Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2005-10-06
PoS LAT2005 (2005) 284
Physics
High Energy Physics
High Energy Physics - Lattice
6 pages, 4 figures, contribution to Lattice2005(Theoretical developments)
Scientific paper
On the lattice searching for the gluon condensate is difficult because a large perturbative contribution to the expectation value of the action has to be subtracted before looking for a small contribution from a possible gluon condensate. The perturbative calculation therefore has to be very precise. We use a modified version of stochastic perturbation theory to calculate a perturbative series in a boosted coupling, which converges more rapidly than the series with the usual lattice coupling, reducing the uncertainties in our results. We do not see any condensate of dimension two, as suggested by some earlier lattice studies, but we do find a contribution from a dimension four condensate. The value of this condensate is approximately 0.04(1) GeV^4, but with large uncertainties.
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