Matrix elements of (delta S=2) operators with Wilson fermions

Details Matrix elements of (delta S=2) operators with Wilson fermions Matrix elements of (delta S=2) operators with Wilson fermions

2001-10-02

arxiv.org/abs/hep-lat/0110006v3

Nucl.Phys.Proc.Suppl.106:326-328,2002

Physics

High Energy Physics

High Energy Physics - Lattice

Lattice2001 (matrix elements), 3 pages

Scientific paper

10.1016/S0920-5632(01)01703-0

We test the recent proposal of using the Ward identities to compute the K0-K0bar mixing amplitude with Wilson fermions, without the problem of spurious lattice subtractions. From our simulations, we observe no difference between the results obtained with and without subtractions. In addition, from the standard study of the complete set of (delta S=2) operators, we quote the following (preliminary) results (in the MS(NDR) scheme): Bk(2 GeV)=0.70(10), < O7^{3/2}>_{K->pi pi} = 0.10(2)(1) GeV^3, < O8^{3/2}>_{K->pi pi} = 0.49(6)(0) GeV^3.

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