Matrix Elements without Quark Masses on the Lattice
arXiv:hep-lat/9909041 · doi:10.1016/S0920-5632(00)91634-7
Abstract
We introduce a new parameterization of four-fermion matrix elements which does not involve quark masses and thus allows a reduction of systematic uncertainties in physical amplitudes. As a result the apparent quadratic dependence of e'/e on m_s is removed. To simplify the matching between lattice and continuum renormalization schemes, we express our results in terms of Renormalization Group Invariant B-parameters which are renormalization-scheme and scale independent. As an application of our proposal, matrix elements of DeltaI=3/2 and SUSY DeltaF=2 () four-fermion operators have been computed.
LATTICE99(Matrix Elements), 3 pages, 1 figure, BUHEP-99-21