Long-Lived HNLs via ALP Portal at the LHC

Abstract

Heavy neutral leptons (HNLs) and axion-like particles (ALPs) are both considered well-motivated candidates for beyond the standard model (BSM) physics. If ALPs with sizable couplings to gluons exist, they will be abundantly produced at the LHC. Therefore, HNLs produced via the ALP portal may provide unprecedented sensitivities to HNL parameters. Here, we study the prospects for the high-luminosity LHC to search for long-lived HNLs. We consider future far detectors as well as ATLAS in our simulations. In the limit where the ALP mass is above the TeV scale, HNLs are effectively produced by a dimension-8 operator connecting HNL pairs to gluons. For completeness, we therefore also calculate future LHC sensitivities for HNLs produced via $N_R$SMEFT operators with gluons.

arXiv commentMatches published version in JHEP

References in corpus (51)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• FeynRules 2.0 - A complete toolbox for tree-level phenomenology
• MadGraph 5 : Going Beyond
• UFO - The Universal FeynRules Output
• Oscillating neutrinos and mu --> e, gamma
• The Low-Energy Frontier of Particle Physics
• A facility to Search for Hidden Particles at the CERN SPS: the SHiP physics case
• Physics of leptoquarks in precision experiments and at particle colliders
• Planck-Scale Physics and the Peccei-Quinn Mechanism
• Solutions to the strong CP problem in a world with gravity
• Collider Probes of Axion-Like Particles
• Long-Lived Particles at the Energy Frontier: The MATHUSLA Physics Case
• ALPs Effective Field Theory and Collider Signatures
• Dynamical Left-Right Symmetry Breaking
• Searching for long-lived particles beyond the Standard Model at the Large Hadron Collider
• Searching for Long-lived Particles: A Compact Detector for Exotics at LHCb
• New Detectors to Explore the Lifetime Frontier
• Left-Right Symmetry Breaking in NJL Approach
• Phenomenology of GeV-scale Heavy Neutral Leptons
• Flavor probes of axion-like particles
• Heavy Majorana Neutrinos in the Effective Lagrangian Description: Application to Hadron Colliders
• Neutrinoless double beta decay versus other probes of heavy sterile neutrinos
• The Present and Future Status of Heavy Neutral Leptons
• Operators up to Dimension Seven in Standard Model Effective Field Theory Extended with Sterile Neutrinos
• How Magnetic is the Dirac Neutrino?
• Factoring the Strong CP Problem
• Right-handed neutrino magnetic moments
• Collider Searches for Long-Lived Particles Beyond the Standard Model
• Color Unifed Dynamical Axion
• Heavy neutral fermions at the high-luminosity LHC
• Neutrino Lines from Majoron Dark Matter
• Planck Scale Effects on the Majoron
• Heavy Neutrinos in displaced vertex searches at the LHC and HL-LHC
• Planck Scale Symmetry Breaking and Majoron Physics
• Displaced vertices as probes of sterile neutrino mixing at the LHC
• Searches for light sterile neutrinos with multitrack displaced vertices
• Heavy neutral leptons at ANUBIS
• Displaced heavy neutrinos from $Z^{\prime }$ decays at the LHC
• Effective portals to heavy neutral leptons
• Pseudo-Majoron as Dark Matter
• Seeking for sterile neutrinos with displaced leptons at the LHC
• Long-lived heavy neutral leptons at the LHC: four-fermion single-$N_R$ operators
• Probing HNL-ALP couplings at colliders
• Quark flavor violation and axion-like particles from top-quark decays at the LHC
• Displaced Neutrino Jets at the LHeC
• Enhanced neutrino polarizability
• Probing Heavy Neutrino Magnetic Moments at the LHC using Long-Lived Particle Searches
• Searching for heavy neutral leptons coupled to axion-like particles at the LHC far detectors and SHiP
• Physics Briefing Book: Input for the 2026 update of the European Strategy for Particle Physics
• ALPs and HNLs at LHC and Muon Colliders: Uncovering New Couplings and Signals
• Axion framework with color-mediated Dirac neutrino masses