Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
1996-05-26
Nucl.Phys.B502:325-342,1997
Physics
High Energy Physics
High Energy Physics - Lattice
replaced version (with new title) with new data at larger lattices, checks for the symmetries of the lattice Green's functions
Scientific paper
10.1016/S0550-3213(97)00483-5
We compute the running QCD coupling on the lattice by evaluating two-point and three-point off-shell gluon Green's functions in a fixed gauge and imposing non-perturbative renormalisation conditions on them. Our exploratory study is performed in the quenched approximation at beta=6.0 on 16^4 and 24^4 lattices. We show that, for momenta in the range 1.8-2.3 Gev, our coupling runs according to the two-loop asymptotic formula, allowing a precise determination of the corresponding Lambda parameter. The role of lattice artifacts and finite-volume effects is carefully analysed and these appear to be under control in the momentum range of interest. Our renormalisation procedure corresponds to a momentum subtraction scheme in continuum field theory, and therefore lattice perturbation theory is not needed in order to match our results to the MSbar scheme, thus eliminating a major source of uncertainty in the determination of alpha_MSbar. Our method can be applied directly to the unquenched case.
Alles Bartomeu
Henty D. S.
Panagopoulos Haralambos
Parrinello Claudio
Pittori Carlotta
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