论文标题
$ b \ tosμμ$的新物理学：fcc-hh或amuon对撞机？
New Physics in $b \to s μμ$: FCC-hh or a Muon Collider?
论文作者
论文摘要
罕见的改变风味的中性电流过渡$ b \ tosμ^+μ^ - $探针比在LHC上直接访问的能量尺度更高。因此，正如当今的LHCB异常所建议的那样，在此类过渡中存在新物理学将对未来高能量乘客的动机和计划产生重大影响。当前争论的两个最突出的选项是100 TEV（FCC-HH）的Proton-Proton对撞机和多TEV MUON撞机（MUC）。在这项工作中，我们比较了这些基准上的这些围栏的发现前景新物理模型间接检测到可在$ b \中可检测到的sμ^+μ^ - $衰减，但超出了HL-LHC的高$ p_t $搜索的范围。我们考虑了一组全面的方案：半蛋白接触互动，$ z^\ prime $来自一个测量的$ u（1）_ {b_3 -l_μ} $和$ u（1）_ {l_μ -l_τ} $，标量leptoquark $ s_3 $ s_3 $ s_3 $，and vector leptoark $ u__1 $ 1 $。我们发现3 TEV MUC具有与FCC-HH之一相当的灵敏度。但是，对于足够重的介体，仅通过最高能量箱的偏差间接观察到3 TEV MUC的新物理效应，而FCC-HH具有更大的潜力来发现共振。最后，为了完全涵盖$bsμ$ $异常建议的参数空间，在拟议的未来山脉中，只有10个TEV（或更高）的MUC可以满足挑战。
Rare flavour-changing neutral-current transitions $b \to s μ^+ μ^-$ probe higher energy scales than what is directly accessible at the LHC. Therefore, the presence of new physics in such transitions, as suggested by the present-day LHCb anomalies, would have a major impact on the motivation and planning of future high-energy colliders. The two most prominent options currently debated are a proton-proton collider at 100 TeV (FCC-hh) and a multi-TeV muon collider (MuC). In this work, we compare the discovery prospects at these colliders on benchmark new physics models indirectly detectable in $b \to s μ^+ μ^-$ decays but beyond the reach of the high-$p_T$ searches at the HL-LHC. We consider a comprehensive set of scenarios: semileptonic contact interactions, $Z^\prime$ from a gauged $U(1)_{B_3 - L_μ}$ and $U(1)_{L_μ- L_τ}$, the scalar leptoquark $S_3$, and the vector leptoquark $U_1$. We find that a 3 TeV MuC has a sensitivity reach comparable to the one of the FCC-hh. However, for a heavy enough mediator, the new physics effects at a 3 TeV MuC are only observed indirectly via deviations in the highest energy bin, while the FCC-hh has a greater potential for the discovery of a resonance. Finally, to completely cover the parameter space suggested by the $bsμμ$ anomalies, among the proposed future colliders, only a MuC of 10 TeV (or higher) can meet the challenge.
