Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1993-12-29
Nucl.Phys. B435 (1995) 207-240
Physics
High Energy Physics
High Energy Physics - Phenomenology
37 pages, plain TeX (using `phyzzx' macro), (( 8 figures - available on request from sho1@yamabuki.comp.metro-u.ac.jp ))
Scientific paper
10.1016/0550-3213(94)00392-R
We study the color confinement, the $q$-$\bar q$ pair creation and the dynamical chiral-symmetry breaking of nonperturbative QCD by using the dual Ginzburg-Landau theory, where QCD-monopole condensation plays an essential role on the nonperturbative dynamics in the infrared region. As a result of the dual Meissner effect, the linear static quark potential, which characterizes the quark confinement, is obtained in the long distance within the quenched approximation. We obtain a simple expression for the string tension similar to the energy per unit length of a vortex in the superconductivity physics. The dynamical effect of light quarks on the quark confining potential is investigated in terms of the infrared screening effect due to the $q$-$\bar q$ pair creation or the cut of the hadronic string. The screening length of the potential is estimated by using the Schwinger formula for the $q$-$\bar q$ pair creation. We introduce the corresponding infrared cutoff to the strong long-range correlation factor in the gluon propagator as a dynamical effect of light quarks, and obtain a compact formula of the quark potential including the screening effect in the infrared region. We investigate the dynamical chiral-symmetry breaking by using the Schwinger-Dyson equation, where the gluon propagator includes the nonperturbative effect related to
Sasaki Shoichi
Suganuma Hideo
Toki Hiroshi
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