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

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

2002-04-26

arxiv.org/abs/hep-ph/0204312v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk given at the ``Workshop on Quark-Gluon Plasma and Relativistic Heavy Ions'', Frascati (Italy), January 14th-18th, 2002 (Q

Scientific paper

We discuss the role of the U(1) axial symmetry for the phase structure of QCD at finite temperature. We expect that, above a certain critical temperature, also the U(1) axial symmetry will be restored. We will try to see if this transition has (or has not) anything to do with the usual chiral transition: various possible scenarios are discussed. In particular, we analyse a scenario in which the U(1) axial symmetry is still broken above the chiral transitions. We will show that this scenario can be consistently reproduced using an effective Lagrangian model. A new order parameter is introduced for the U(1) axial symmetry.

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