Hidden gauge formalism for the radiative decays of axial-vector mesons

Abstract

The radiative decay of the axial-vector resonances into a pseudoscalar meson and a photon is studied using the vector meson Lagrangian obtained from the hidden gauge symmetry (HGS) formalism. The formalism is well suited to study this problem since it deals with pseudoscalar and vector mesons in a unified way, respecting chiral invariance. We show explicitly the gauge invariance of the set of diagrams that appear in the approach and evaluate the radiative decay width of the a1(1260) and b1(1235) axial vector meson resonances into pi gamma. We also include the contribution of loops involving anomalous couplings and compare the results to those obtained previously within another formalism.

24 pages, 6 tables, 11 figures

References in corpus (16)

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Cited by in corpus (3)

• The ρρinteraction in the hidden gauge formalism and the f_0(1370) and f_2(1270) resonances
• Isospin breaking effects in the X(3872) resonance
• Scalar, axial-vector and tensor resonances from the rho D^*, omega D^* interaction in the hidden gauge formalism