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Matrix elements of Delta S = 2 operators with Wilson fermions

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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

Aquest document és un/a article, creat/da en: 2002

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.

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