We present a preliminary study of the neutral kaon mixing bag parameter BK using two flavors of dynamical Wilson fermions. We determine the matrix element of the relevant DeltaS=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 BK on the see quark mass. At our relatively heavy values of quark masses (0.60<M_P/M_V<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 quote BKRGI=1.02(25).
Mescia, F., Gimenez, V., Lubicz, V., Martinelli, G., Simula, S., Tarantino, C. (2006). Kaon B-parameter with Nf=2 dynamical Wilson fermions. In Lattice 2005: Proceedings of the 23rd International Symposium on Lattice Field Theory (pp.365).
Kaon B-parameter with Nf=2 dynamical Wilson fermions
LUBICZ, Vittorio;TARANTINO, CECILIA
2006-01-01
Abstract
We present a preliminary study of the neutral kaon mixing bag parameter BK using two flavors of dynamical Wilson fermions. We determine the matrix element of the relevant DeltaS=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 BK on the see quark mass. At our relatively heavy values of quark masses (0.60I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
