CERN Accelerating science

Article
Report number	arXiv:2112.08377 ; FERMILAB-PUB-21-737-T
Title	Systematically testing singlet models for (g − 2)$_{μ}$
Related title	Systematically Testing Singlet Models for $(g-2)_\mu$
Author(s)	Capdevilla, Rodolfo (Toronto U. ; Perimeter Inst. Theor. Phys.) ; Curtin, David (Toronto U.) ; Kahn, Yonatan (Illinois U., Urbana (main) ; Illinois U., Urbana) ; Krnjaic, Gordan (Fermilab ; Chicago U., Astron. Astrophys. Ctr. ; Chicago U., KICP)
Publication	2022
Imprint	2021-12-15
Number of pages	32
Note	28 pages, 11 figures. Added missing references in v2 and v3
In:	JHEP 2204 (2022) 129
DOI	10.1007/JHEP04(2022)129 (publication)
Subject category	hep-ph ; Particle Physics - Phenomenology
Study	IMCC
Abstract	We comprehensively study all viable new-physics scenarios that resolve the muon $(g-2)_\mu$ anomaly with only Standard Model singlet particles coupled to muons via renormalizable interactions. Since such models are only viable in the MeV -- TeV mass range and require sizable muon couplings, they predict abundant accelerator production through the same interaction that resolves the anomaly. We find that a combination of fixed-target (NA64$\mu$, $M^3$), $B$-factory (BABAR, Belle II), and collider (LHC, muon collider) searches can cover nearly all viable singlets scenarios, independently of their decay modes. In particular, future muon collider searches offer the only certain test of singlets above the GeV scale, covering all higher masses up to the TeV-scale unitarity limit for these models. Intriguingly, we find that $\mathcal{O}(100 \mathrm{GeV})$ muon colliders may yield better coverage for GeV-scale singlets compared to TeV-scale concepts, which has important implications for the starting center-of-mass energy of a staged muon collider program.
Copyright/License	preprint: (License: arXiv nonexclusive-distrib 1.0) publication: © 2022-2024 The Authors (License: CC-BY-4.0)

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