Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
1992-07-09
Nucl.Phys.B389:247-264,1993
Physics
High Energy Physics
High Energy Physics - Lattice
23 pages, 4 ps figures
Scientific paper
10.1016/0550-3213(93)90292-W
A finite-size scaling technique is applied to the SU(2) gauge theory (without matter fields) to compute a non-perturbatively defined running coupling alpha(q) for a range of momenta q given in units of the string tension K. We find that already at rather low q, the evolution of alpha(q) is well described by the 2-loop approximation to the Callan-Symanzik beta-function. At the highest momentum reached, q=20 sqrt(K), we obtain alpha_MSbar(q)=0.187 +/- 0.005 +/- 0.009 for the running coupling in the MSbar scheme of dimensional regularization.
Lüscher Martin
Sommer Rainer
Weisz Peter
Wolff Ulli
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