Evidence for pronounced quark loop effects in QCD

Details Evidence for pronounced quark loop effects in QCD Evidence for pronounced quark loop effects in QCD

1997-05-21

arxiv.org/abs/hep-lat/9705031v1

Nucl.Phys.Proc.Suppl. 60A (1998) 306-310

Physics

High Energy Physics

High Energy Physics - Lattice

5 pages, 4 figures. Presented at Lattice QCD on Parallel Computers, Tsukuba, Japan, march 1997

Scientific paper

10.1016/S0920-5632(97)00492-1

We have measured the hadron spectrum in lattice QCD, using staggered fermions, for 0 (the quenched approximation), 2 and 4 light degenerate dynamical quarks. In addition to earlier results involving extrapolations in valence quark masses for fixed dynamical mass, we also report results where we extrapolate in the dynamical mass for 4 flavors. We see a marked difference in the hadron spectrum for 2 and 4 flavors; the hadron spectrum is nearly parity doubled for 4 flavors, indicating smaller effects of chiral symmetry breaking. This pronounced effect in the hadron spectrum cannot be removed by a simple change in scale as the number of light quark flavors is changed. Further simulations at larger volume are needed to rule out finite volume effects.

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