The muon Smasher’s guide

Abstract

We lay out a comprehensive physics case for a future high-energy muon collider, exploring a range of collision energies (from 1 to 100 TeV) and luminosities. We highlight the advantages of such a collider over proposed alternatives. We show how one can leverage both the point-like nature of the muons themselves as well as the cloud of electroweak radiation that surrounds the beam to blur the dichotomy between energy and precision in the search for new physics. The physics case is buttressed by a range of studies with applications to electroweak symmetry breaking, dark matter, and the naturalness of the weak scale. Furthermore, we make sharp connections with complementary experiments that are probing new physics effects using electric dipole moments, flavor violation, and gravitational waves. An extensive appendix provides cross section predictions as a function of the center-of-mass energy for many canonical simplified models.

High precision higgs from high energy muon colliders

“…that at high energy lepton colliders, vector boson fusion (VBF) production modes begin to dominate for many electroweak processes [25,26], allowing them to be thought of as gauge boson colliders [9,10,14,25]. However, since we focus on single Higgs precision in this paper for muon colliders, in figure 1 we show only the unpolarized cross sections for the most important production mechanisms as a function of energy, where we have separated W W and ZZ fusion for single Higgs production.…”

“…For a broad overview of the physics case see e.g. [14]. In this paper, we focus on further developing the sensitivity for single Higgs precision at high energy muon colliders.…”

“…In this paper, we focus on further developing the sensitivity for single Higgs precision at high energy muon colliders. Thus far, single Higgs precision studies for high energy muon colliders have been explored only at the signal-only level for most channels [14] and including backgrounds only for a few specific cases [15,16]. Here we extend the analysis of [14] to include the hard contributions to backgrounds for all relevant channels using a fast detector simulation.…”

“…Thus far, single Higgs precision studies for high energy muon colliders have been explored only at the signal-only level for most channels [14] and including backgrounds only for a few specific cases [15,16]. Here we extend the analysis of [14] to include the hard contributions to backgrounds for all relevant channels using a fast detector simulation. In particular we focus on two cases, a 10 TeV muon collider with an integrated luminosity of 10/ab and a 3 TeV muon collider with an integrated luminosity of 1/ab.…”

Muonphilic dark matter explanation of gamma-ray galactic center excess: a comprehensive analysis

“…Finally, the muonphilic DM models with Z 2 -even JHEP07(2022)127 mediators can easily escape the mono-photon and mono-jet constraints from LEP [25] and LHC [2,26] such that the electroweak scale DM is still allowed. Furthermore, the future muon colliders can be used to test these muonphilic DM models [27][28][29]. For the Z 2 -even MED, µ + µ − → µ + µ − process is powerful to directly search for the MED and the mono-γ process can be used to explore DM when a DM pair is produced form the on-shell MED.…”