Regular Article - Theoretical Physics
Do instantons like a colorful background?
Institut fuer Theoretische Physik, Philosophenweg 16, 69120, Heidelberg, Germany
2 Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607, Hamburg, Germany
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Published online: 19 January 2007
We investigate chiral symmetry breaking and color symmetry breaking in QCD. The effective potential of the corresponding scalar condensates is discussed in the presence of non-perturbative contributions from the semiclassical one-instanton sector. We concentrate on a color singlet scalar background which can describe chiral condensation, as well as a color octet scalar background which can generate mass for the gluons. Whereas a non-vanishing singlet chiral field is favored by the instantons, we have found no indication for a preference of color octet backgrounds.
© Springer-Verlag Berlin Heidelberg, 2007