Vacuum polarisation, β-function, and Λ-parameter with general lattice fermions
نویسنده
چکیده
We derive a universality result for the fermionic contribution to the one loop vacuum polarisation in Lattice QCD. This leads in turn to a universality result for the fermionic contribution to the leading term in the weak coupling expansion of the Lattice QCD β-function. A general formula for the fermionic contribution to the ratio of lattice and continuum Λ-parameters is also obtained.
منابع مشابه
ar X iv : h ep - l at / 0 31 20 32 v 1 1 8 D ec 2 00 3 Vacuum Polarisation and Hadronic Contribution to muon g − 2 from Lattice QCD
We compute the vacuum polarisation on the lattice in quenched QCD using nonperturbatively improved Wilson fermions. Above Q2 of about 2 GeV2 the results are very close to the predictions of perturbative QCD. Below this scale we see signs of non-perturbative effects which we can describe by the use of dispersion relations. We use our results to estimate the light quark contribution to the muon’s...
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