Λ-parameter of lattice QCD with Symanzik improved gluon actions
نویسندگان
چکیده
منابع مشابه
Lattice energy-momentum tensor with Symanzik improved actions.
We deene the energy-momentum tensor on lattice for the 4 and for the nonlinear-model Symanzik tree-improved actions, using Ward identities or an explicit matching procedure. The resulting operators give the correct one loop scale anomaly, and in the case of the sigma model they can have applications in Monte Carlo simulations .
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In the last few years it has become clear that there are a variety of gluon actions that give accurate results on coarse lattices (a = 0.2 − 0.4 fm); see various contributions to Lattice 96. Such actions have been constructed within the Symanzik improvement program, eliminating O(a) errors using tadpole improvement 2 at treeand at one-loop level, as well as within the MCRG (or “perfect action”)...
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We calculate one-loop renormalization factors of bilinear quark operators for gluon action including six-link loops and O(a)-improved quark action in the limit of massless quark. We find that finite parts of one-loop coefficients of renormalization factors diminish monotonically as either of the coefficients c1 or c2 + c3 of the six-link terms are decreased below zero. Detailed numerical result...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2007
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.76.114514