强子对撞机对$R_{K^{(\ast)}}$脂肪味$Z^\prime$的灵敏度
Hadron Collider Sensitivity to Fat Flavourful $Z^\prime$s for $R_{K^{(\ast)}}$
摘要：
我们进一步调查的情况下，在一个大规模的$Z^\prime$粒子形式的新物理解释了明显的测量轻子味非普适性的$B \rightarrow K^{(\ast)} l^+ l^-$衰变。强子对撞机直接生产这种$Z^\prime$的灵敏度以前已经研究了窄宽度限制的$μ^+ μ^-$最终状态。在这里，我们将分析扩展到相当大的衰减宽度，并提高了窄宽度情况下的灵敏度估计。我们估计的灵敏度高亮度14 TeV的大型强子对撞机（HL-LHC），高能量27 TeV的LHC（HE-LHC），以及潜在的100 TeV的未来圆形对撞机（FCC）。HL-LHC对与异常一致的窄$Z^\prime$共振具有灵敏度。在我们的一个简化模型中，FCC可以探测23 TeV的$Z^\prime$粒子，其宽度高达其质量的0.35，置信水平（CL）为95%。在另一个模型中，HL-LHC和HE-LHC覆盖参数空间的相当大的部分，但是整个微扰参数空间可以被FCC覆盖。
英文摘要：
We further investigate the case where new physics in the form of a massive $Z^\prime$ particle explains apparent measurements of lepton flavour non-universality in $B \rightarrow K^{(\ast)} l^+ l^-$ decays. Hadron collider sensitivities for direct production of such $Z^\prime$s have been previously studied in the narrow width limit for a $μ^+ μ^-$ final state. Here, we extend the analysis to sizeable decay widths and improve the sensitivity estimate for the narrow width case. We estimate the sensitivities of the high luminosity 14 TeV Large Hadron Collider (HL-LHC), a high energy 27 TeV LHC (HE-LHC), as well as a potential 100 TeV future circular collider (FCC). The HL-LHC has sensitivity to narrow $Z^\prime$ resonances consistent with the anomalies. In one of our simplified models the FCC could probe 23 TeV $Z^\prime$ particles with widths of up to 0.35 of their mass at 95\% confidence level (CL). In another model, the HL-LHC and HE-LHC cover sizeable portions of parameter space, but the whole of perturbative parameter space can be covered by the FCC.
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