Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2004-09-14
Physics
High Energy Physics
High Energy Physics - Lattice
Talk given at the XXII International Symposium on Lattice Field Theory (LATTICE 2004), Fermilab, Batavia, Illinois, USA, 21-26
Scientific paper
10.1016/j.nuclphysbps.2004.11.34
The thermal effects on the quark-gluon mixed condensate g<\bar{q} \sigma G q>, which is another chiral order parameter, are studied using the SU(3)c lattice QCD with the Kogut-Susskind fermion at the quenched level. We perform the accurate measurement of the mixed condensate as well as the quark condensate for 0MeV<=T<=500MeV. We observe the sharp decrease of both the condensates around T_c \simeq 280MeV, while the thermal effects below T_c are found to be weak. 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, which indicates that the two condensates have nontrivial similarity in the chiral behaviors. We also present the correlation between the condensates and the Polyakov loop to understand the vacuum structure of QCD.
Doi Takumi
Ishii Noriyoshi
Oka Makoto
Suganuma Hideo
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