A role of the axial-vector mesons on the photon production in heavy-ion collisions and their relevant decays
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A role of the axial-vector mesons, such as K1 and a1, on the emitted-photon spectrum in hot hadronic matter is studied through the channels πρ→a1→πγ and Kρ→K1→Kγ. Both channels could be dominant over the region lower than Eγ∼ 0.5 GeV, while the role of the K1 meson is diminished in the higher Eγ region. This study is carried out with an SUL(3) ⊗SUR(3) effective chiral Lagrangian which includes vector and axial-vector mesons systematically and explains well their hadronic and radiative decays simultaneously.
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