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The effects of an extra U(1) axial condensate on the radiative decay eta' --> gamma gamma at finite temperature

E. Meggiolaro
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Abstract

Supported by recent lattice results, we consider a scenario in which a U(1)-breaking condensate survives across the chiral transition in QCD. This scenario has important consequences on the pseudoscalar-meson sector, which can be studied using an effective Lagrangian model. In particular, generalizing the results obtained in a previous paper (where the zero-temperature case was considered), we study the effects of this U(1) chiral condensate on the radiative decay eta' --> gamma gamma at finite temperature.

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E. Meggiolaro. 2003-10-30. The effects of an extra U(1) axial condensate on the radiative decay eta' --> gamma gamma at finite temperature. https://doi.org/10.1103/physrevd.69.074017

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