期刊
PHYSICS LETTERS B
卷 587, 期 1-2, 页码 157-166出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2004.03.010
关键词
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We show that, if the formula for the topological charge density operator suggested by the use of fermions obeying the Ginsparg-Wilson relation is employed, it is possible to give a precise and unambiguous definition of the topological susceptibility in full QCD, X-tL(full), for finite quark masses on the lattice. The lattice expression of X-tL(full) looks like the formal continuum one, in the sense that no power divergent subtractions are needed for its proper definition. As a consequence, the small mass X-tL(full) leads directly to a multiplicative renormalizable definition of the chiral condensate that does not require any behaviour of X-tL(full) power divergent subtraction. (C) 2004 Published by Elsevier B.V.
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