Thermal effects on quark-gluon mixed condensate g<\bar{q} σG q> from lattice QCD

Details Thermal effects on quark-gluon mixed condensate g<\bar{q} σG q> from lattice QCD Thermal effects on quark-gluon mixed condensate g<\bar{q} σG q> from lattice QCD

2004-02-06

arxiv.org/abs/hep-lat/0402005v2

Phys.Rev. D70 (2004) 034510

Physics

High Energy Physics

High Energy Physics - Lattice

5 pages, 4 figures; one figure added, accepted to Phys.Rev.D

Scientific paper

10.1103/PhysRevD.70.034510

We present the first study of the thermal effects on the quark-gluon mixed condensate g<\bar{q} \sigma G q>, which is another chiral order parameter, in SU(3)c lattice QCD with the Kogut-Susskind fermion at the quenched level. Using the lattices at \beta=6.0, 6.1, 6.2 in high statistics, we calculate the mixed condensate as well as the quark condensate in the chiral limit for the temperature 0MeV <= T <= 500MeV. Except for the sharp decrease of both the condensates around T_c \simeq 280MeV, the thermal effects are found to be weak below T_c. We also find that the ratio m_0^2 = g<\bar{q} \sigma G q>/ <\bar{q}q> is almost independent of the temperature even in the very vicinity of T_c. This result indicates nontrivial similarity in the chiral behaviors of the two different condensates.

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