Probing the Decoupled Seesaw Scalar in Rare Higgs Decay

Abstract

The Higgs boson can mix with a singlet scalar that dynamically generates the Majorana mass of the right-handed neutrino $N_R$. We show that even a tiny mixing between the Higgs boson and a `decoupled' singlet scalar allows for Higgs-mediated pair production of $N_R$ without significant mixings between the active neutrinos and $N_R$, and thus testable at colliders via a characteristic signal of two same-sign same-flavor lepton pairs, plus missing energy. We demonstrate that this search channel is mostly background-free in $pp$-collision and can be a highly sensitive probe of the Higgs-singlet mixing at the current and future $pp$ colliders. Such channel provides a clean signal to discover the singlet scalar and explore the origin of neutrino masses.

arXiv comment16 pages, 7 figures, 2 tables

References in corpus (26)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Gauge Singlet Scalars as Cold Dark Matter
• The Search for Heavy Majorana Neutrinos
• Measuring masses of semi-invisibly decaying particles pair produced at hadron colliders
• TMVA - Toolkit for Multivariate Data Analysis
• m_T2 : the truth behind the glamour
• Gauge singlet scalar as inflaton and thermal relic dark matter
• Vacuum Stability, Perturbativity, and Scalar Singlet Dark Matter
• Minimal Kinematic Constraints and MT2
• The Electroweak Phase Transition in a Nonminimal Supersymmetric Model
• Search for doubly charged Higgs boson production in multi-lepton final states with the ATLAS detector using proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Delta r and the W-boson mass in the Singlet Extension of the Standard Model
• Electroweak Baryogenesis in the Next to Minimal Supersymmetric Model
• Lepton Number Violation in Higgs Decay at LHC
• Sterile neutrinos in leptonic and semileptonic decays
• Improving Electro-Weak Fits with TeV-scale Sterile Neutrinos
• The Standard Model Higgs Boson-Inflaton and Dark Matter
• Search for heavy Majorana neutrinos in same-sign dilepton channels in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Search for heavy Majorana or Dirac neutrinos and right-handed $W$ gauge bosons in final states with two charged leptons and two jets at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• Majorana Higgses at colliders
• Type-II Seesaw Scalar Triplet Model at a 100 TeV $pp$ Collider: Discovery and Higgs Portal Coupling Determination
• Higgs Couplings and Naturalness in $\lambda$-SUSY
• Collider signatures of sterile neutrinos in models with a gauge-singlet Higgs
• CP-even scalar boson production via gluon fusion at the LHC

Cited by in corpus (4)

• Testing the seesaw mechanisms via displaced right-handed neutrinos from a light scalar at the HL-LHC
• Heavy Neutrino Searches via Same-sign Lepton Pairs at the Higgs Factory
• Search for heavy Majorana neutrinos in the $\tau$ final state at proton-electron colliders
• Probe the Mixing Parameter $|V_{\tau N}{|}^2$ for Heavy Neutrinos