Effects of an extra U(1) axial condensate on the strong decays of pseudoscalar mesons

Details Effects of an extra U(1) axial condensate on the strong decays of pseudoscalar mesons Effects of an extra U(1) axial condensate on the strong decays of pseudoscalar mesons

2010-10-06

arxiv.org/abs/1010.1140v3

Phys.Rev.D83:074007,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

Completely revised version; 46 pages, 1 table

Scientific paper

10.1103/PhysRevD.83.074007

We consider a scenario (supported by some lattice results) in which a U(1)-breaking condensate survives across the chiral transition in QCD. This scenario has important consequences for the pseudoscalar-meson sector, which can be studied using an effective Lagrangian model. In particular, generalizing the results obtained in two previous papers, where the effects on the radiative decays eta,eta' --> gamma gamma were studied, in this paper we study the effects of the U(1) chiral condensate on the strong decays of the "light" pseudoscalar mesons, i.e., eta,eta' --> 3pi^0; eta,eta' --> pi^+ pi^- pi^0; eta' --> eta pi^0 pi^0; eta' --> eta pi^+ pi^-; and also on the strong decays of an exotic ("heavy") SU(3)-singlet pseudoscalar state eta_X, predicted by the model.

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