来自HPQCD的B介子混合与衰变常数最新结果
高能物理 - 格点
2010-11-05 v1
摘要
我们回顾了利用MILC N_f=2+1格点、NRQCD b夸克和AsqTad轻夸克得到的B_d和B_s混合参数的最新结果。还给出了衰变常数f_B和f_{B_s}的最新数值。将我们的格点结果与质量差ΔM_d和ΔM_s的实验测定相结合,得到了CKM矩阵元素的重要比值|V_{td}|/|V_{ts}| = 0.214(1)(5),以及分支比Br(B_s -> mu^+ mu^-) = 3.19(19) × 10^{-9}的更新标准模型数值。还描述了基于其他作用量的f_{B_s}初步新结果。
引用
@article{arxiv.0910.4131,
title = {Recent results on B mixing and decay constants from HPQCD},
author = {J. Shigemitsu and C. T. H. Davies and E. Follana and E. Gamiz and E. Gregory and G. P. Lepage and H. Na and M. Wingate},
journal= {arXiv preprint arXiv:0910.4131},
year = {2010}
}
备注
7 pages, 5 figures, contribution to the 27th International Symposium on Lattice Field Theory, Beijing, July 2009