Abstract
We study the discovery potential of the non-Standard Model (SM) heavy Higgs bosons in the Two-Higgs-Doublet Models (2HDMs) at a multi-TeV muon collider and explore the discrimination power among different types of 2HDMs. We find that the pair production of the non-SM Higgs bosons via the universal gauge interactions is the dominant mechanism once above the kinematic threshold. Single Higgs boson production associated with a pair of heavy fermions could be important in the parameter region with enhanced Yukawa couplings. For both signal final states, ${\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ annihilation channels dominate over the vector boson fusion (VBF) processes, except at high center of mass energies where the VBF processes receive large logarithmic enhancement with the increase of energies. Single Higgs boson $s$-channel production in ${\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$-annihilation via the radiative return can also be important for the Type-L 2HDM in the very large $\mathrm{tan}\ensuremath{\beta}$ region, extending the kinematic reach of the heavy Higgs boson mass to the collider energy. Considering both the production and decay of non-SM Higgs bosons, signals can be identified over the Standard Model backgrounds. With the pair production channels via annihilation, 95% C.L. exclusion reaches in the Higgs mass up to the production mass threshold of $\sqrt{s}/2$ are possible when channels with different final states are combined. Including single production modes can extended the reach further. Different types of 2HDMs can be distinguishable for moderate and large values of $\mathrm{tan}\ensuremath{\beta}$.
Highlights
The discovery of the Standard Model Higgs boson completes the particle spectrum of the Standard Model (SM) of elementary particle physics
The production of heavy Higgs bosons in association with fermions is achieved through Yukawa couplings, the cross sections are sensitive to tan β, which behave differently for different types of 2HDMs
While the cross section at tan β 1⁄4 1 is much smaller than the other production channels we considered earlier, the cross section scales like tan2 β in type-II/L, which could be sizable at large tan β
Summary
The discovery of the Standard Model Higgs boson completes the particle spectrum of the Standard Model (SM) of elementary particle physics. Recent studies demonstrated the impressive physics potentials exploring the EW sector, including precision Higgs boson coupling measurements [19], the electroweak dark matter detection [20], and discovery of other BSM heavy particles [21]. We explore the discovery potential for the non-SM heavy Higgs bosons at a high-energy muon collider in the framework of 2HDMs [22]. We consider the colliders [10] in the braenngcehmoafrkpffisffien1⁄4er3g–ie3s0 for the muon TeV, with the integrated luminosity scaled as We study both the heavy Higgs boson pair production as well as single production associated with two heavy fermions.
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