Mesonic correlation lengths in high-temperature QCD
Abstract
We consider spatial correlation lengths for various QCD light quark bilinears at temperatures above a few hundred MeV. Some of the correlation lengths (such as that related to baryon density) coincide with what has been measured earlier on from glueball-like states; others do not couple to glueballs, and have a well-known perturbative leading-order expression as well as a computable next-to-leading-order correction. We determine the latter following analogies with the NRQCD effective theory, used for the study of heavy quarkonia at zero temperature: we find (for the quenched case) -1 = 2 π T + 0.1408 g2 T, and compare with lattice results. One manifestation of UA(1) symmetry non-restoration is also pointed out.
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