2003/09/18 by Takumi Doi, Noriyoshi Ishii, Makoto Oka +1
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-lat #hep-ph #nucl-th
paper · pdf · doi:10.1016/s0920-5632(03)02643-4
Talk given at the XXI International Symposium on Lattice Field Theory (LATTICE 2003), Tsukuba, Ibaraki, Japan, 15-19 July 2003, Lattice2003(nonzero), 3 pages, 2 figures
arxiv created 2003/09/18 · openalex publication_date 2004/03/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We study the quark-gluon mixed condensate g<q σG q> using the SU(3)c lattice QCD with the Kogut-Susskind fermion at the quenched level. We perform the first but accurate measurement of the thermal effects on the mixed condensate in lattice QCD at β= 6.0 with 163 * Nt (Nt=16,12,10,8,6,4), β= 6.1 with 203 * Nt (Nt=20,12,10,8,6), and β= 6.2 with 243 * Nt (Nt=24,16,12,10,8). At each temperature, the lattice calculation is carried out with high statistics using more than 100 gauge configurations. In particular, about 1000 gauge configurations are used near the critical temperature Tc. The chiral extrapolation is done from the lattice result with the current-quark mass of mq = 21,36,52 MeV. While the thermal effects on both of the mixed condensate and the quark condensate are very weak except for the vicinity of Tc, both the condensates suddenly vanish around Tc ≃ 280 MeV, which indicates strong chiral restoration near Tc. To compare the thermal effects on the two condensates, we analyze the ratio m02 = g<q σG q>/ <qq>, and find that m02 is almost independent of the temperature, even in the very vicinity of Tc. This means that these two different condensates obey the same critical behavior, and this nontrivial similarity between them would impose constraints on the chiral structure of the QCD vacuum near Tc.