On systematic errors due to quenching in epsilon-prime over epsilon

Details On systematic errors due to quenching in epsilon-prime over epsilon On systematic errors due to quenching in epsilon-prime over epsilon

2002-08-28

arxiv.org/abs/hep-lat/0208069v1

Physics

High Energy Physics

High Energy Physics - Lattice

contribution to Lattice2002(matrixel)

Scientific paper

10.1016/S0920-5632(03)01575-5

Recently, we pointed out that chiral transformation properties of penguin operators change in the transition from unquenched to (partially) quenched QCD. As a consequence, new operators appear in (partially) quenched QCD penguins, introducing ambiguities which should be considered a quenching artifact. Here we discuss more specifically the effects of this phenomenon on the quenched Delta I=1/2 K to pi pi amplitude, and in particular, its potential numerical effect on recent lattice estimates for epsilon-prime over epsilon.

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