出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We present recent progress in our calculation of BK with improved staggered fermions using chiral extrapolations based on SU(3) staggered chiral perturbation theory. We have accumulated significantly higher statistics on the coarse, fine, and ultrafine MILC asqtad lattices. This leads to a reduction in statistical error and an improved continuum extrapolation. Our updated result is ˆBK = BK(RGI) = 0:7370:003(stat)0:046(sys). This is consistent with the result obtained using chiral extrapolations based on SU(2) staggered chiral perturbation theory, although the total error is somewhat larger with the SU(3) analysis.
