Kaon Weak Matrix Elements with Wilson Fermions

C.-J.D.Lin; C.T.Sachrajda; D.Becirevic; G.Martinelli; M.Papinutto; Ph.Boucaud; V.Gimenez; V.Lubicz

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arxiv hep-lat/0209136 v1 pith:SNCS264N submitted 2002-09-18 hep-lat

Kaon Weak Matrix Elements with Wilson Fermions

D.Becirevic , Ph.Boucaud , V.Gimenez , C.-J.D.Lin , V.Lubicz , G.Martinelli , M.Papinutto , C.T.Sachrajda This is my paper

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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: <pi pi|O_7(2 GeV)|K>_{I=2}=0.14(1)(1) GeV^3 and <pi pi|O_8(2GeV)|K>_{I=2}=0.69(6)(6) GeV^3.

Kaon Weak Matrix Elements with Wilson Fermions

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