New Laboratory Constraints on Neutrinophilic Mediators

Abstract

Neutrinophilic mediators are well-motivated messenger particles that can probe some of the least known sectors of fundamental physics involving nonstandard interactions of neutrinos with themselves and potentially with dark matter. In particular, light mediators coupling to the active neutrinos will induce new decay modes of the Standard Model mesons (e.g., ${\pi }^{\pm },K^{\pm }\to {\ell }^{\pm }+\nu +\varphi$), charged leptons (e.g., ${\tau }^{\pm }\to {\pi }^{\pm }+\nu +\varphi$), and gauge bosons (e.g., $Z\to \nu +\bar{\nu }+\varphi$). A common lore is that these decays suffer from infrared divergences in the limit of the vanishing mediator mass, i.e., $m_{\varphi }\to 0$. Here, we show that including the 1-loop contributions of these mediators to the standard 2-body decays (e.g., ${\pi }^{\pm },K^{\pm }\to {\ell }^{\pm }+\nu$, etc.), the infrared divergence from the 3-body decay cancels out exactly by virtue of the Kinoshita-Lee-Nauenberg theorem. Including these cancellation effects, we then update the existing laboratory constraints on neutrinophilic scalar mediators, thereby extending the limits far beyond the decaying parent particle mass and excluding a wider range of parameter space. These new ``physical'' limits derived here have significant implications for the future detection prospects of nonstandard neutrino (self-)interactions.

12 pages, 4 figures, 1 table, some updates on the limits, other minor changes, version published in PLB

References in corpus (58)

• Verifiable Radiative Seesaw Mechanism of Neutrino Mass and Dark Matter
• Observation of Coherent Elastic Neutrino-Nucleus Scattering
• Scalar Dark Matter candidates
• Pathways to Naturally Small Neutrino Masses
• Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm
• The Borexino detector at the Laboratori Nazionali del Gran Sasso
• Measurement of the Electron Magnetic Moment
• Flavor probes of axion-like particles
• Constraining the Self-Interacting Neutrino Interpretation of the Hubble Tension
• A CMB Search for the Neutrino Mass Mechanism and its Relation to the $H_0$ Tension
• Cosmic neutrino cascades from secret neutrino interactions
• Limits on Neutrino-Neutrino Scattering in the Early Universe
• Updated constraints on non-standard neutrino interactions from Planck
• Dirac neutrino mass generation from dark matter
• Neutrino Non-Standard Interactions: A Status Report
• Probing BSM Neutrino Physics with Flavor and Spectral Distortions: Prospects for Future High-Energy Neutrino Telescopes
• Neutrino Portals to Dark Matter
• Are small neutrino masses unveiling the missing mass problem of the Universe?
• Observational Constraints on Secret Neutrino Interactions from Big Bang Nucleosynthesis
• Dark matter-neutrino interactions through the lens of their cosmological implications
• Lepton-Number-Charged Scalars and Neutrino Beamstrahlung
• Revising Limits on Neutrino-Majoron Couplings
• Constraints on New Neutrino Interactions via Light Abelian Vector Bosons
• Probing Muonic Forces and Dark Matter at Kaon Factories
• Inflation meets neutrinos
• Majoron Dark Matter and Constraints on the Majoron-Neutrino Coupling
• Radiative Seesaw Mechanism at Weak Scale
• Revisiting Neutrino Self-Interaction Constraints from $Z$ and $\tau$ decays
• Bounds on Neutrino-Scalar Yukawa Coupling
• Strong Supernova 1987A Constraints on Bosons Decaying to Neutrinos
• New Physics and the Proton Radius Problem
• Search for $K^{+}$ decays to a muon and invisible particles
• Mono-Neutrino at DUNE: New Signals From Neutrinophilic Thermal Dark Matter
• Neutrino Self-Interactions and Double Beta Decay
• Probing Secret Interactions of Astrophysical Neutrinos in the High-Statistics Era
• Constraint on parity-violating muonic forces
• Bounds on secret neutrino interactions from high-energy astrophysical neutrinos
• Self-interacting neutrinos: solution to Hubble tension versus experimental constraints
• Recipes and Ingredients for Neutrino Mass at Loop Level
• Core-collapse supernovae stymie secret neutrino interactions
• AMEND: A Model Explaining Neutrino masses and Dark matter testable at the LHC and MEG
• Multimessenger Astronomy and New Neutrino Physics
• Large Neutrino Secret Interactions, Small Impact on Supernovae
• Towards Powerful Probes of Neutrino Self-Interactions in Supernovae
• Observation of the $\gamma \gamma \to \tau \tau$ process in Pb+Pb collisions and constraints on the $\tau$-lepton anomalous magnetic moment with the ATLAS detector
• Constraining secret gauge interactions of neutrinos by meson decays
• Supernova Emission of Secretly Interacting Neutrino Fluid: Theoretical Foundations
• Constraining axion-like particles from rare pion decays
• Solar Neutrino Scattering with Electron into Massive Sterile Neutrino
• Search for three body pion decays ${\pi }^{+}\to l^{+}\nu X$
• Light mass window of lepton portal dark matter
• Dark neutrino interactions make gravitational waves blue
• Leptonic Scalars and Collider Signatures in a UV-complete Model
• Light lepton portal dark matter meets the LHC
• Phenomenology of fermion dark matter as neutrino mass mediator with gauged B-L
• Solar Active-Sterile Neutrino Conversion with Atomic Effects at Dark Matter Direct Detection Experiments
• Light Neutrinophilic Dark Matter from a Scotogenic Model
• Dress code for infrared safe scattering in QED

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• The Dark Matter Diffused Supernova Neutrino Background
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• Monophotons from Scalar Portal Dark Matter at Neutrino Experiments
• Cosmic Overture Echoed in a Stellar Final Act: Implications of Nanohertz Gravitational Waves for Core Collapse Supernova Neutrinos
• Loop-Level Lepton Flavor Violation and Diphoton Signals in the Minimal Left-Right Symmetric Model
• Large Neutrino-Dark Matter Interactions: From Effective Field Theory to Ultraviolet Completions