Probing Heavy Neutrino Magnetic Moments at the LHC using Long-Lived Particle Searches
Rebeca Beltr\'an, Patrick D. Bolton, Frank F. Deppisch, Chandan Hati,, and Martin Hirsch

TL;DR
This paper investigates the potential of LHC long-lived particle searches, specifically non-pointing photons, to detect sterile neutrino magnetic moments, offering sensitivity improvements over previous experiments and insights into new physics.
Contribution
It introduces a novel approach using LLP searches with non-pointing photons to probe sterile neutrino magnetic moments across a wide mass range, surpassing existing constraints.
Findings
LHC LLP searches can probe sterile-to-sterile dipole moments two orders of magnitude below LEP constraints.
Sensitivity to active-to-sterile dipole moments allows detection of neutrinos up to 700 GeV.
Synergy with charged lepton flavor violation searches can explore new physics at several TeV scales.
Abstract
We explore long-lived particle (LLP) searches using non-pointing photons at the LHC as a probe for sterile-to-sterile and active-to-sterile transition magnetic dipole moments of sterile neutrinos. We consider heavy sterile neutrinos with masses ranging from a few~GeV to several hundreds of GeV. We discuss transition magnetic dipole moments using the Standard Model effective field theory and low-energy effective field theory extended by sterile neutrinos (SMEFT and LEFT) and also provide a simplified UV-complete model example. LLP searches at the LHC using non-pointing photons will probe sterile-to-sterile dipole moments two orders of magnitude below the current best constraints from LEP, while an unprecedented sensitivity to sterile neutrino mass of about 700 GeV is expected for active-to-sterile dipole moments. For the UV model example with one-loop transition magnetic…
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Astrophysics and Cosmic Phenomena · Computational Physics and Python Applications
