Electroweak couplings of the Higgs boson at a multi-TeV muon collider
Electroweak couplings of the Higgs boson at a multi-TeV muon collider
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DOI：
10.1103/physrevd.103.013002
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发表时间：
2020-08
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通讯作者：
T. Han;Da Liu;I. Low;Xing Wang
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作者：
T. Han;Da Liu;I. Low;Xing Wang
我们估计了在多tev介子对撞机上测量希格斯玻色子与电弱规范玻色子的耦合$HVV$和$HHVV $ (V=W^\pm，Z)$以及三线性希格斯自耦合$HHH$的期望精度。在非常高的能量下，单和双希格斯产物都依赖于矢量-玻色子聚变（VBF）拓扑结构。出出的残余粒子有很强的停留在极前区的倾向，导致了“包容过程”的构型，使$ZZ$聚变事件难以从$ w $聚变事件中分离出来。在单希格斯通道中，我们使用两个类别对$HWW$和$HZZ$耦合进行了最大似然分析：包含希格斯产生和1 μ子独占信号。在双希格斯通道中，我们利用不变质谱中的运动学信息，考虑了包容产生，研究了三线性$HHH$和四次$VVHH$耦合的相互作用。我们发现，在质量中心能量为10 TeV (30 TeV)，综合光度为10 ab$^{-1}$ （90 ab$ $^{-1}$）的情况下，$WWH$耦合可以达到95%的置信水平灵敏度：$WWH$耦合为0.073\% (0.023\%),$ZZH$耦合为0.61\% (0.21\%),$WWHH$耦合为0.62\% (0.20\%),$HHH$耦合为5.6%（2.0\%）。对于参与这一过程的dim-6算子，这些灵敏度可以在10 TeV (30 TeV) μ介子对撞机上探测到1-10 (2-20)TeV量级的新物理尺度。
We estimate the expected precision at a multi-TeV muon collider for measuring the Higgs boson couplings with electroweak gauge bosons, $HVV$ and $HHVV\ (V=W^\pm,Z)$, as well as the trilinear Higgs self-coupling $HHH$. At very high energies both single and double Higgs productions rely on the vector-boson fusion (VBF) topology. The outgoing remnant particles have a strong tendency to stay in the very forward region, leading to the configuration of the "inclusive process" and making it difficult to isolate $ZZ$ fusion events from the $WW$ fusion. In the single Higgs channel, we perform a maximum likelihood analysis on $HWW$ and $HZZ$ couplings using two categories: the inclusive Higgs production and the 1-muon exclusive signal. In the double Higgs channel, we consider the inclusive production and study the interplay of the trilinear $HHH$ and the quartic $VVHH$ couplings, by utilizing kinematic information in the invariant mass spectrum. We find that at a centre-of-mass energy of 10 TeV (30 TeV) with an integrated luminosity of 10 ab$^{-1}$ (90 ab$^{-1}$), one may reach a 95\% confidence level sensitivity of 0.073\% (0.023\%) for $WWH$ coupling, 0.61\% (0.21\%) for $ZZH$ coupling, 0.62\% (0.20\%) for $WWHH$ coupling, and 5.6\% (2.0\%) for $HHH$ coupling. For dim-6 operators contributing to the processes, these sensitivities could probe the new physics scale $\Lambda$ in the order of $1-10$ ($2-20$) TeV at a 10 TeV (30 TeV) muon collider.