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Matrix elements of Delta S = 2 operators with Wilson fermions

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	Becirevic, D.; Boucaud, Ph.; Giménez Gómez, Vicente; Lubicz, V.; Martinelli, Guido; Papinutto, Mauro
	This document is a artículoDate2002
	Este documento está disponible también en : http://hdl.handle.net/10550/38982
	We test the recent proposal of using the Ward identities to compute the K-0 - (K) over bar (0) mixing amplitude with Wilson fermions, without the problem of spurious lattice subtractions. From our simulations, we observe no difference between results obtained with and without subtractions. From the standard study of the complete set of DeltaS = 2 operators, we quote the following (preliminary) results: B-K((MS) over bar) (2 GeV) = 0.70(10), (O-tau)(K-->pipi)((I=2)) = 0.10(2)(1)GeV3, <O-8>((I=2))(K-->pipi) = 0.49(6)(0)GeV3.
	Becirevic, D. Boucaud, Ph. Giménez Gómez, Vicente Lubicz, V. Martinelli, G. Papinutto, Mauro 2002 Matrix elements of Delta S = 2 operators with Wilson fermions Nuclear Physics B-Proceedings Supplements 106 326 328
	http://dx.doi.org/10.1016/S0920-5632(01)01703-0