文章基本信息

标题：Kaon B-parameter with NF=2 Wilson fermions
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作者：F. Mescia ; V. Gimenez ; V. Lubicz 等
期刊名称：PoS - Proceedings of Science
印刷版ISSN：1824-8039
出版年度：2005
卷号：2005
出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We present a preliminary study of the neutral kaon mixing bag parameter BK using two flavors of dynamicalWilson fermions. We determine the matrix element of the relevant DS =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 sea quark mass. At our relatively heavy values of quark masses (MP=MV '0:600:75) 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 ˆBK =1:02(20).