Radiative decay intoγPof the low lying axial-vector mesons

Abstract

We evaluate the radiative decay into a pseudoscalar meson and a photon of the whole set of the axial-vector mesons dynamically generated from the vectorpseudoscalar meson (V P ) interaction. We take into account tree level and loop diagrams coming from the axial-vector decay into a vector and a pseudoscalar meson. We find a large span for the values of the radiative widths of the different axial-vector mesons. In particular, we evaluate the radiative decay into Kγ of the two K 1 (1270) states, recently claimed theoretically, and discuss the experimental values quoted so far on the assumption of only one state.

Regge phenomenology in π0 and η photoproduction

“…For the b 1 meson only the electromagnetic width for the charged decay Γ b1→π ± γ = 227 keV is known [19]. We use this value to calculate λ b1 for the neutral decay as well, because chiral unitary models predict practically the same electromagnetic couplings of the b 1 meson for both charged and neutral pion decays [20]. Unfortunately there are no data for the decay b 1 → ηγ.…”

S-waveKK*interactions in a finite volume and thefGeng1, Ren2, Zhou3 et al. 2015Phys. Rev. D292330View full textAdd to dashboardCite

“…In recent years, however, it has been suggested to be a dynamically generated state made from the KK * interaction, together with its axial-vector counterparts [2,3]. Such a picture has been extensively tested in the past decade [4][5][6][7][8][9][10][11][12][13][14]. All these studies yield consistent results that the ground-state axial-vector mesons can be understood as dynamically generated states or at least contain large pseudoscalar meson-vector meson components.…”

Meson loops in the f0(980) and a0(980) radiative decays into ρ , ω

“…[28,15] in the evaluation of the radiative φ decay and in refs. [29,30] for the radiative axial-vector meson decays.…”