Remarks on the discretization of physical momenta in lattice QCD

Tantalo, Nazario

doi:10.1016/j.nuclphysbps.2004.11.204

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Pos(lat2005)3651

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2005

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“…As a preliminary result, we quote the value ofB K obtained from a constant fit to the points obtained with the method without subtraction, namelŷ B K 1 02´20µ (3.2) In order to reduce the uncertainties, we plan to include in the analysis more external momenta by exploiting the θ -boundary condition method of ref. [15].…”

Section: Pos(lat2005)365mentioning

confidence: 99%

Kaon B-parameter with NF=2 Wilson fermions

Mescia¹,

Gimenez²,

Martinelli³

et al. 2005

Proceedings of XXIIIrd International Symposium on Lattice Field Theory — PoS(LAT2005)

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We present a preliminary study of the neutral kaon mixing bag parameter B K using two flavors of dynamical Wilson fermions. We determine the matrix element of the relevant ∆S 2 operator by using both the conventional approach and the so called "non-subtraction method", and find that the latter leads to results with smaller uncertainties. After having implemented non-perturbative renormalization, we study the dependence of B K on the sea quark mass. At our relatively heavy values of quark masses (M P M V ³ 0 60 ¤0 75) such a dependence is found to be negligible and the results, within the statistical accuracy, are consistent with a quenched determination. As a preliminary result for the renormalization group invariant parameter we quoteB K 1 02´20µ.

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Section: Pos(lat2005)365mentioning

confidence: 99%