few % in nuclear matter due to the current conservation and effective nucleon/hyperon masses. Its implication to the p-A and A-A collisions are briefly discussed. Submitted to Prog. Theor. Phys.