Relation between bare lattice coupling and MSbar coupling at one loop with general lattice fermions

Details Relation between bare lattice coupling and MSbar coupling at one loop with general lattice fermions Relation between bare lattice coupling and MSbar coupling at one loop with general lattice fermions

2006-02-16

arxiv.org/abs/hep-lat/0602023v3

Phys.Rev.D78:014512,2008

Physics

High Energy Physics

High Energy Physics - Lattice

26 pages, 1 figure, to appear in Phys.Rev.D. Completely rewritten with new title and new material added (see abstract). Some m

Scientific paper

10.1103/PhysRevD.78.014512

A compact general integral formula is derived from which the fermionic contribution to the one-loop coefficient in the perturbative expansion of the MSbar coupling in powers of the bare lattice coupling can be extracted. It is seen to reproduce the known results for unimproved naive, staggered and Wilson fermions, and has advantageous features which facilitate the evaluation in the case of improved lattice fermion formulations. This is illustrated in the case of Wilson clover fermions, and an expression in terms of known lattice integrals is obtained in this case which gives the coefficient to much greater numerical accuracy than in the previous literature.

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