Constraints on Heavy Neutral Leptons interacting with a singlet scalar

Abstract

Heavy neutral leptons (HNLs) are an attractive minimal extension of the Standard Model, as is a singlet scalar $s$ mixing with the Higgs boson. If both are present, it is natural for HNLs to interact with $s$. For a light singlet,the decay $N\to s\nu$ can dominate over weak HNL decays. We reinterpret existing constraints on HNL mixing from the DELPHI, CHARM and Belle experiments for 0.5-100 GeV mass HNLs, taking into account the new decay channel. Although the constraints are typically weakened, in some cases they can become stronger, due to observable $s\to {\ell }^{+}{\ell }^{-}$ decays in the detectors. The method presented here could be used to recast constraints from other (older) experiments without resorting to computationally expensive Monte Carlo simulations. In addition, we update and correct some errors in the analysis of the original constraints, in the absence of the singlet.

arXiv comment14 pages, 11 figures. v2 matches published version

References in corpus (57)

• The $\nu$MSM, Dark Matter and Baryon Asymmetry of the Universe
• The $\nu$MSM, Dark Matter and Neutrino Masses
• FLAG Review 2019
• The role of sterile neutrinos in cosmology and astrophysics
• Strong Electroweak Phase Transitions in the Standard Model with a Singlet
• Study of the decay K+ => pi+,nu,nubar in the momentum region 140<Ppi<199 MeV/c
• How to find neutral leptons of the nuMSM?
• Electroweak baryogenesis and dark matter from a singlet Higgs
• Phenomenology of GeV-scale Heavy Neutral Leptons
• Decay and Detection of a Light Scalar Boson Mixing with the Higgs
• Electroweak baryogenesis and gravitational waves from a real scalar singlet
• Search for heavy neutral leptons in events with three charged leptons in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• A second Higgs from the Higgs portal
• Heavy sterile neutrinos: Bounds from big-bang nucleosynthesis and SN 1987A
• Search for Heavy Neutral and Charged Leptons in e+ e- Annihilation at LEP
• Search for Neutral Heavy Leptons in a High-Energy Neutrino Beam
• Probing the Electroweak Phase Transition with Higgs Factories and Gravitational Waves
• Search for heavy neutral leptons in decays of $W$ bosons produced in 13 TeV $pp$ collisions using prompt and displaced signatures with the ATLAS detector
• Search for the Decay $K_L\to {\pi }^0{\mu }^{+}{\mu }^{-}$
• Search for heavy neutrinos at Belle
• Real Higgs singlet and the electroweak phase transition in the standard model, (UM-P-93/80, OZ-93/20)
• BBN for the LHC: constraints on lifetimes of the Higgs portal scalars
• Improved BBN constraints on Heavy Neutral Leptons
• Improved bounds on the heavy neutrino productions at the LHC
• Gravitational waves and Higgs boson couplings for exploring first order phase transition in the model with a singlet scalar field
• Probing Majorana neutrinos in rare K and D, D_s, B, B_c meson decays
• Search for Heavy Isosinglet Neutrino in e+e- Annihilation at LEP
• Production of Heavy neutrino in next-to-leading order QCD at the LHC and beyond
• Baryogenesis and gravity waves from a UV-completed electroweak phase transition
• An Extended Analysis of Heavy Neutral Leptons during Big Bang Nucleosynthesis
• Search for a light pseudoscalar Higgs boson in the dimuon decay channel in pp collisions at sqrt(s) = 7 TeV
• NA62 sensitivity to heavy neutral leptons in the low scale seesaw model
• Long-lived Sterile Neutrinos at the LHC in Effective Field Theory
• Probing the Majorana neutrinos and their CP violation in decays of charged scalar mesons $\pi ,K,D,D_s,B,B_c$
• Heavy to light Higgs boson decays at NLO in the Singlet Extension of the Standard Model
• Sensitivity of Lepton Number Violating Meson Decays in Different Experiments
• Search for hadronic decays of a light Higgs boson in the radiative decay Upsilon --> gamma A0
• Constraints from the CHARM experiment on Heavy Neutral Leptons with tau mixing
• Search for Long-Lived Particles in $e^{+}{e}^{-}$ Collisions
• Search for heavy neutral leptons decaying into muon-pion pairs in the MicroBooNE detector
• Gravitational waves from a very strong electroweak phase transition
• Probing heavy neutrino oscillations in rare W boson decays
• CP violation in lepton number violating semihadronic decays of $K,D,D_s,B,B_c$
• Searching for Physics Beyond the Standard Model in an Off-Axis DUNE Near Detector
• Search for a Low-Mass Scalar Higgs Boson Decaying to a Tau Pair in Single-Photon Decays of Upsilon(1S)
• Heavy neutral leptons below the kaon mass at hodoscopic detectors
• On The Decaying-Sterile Neutrino Solution to the Electron (Anti)Neutrino Appearance Anomalies
• Heavy neutrino search in accelerator-based experiments
• CP violations in ${\pi }^{\pm }$ Meson Decay
• An allowed window for heavy neutral leptons below the kaon mass
• Complex Scalar DM in a B-L Model
• A little theory of everything, with heavy neutral leptons
• Exploring CP-Violating heavy neutrino oscillations in rare tau decays at Belle II
• Exploring CP-violation, via heavy neutrino oscillations, in rare B meson decays at Belle II
• Z-Boson Decays into Majorana or Dirac (Heavy) Neutrinos
• Constraining the $3-3-1$ model with heavy neutral leptons using $(g-2{)}_{\mu }$ and dark matter observables
• Discovering heavy neutrino oscillations in rare Bc meson decays at HL-LHCb