Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-07-15
JHEP 0510 (2005) 018
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, no figures; one discussion is modified, another one is added; final version to appear in JHEP
Scientific paper
10.1088/1126-6708/2005/10/018
The world-line formalism is used for the evaluation of the mixed heavy-quark-gluon condensate in two models of QCD - the stochastic vacuum model and the dual superconductor one. Calculations are performed for an arbitrary dimensionality of space-time $d\ge 2$. While in the stochastic vacuum model, the condensate is UV finite up to $d=8$, in the dual superconductor model it is UV divergent at any $d\ge 2$. A regularization of this divergence is proposed, which makes quantitative the condition of the type-II dual superconductor. The obtained results are generalized to the case of finite temperatures. Corrections to the both, mixed and standard, heavy-quark condensates, which appear due to the variation of the gauge field at the scale of the vacuum correlation length, are evaluated within the stochastic vacuum model. These corrections diminish the absolute values of the condensates, as well as the ratio of the mixed condensate to the standard one.
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