Kaon Weak Matrix Elements with Wilson Fermions

Details Kaon Weak Matrix Elements with Wilson Fermions Kaon Weak Matrix Elements with Wilson Fermions

2002-09-18

arxiv.org/abs/hep-lat/0209136v1

Nucl.Phys.Proc.Suppl.119:359-361,2003

Physics

High Energy Physics

High Energy Physics - Lattice

3 pages (5 eps figures), Lattice2002(matrixel)

Scientific paper

10.1016/S0920-5632(03)01551-2

We present results of several numerical studies with Wilson fermions relevant for kaon physics. We compute the B_K parameter by using two different methods and extrapolate to the continuum limit. Our preliminary result is B_K(2 GeV)=0.66(7). Delta I=3/2 K->pi pi matrix elements are obtained by using the next-to-leading order expressions derived in chiral perturbation theory in which the low energy constants are determined by the lattice results computed at unphysical kinematics. From the simulation at beta=6.0 our (preliminary) results read: _{I=2}=0.14(1)(1) GeV^3 and _{I=2}=0.69(6)(6) GeV^3.

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