中文

来自格点 QCD 的 $B\to\pi\ell\ell$ 形状因子用于新物理搜寻

高能物理 - 唯象学 2015-10-14 v3 高能物理 - 格点

摘要

稀有衰变 Bπ+B\to\pi\ell^+\ell^- 源于 bdb\to d 味改变中性流,可能对标准模型之外的物理敏感。在此,我们首次给出了 BπB\to\pi 张量形状因子 fTf_T 的从头算 QCD 计算结果。结合我们伴随工作 [J. A. Bailey 等人, Phys. Rev. D 92, 014024 (2015)] 中的矢量与标量形状因子 f+f_+f0f_0,这些结果参数化了在任何标准模型扩展下 BπB\to\pi 半轻衰变的强子贡献。我们得到标准模型中的总分支比 BR(B+π+μ+μ)=20.4(2.1)×109{\text{BR}}(B^+\to\pi^+\mu^+\mu^-)=20.4(2.1)\times10^{-9},这是迄今为止最精确的理论确定,并与 LHCb 实验最近的测量结果 [R. Aaij 等人, JHEP 1212, 125 (2012)] 一致。附加说明:本文提交发表后,LHCb 公布了该过程微分衰变率的新测量结果 [T. Tekampe, DPF 2015 报告],我们现在将其与标准模型预言的形状和归一化进行比较。

关键词

引用

@article{arxiv.1507.01618,
  title  = {$B\to\pi\ell\ell$ form factors for new-physics searches from lattice QCD},
  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 E. D. Freeland and E. Gamiz and Steven Gottlieb and U. M. Heller and A. S. Kronfeld and J. Laiho and L. Levkova and Yuzhi Liu and E. Lunghi and P. B. Mackenzie and Y. Meurice and E. Neil 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:1507.01618},
  year   = {2015}
}

备注

V3: Corrected errors in results for Standard-Model differential and total decay rates in abstract, Fig. 3, Table IV, and outlook. Added new preliminary LHCb data to Fig. 3 and brief discussion after outlook. Replaced outdated correlation matrix in Table III with correct final version. Other minor wording changes and references added. 7 pages, 4 tables, 3 figures