Effective Restoration of the U_A(1) symmetry in the SU(3) linear sigma model

Details Effective Restoration of the U_A(1) symmetry in the SU(3) linear sigma model Effective Restoration of the U_A(1) symmetry in the SU(3) linear sigma model

1999-06-14

arxiv.org/abs/hep-ph/9906361v3

Phys.Rev.Lett.84:3261,2000

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, RevTeX, 3 postscript figures, new figure with spectral function, references to NJL model added, discussion about scal

Scientific paper

10.1103/PhysRevLett.84.3261

The effective restoration of the chiral U(A)(1) symmetry in strong interactions is studied using the linear chiral SU(3)xSU(3) model at finite temperatures. We find that the disappearance of the chiral anomaly causes a considerable change in the meson mass spectrum. We propose several signals for detecting this chiral phase in ultrarelativistic heavy-ion collisions: The eta/pi0 ratio is enhanced by an order of magnitude, the a0 is suppressed in the K+K- mass spectrum, and the scalar kappa meson appears as a peak just below the K*(892) in the invariant piK mass spectrum.

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