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Remarks on the U (1Þ) axial symmetry and the chiral transition in QCD at finite temperature

Abstract : We discuss the role of the U(1) axial symmetry for the scalar and pseudoscalar meson mass spectrum of QCD at finite temperature, above the chiral transition at T_c, using a chiral effective Lagrangian model, which, in addition to the usual chiral condensate, also includes a (possible) genuine U(1)_A-breaking condensate that (possibly) survives across the chiral transition. The motivations for considering this Lagrangian (and a critical comparison with other effective Lagrangian models existing in the literature) are presented. A detailed comparison between the case N_f=3 (or N_f>3) and the (remarkably different) case N_f=2 is performed. The results obtained in the case N_f=2 are also critically compared with the available lattice results.
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http://hal.in2p3.fr/in2p3-00958129
Contributor : Danielle Cristofol <>
Submitted on : Wednesday, March 12, 2014 - 9:02:01 AM
Last modification on : Tuesday, March 30, 2021 - 3:17:24 AM

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E. Meggiolaro, A. Morda. Remarks on the U (1Þ) axial symmetry and the chiral transition in QCD at finite temperature. Physical Review D, American Physical Society, 2013, 88, pp.096010. ⟨10.1103/PhysRevD.88.096010⟩. ⟨in2p3-00958129⟩

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