Nonperturbative evaluation of a field correlator appearing in the heavy quarkonium system
M. Baker, J. S. Ball, N. Brambilla, A. Vairo
Abstract
Recently an electric and magnetic field correlator appearing in the description of the heavy quarkonium system was evaluated on the lattice. Here, we give a nonperturbative analytical evaluation of this field correlator using a dual description of long distance Yang--Mills theory and using the stochastic vacuum model. The two predictions are both compatible with lattice data but show a different dependence on the quark separation. We discuss the analytic results in relation to the lattice data.
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