B_s→D_s/B→D半轻形状因子比率及其在BR(B^0_s→μ^+μ^-)中的应用
高能物理 - 格点
2012-07-26 v2 高能物理 - 实验
摘要
我们利用格点QCD计算了半轻衰变\bar{B}→D^+ℓ^-\bar{ν}和\bar{B}_s→D_s^+ℓ^-\bar{ν}之间的形状因子比率。这些比率是确定中性B介子衰变碎裂分数的新策略中的关键理论输入，而碎裂分数是测量BR(B^0_s→μ^+μ^-)所必需的。我们使用了MILC规范场组态系综，包含2+1种海夸克味道，在两个格点间距约0.12 fm和0.09 fm下进行。我们采用模型无关的z参数化将小反冲下的模拟结果外推至最大反冲。形状因子比率的结果为和。与QCD求和规则计算相反，未观察到与U-spin(d↔s)对称性的显著偏离。
引用
@article{arxiv.1202.6346,
title = {B_s->D_s/B->D Semileptonic Form-Factor Ratios and Their Application to BR(B^0_s->\mu^+\mu^-)},
author = {Jon A. Bailey and A. Bazavov and C. Bernard and C. M. Bouchard and C. DeTar and Daping Du and A. X. El-Khadra and J. Foley and E. D. Freeland and E. Gamiz and Steven Gottlieb and U. M. Heller and Jongjeong Kim and A. S. Kronfeld and J. Laiho and L. Levkova and P. B. Mackenzie and Y. Meurice and E. Neil and M. B. Oktay and Si-Wei Qiu and J. N. Simone and R. Sugar and D. Toussaint and R. S. Van de Water and Ran Zhou},
journal= {arXiv preprint arXiv:1202.6346},
year = {2012}
}
备注
30 pages, 11 figures. Fig. 1 updated. Table II added. Conforms with version published in Physical Review D, except typos fixed, as in the PRD Erratum, in Table V (previously Table IV in arXiv v1). Results unchanged