Heavy Neutral Leptons at Muon Colliders

Abstract

The future high-energy muon colliders, featuring both high energy and low background, could play a critical role in our searches for new physics. The smallness of neutrino mass is a puzzle of particle physics. Broad classes of solutions to the neutrino puzzles can be best tested by seeking the partners of SM light neutrinos, dubbed as heavy neutral leptons (HNLs), at muon colliders. We can parametrize HNLs in terms of the mass $m_N$ and the mixing angle with $\ell$-flavor $U_{\ell }$. In this work, we focus on the regime $m_N>O(100)$ GeV and study the projected sensitivities on the $|U_{\ell }{|}^2-m_N$ plane with the full-reconstructable HNL decay into a hadronic $W$ and a charged lepton. The projected reach in $|U_{\ell }{|}^2$ leads to the best sensitivities in the TeV realm.

33 pages, 10 figures

References in corpus (23)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Leptogenesis
• Phenomenology with Massive Neutrinos
• Right-Handed Neutrinos at LHC and the Mechanism of Neutrino Mass Generation
• Heavy neutrino signals at large hadron colliders
• Vector boson fusion at multi-TeV muon colliders
• High Energy Leptonic Collisions and Electroweak Parton Distribution Functions
• Heavy Majorana Neutrinos from $W\gamma$ Fusion at Hadron Colliders
• Multilepton and Lepton Jet Probes of Sub-Weak-Scale Right-Handed Neutrinos
• Sterile neutrino searches via displaced vertices at LHCb
• Radiative Inverse Seesaw: Verifiable New Mechanism of Neutrino Mass
• The Effective Vector Boson Approximation in High-Energy Muon Collisions
• Searches for Long-Lived Particles at the Future FCC-ee
• Neutrino Up-scattering via the Dipole Portal at Forward LHC Detectors
• Minimal Dynamical Inverse See Saw
• Collider Searches for Heavy Neutral Leptons: beyond simplified scenarios
• Heavy neutrinos at future linear e${}^{+}$e${}^{-}$ colliders
• Composite Dirac Neutrinos
• Three-Body Decays of Heavy Dirac and Majorana Fermions
• HNL mass degeneracy: implications for low-scale seesaws, LNV at colliders and leptogenesis
• Neutrino Masses from Low Scale Partial Compositeness
• Light Sterile Neutrinos and a High-Quality Axion from a Holographic Peccei-Quinn Mechanism
• Leptonic CP Violation Phases, Quark-Lepton Similarity and Seesaw Mechanism

Cited by in corpus (13)

• Searches for Long-Lived Particles at the Future FCC-ee
• Phenomenology of the simplest linear seesaw mechanism
• Lepton flavor physics at ${\mu }^{+}{\mu }^{+}$ colliders
• Multi Higgs production via photon fusion at future multi-TeV muon colliders
• Testing electroweak scale seesaw models at $e^{-}\gamma$ and $\gamma \gamma$ colliders
• Measuring lepton number violation in heavy neutral lepton decays at the future muon collider
• EW corrections and Heavy Boson Radiation at a high-energy muon collider
• Distinguishing Dirac from Majorana Heavy Neutrino at Future Lepton Colliders
• Long-lived Sterile Neutrino Searches at Future Muon Colliders
• Dark matter as the source of neutrino mass: theory overview and experimental prospects
• Investigation of the scalar unparticle and anomalous couplings at muon colliders in final states with multiple photons in the Randall- Sundrum model
• Barr-Zee Diagrams at a High-Energy Muon Collider
• Standard and Non-Standard Aspects of Neutrino Physics