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Relations Among Correlation Functions in the High Temperature Phase of QCD with Broken SU(3)

Michael C. Birse·Thomas D. Cohen·Judith A. McGovern
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Abstract

Group-theoretic arguments are used to determine the dependence of two-point correlators of quark bilinears on the current quark masses. The leading difference between $π$ and $δ$ correlators is found to be of order $m_s$ times a U(1)$_{\scriptscriptstyle A}$-violating correlator. These general arguments are consistent with Schaefer's observation that if U(1)$_{\scriptscriptstyle A}$ violation persists to high enough temperatures then the strange $η$ can be lighter than the non-strange one.

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Michael C. Birse, Thomas D. Cohen, Judith A. McGovern. 1997-01-29. Relations Among Correlation Functions in the High Temperature Phase of QCD with Broken SU(3). https://doi.org/10.1016/s0370-2693(97)00279-7

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