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The quark-gluon mixed condensate g<\bar{q} \sigma G q> is studied usingSU(3)c lattice QCD with the Kogut-Susskind fermion at the quenched level. Usingthe lattices as \beta = 6.0 with 16^3 * N_t (N_t=16,12,10,8,6,4), \beta = 6.1with 20^3 * N_t (N_t=20,12,10,8,6) and \beta = 6.2 with 24^3 * N_t(N_t=24,16,12,10,8) in high statistics of 100-1000 gauge configurations, weperform accurate measurement of the thermal effects on g<\bar{q} \sigma G q> aswell as <\bar{q}q> in the chiral limit. We find that the thermal effects onboth the condensates are very weak except for the vicinity of T_c, while boththe condensates suddenly vanish around T_c \simeq 280 MeV, which indicatesstrong chiral restoration near 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 evenin the very vicinity of T_c, which means that these two different condensatesobey the same critical behavior. This nontrivial similarity between them wouldimpose constraints on the chiral structure of the QCD vacuum near T_c.Comment: Talk given at Color Confinement and Hadrons in Quantum Chromodynamics  (Confinement 2003), Saitama, Japan, 21-24 July 2003, 5 pages, 3 figure

cornell university

THE STUDY OF CHIRAL RESTORATION USING THE QUARK-GLUON MIXED CONDENSATE $ g\left\langle {\bar q\sigma _{\mu \upsilon } G_{\mu \upsilon } q} \right\rangle $ IN LATTICE QCD AT FINITE TEMPERATURE