Quark-Gluon Mixed Condensate (anti-Q sigma G Q) from Lattice QCD

Details Quark-Gluon Mixed Condensate (anti-Q sigma G Q) from Lattice QCD Quark-Gluon Mixed Condensate (anti-Q sigma G Q) from Lattice QCD

2002-12-03

arxiv.org/abs/hep-lat/0212006v1

Nucl.Phys. A721 (2003) 934-937

Physics

High Energy Physics

High Energy Physics - Lattice

4 pages, Talk given at XVI International Conference on Particles and Nuclei (PANIC02), Osaka, Japan, Sep.30 - Oct.4, 2002

Scientific paper

10.1016/S0375-9474(03)01246-6

We study 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 100 gauge configurations on the 16^4 lattice with \beta = 6.0, we measure the mixed condensate at 16 points in each gauge configuration for each current-quark mass of m_q=21, 36, 52 MeV. From the 1600 data for each m_q, we find the ratio between the mixed condensate and the quark condensate, m_0^2 = g<\bar{q} sigma G q> / <\bar{q}q> \simeq 2.5 GeV^2 at the lattice scale of 1/a \simeq 2 GeV in the chiral limit. The large value of the mixed condensate suggests its importance in the operator product expansions in QCD. We also show our preliminary results of the mixed condensate at finite temperature.

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