arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2109.14969hep-ex
收藏

CKM元素$|V_{cs}|$和$D_s^+\toμ^+ν_μ$在STCF衰变的衰变常数PDMATHAAC的展望

Prospects of CKM elements $|V_{cs}|$ and decay constant $f_{D_{s}^+}$ in $D_s^+\toμ^+ν_μ$ decay at STCF

Jiajun Liu, Xiaodong Shi, Huijing Li, Xiaorong Zhou, Bo Zheng

摘要:

我们报道了利用STCF的快速模拟软件包对纯轻子衰变$D_s^+\toμ^+ν_μ$的可行性研究。在STCF收集的质量中心能量为4.009 GeV的$1~\mathrm{ab}^{-1}$的预期光度下,分支分数的统计灵敏度被确定为0.3%。结合这一结果与$c\rightarrow s$夸克混合矩阵元$|V_{cs}|$确定从目前的全球标准模型拟合,$D_s^+$衰变常数,$f_{D_s^+}$的统计灵敏度估计为0.2%。另外,结合目前用格点QCD计算的$f_{D_s^+}$的结果,确定了$|V_{cs}|$的统计灵敏度为0. 2%,这有助于进一步探索可能的新物理. STCF将达到前所未有的精度,这将提供QCD的精确校准和标准模型的严格检验。

英文摘要:

We report a feasibility study of pure leptonic decay $D_s^+\toμ^+ν_μ$ by using a fast simulation software package at STCF. With an expected luminosity of $1~\mathrm{ab}^{-1}$ collected at STCF at a center-of-mass energy of 4.009 GeV, the statistical sensitivity of the branching fraction is determined to be 0.3\%. Combining this result with the $c\rightarrow s$ quark mixing matrix element $|V_{cs}|$ determined from the current global Standard Model fit, the statistical sensitivity of $D_s^+$ decay constant, $f_{D_s^+}$, is estimated to be 0.2\%. Alternatively, combining the current results of $f_{D_s^+}$ calculated by lattice QCD, the statistical sensitivity of $|V_{cs}|$ is determined to be 0.2\%, which helps probe possible new physics beyond. The unprecedented precision to be achieved at STCF will provide a precise calibration of QCD and rigorous test of Standard Model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑