Towards a Muon Collider

Abstract

A muon collider would enable the big jump ahead in energy reach that is needed for a fruitful exploration of fundamental interactions. The challenges of producing muon collisions at high luminosity and 10 TeV centre of mass energy are being investigated by the recently-formed International Muon Collider Collaboration. This Review summarises the status and the recent advances on muon colliders design, physics and detector studies. The aim is to provide a global perspective of the field and to outline directions for future work.

Single Higgs boson production at electron-positron colliders in gauge-Higgs unification

“…A − 0.10 13.00 3.865×10 11 1.599×10 15 The name of the parameter set and the corresponding z L , k, and sin 2 θ 0 W for each θ H and m KK are listed. In the SM, sin 2 θ W (MS) = 0.23122 ± 0.00004 at Z pole [12].…”

“…However, it is not yet clear whether the observed Higgs boson has exactly the same properties as those in the SM. The Higgs couplings to quarks, leptons, and SM gauge bosons, as well as the Higgs self-coupling, need to be determined more accurately in future collider experiments such as the International Linear Collider (ILC) [1][2][3][4][5][6], the Compact Linear Collider (CLIC) [7], the Future Circular Collider (FCC-ee) [8], the Cool Copper Collider (C 3 ) [9], Circular Electron Positron Collider (CEPC) [10], and muon collider [11].…”

“…The GHU models are classified into two types, depending on whether quarks and leptons belong to the vector or the spinor representation of SO (5) W . The GHU model whose quarks and leptons belong to the spinor representation of SO (5) W can be regarded as a low-energy effective description of the SO (11) GHU model [23][24][25][26][27][28][29], where the SM gauge symmetry SU (3) C × SU (2) L × U (1) Y is embedded in the SO (11) grand unified gauge symmetry [30][31][32][33][34][35] in higher dimensional framework [36][37][38][39][40][41][42][43][44][45][46][47][48][49][50]. The phenomena of the GHU model below the electroweak (EW) scale are very close to those of the SM in a parameter regime that satisfies the current experimental constraints on the Kaluza-Klein (KK) mass m KK ≳ 13 TeV and the AB phase θ H ≲ 0.1 [22,[51][52][53][54][55][56][57][58].…”

Study of the gluonic quartic gauge couplings at muon colliders

“…At leading order of ŝ, the relevant helicity amplitudes are As such, for the subprocess W + W − → gg, ŝ s  , we consider the largest possible ŝ;the unitarity bounds on the coefficients at different energies are listed in table 1. The energies are chosen as the muon colliders [52,53].…”

“…At present, the energy frontier attainable by muon colliders remains undetermined. Ongoing investigations are centered on a 10 TeV configuration, with a targeted integrated luminosity of 10 ab −1 [52,53]. With the high energy and high luminosity, the muon collider not only possesses a stronger capability for probing NP compared to the LHC but also has the ability for more precise measures.…”