The problem of the U(1) axial symmetry and the chiral transition in QCD

Details The problem of the U(1) axial symmetry and the chiral transition in QCD The problem of the U(1) axial symmetry and the chiral transition in QCD

2003-09-18

arxiv.org/abs/hep-ph/0309214v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk given at the ``10th High-Energy Physics International Conference in Quantum Chromo-Dynamics'' (QCD 03), Montpellier (Fran

Scientific paper

10.1016/j.nuclphysbps.2004.04.17

We discuss the role of the U(1) axial symmetry for the phase structure of QCD at finite temperature. In particular, supported by recent lattice results, we analyse a scenario in which a U(1)-breaking condensate survives across the chiral transition. This scenario can be consistently reproduced using an effective Lagrangian model. The effects of the U(1) chiral condensate on the slope of the topological susceptibility in the full theory with quarks are studied. Further information on the new U(1) chiral order parameter is derived from the study (at zero temperature) of the radiative decays of the light pseudoscalar mesons in two photons.

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