Heavy Neutrino Search via the Higgs boson at the LHC

Abstract

In the inverse see-saw model the effective neutrino Yukawa couplings can be sizable due to a large mixing angle between the light $(\nu )$and heavy neutrinos $(N)$. When the right handed neutrino $(N)$ can be lighter than the Standard Model (SM) Higgs boson $(h)$. It can be produced via the on-shell decay of the Higgs, $h\to N\nu$ at a significant branching fraction at the LHC. In such a process $N$ mass can be reconstructed in its dominant $N\to W\ell$ decays. We perform an analysis on this channel and its relevant backgrounds, among which the $W+$jets background is the largest. Considering the existing mixing constraints from the Higgs and electroweak precision data, the best sensitivity of the heavy neutrino search is achieved for benchmark $N$ mass at 100 and 110 GeV for upcoming high luminosity LHC runs.

22 pages, 7 Figures, updated analysis, model part extended, matched journal version in EPJC

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• Measuring the heavy neutrino oscillations in rare W boson decays at the Large Hadron Collider
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• Sensitivity limits on heavy-light mixing $|U_{\mu N}{|}^2$ from lepton number violating $B$ meson decays
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• A renormalizable left-right symmetric model with low scale seesaw mechanisms
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• Testing electroweak scale seesaw models at $e^{-}\gamma$ and $\gamma \gamma$ colliders
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• Probing sterile neutrino in $B$ ($D$) meson decays at Belle II (BESIII)
• Testing tree level TeV scale seesaw scenarios in $\mu$TRISTAN
• $\nu$ Electroweak Baryogenesis: The Scalar Singlet Strikes Back
• Phenomenology of Higgs bosons in inverse seesaw model with Type-X two Higgs doublet at the LHC
• Radiative Symmetry breaking, Cosmic Strings and Observable Gravity Waves in $U(1{)}_R$ symmetric $SU(5)\times U(1{)}_{\chi }$
• Discovering heavy neutrino oscillations in rare Bc meson decays at HL-LHCb
• Heavy Neutrino Searches via Same-sign Lepton Pairs at the Higgs Factory
• CP violation with GeV-scale Majorana neutrino in ${\Lambda }_b\to ({\Lambda }_c^{+},p^{+}){\pi }^{+}{\mu }^{-}{\mu }^{-}$ decays
• Search for heavy Majorana neutrinos in the $\tau$ final state at proton-electron colliders
• Sterile neutrinos in ${\Lambda }_b^0\to ({\Lambda }_c^{+},p^{+}){\ell }_1^{-}{\ell }_2^{-}{\ell }_3^{+}\nu$ decays
• An extended 3-3-1 model with two scalar triplets and linear seesaw mechanism
• Probe the Mixing Parameter $|V_{\tau N}{|}^2$ for Heavy Neutrinos
• Leptogenesis Constraints on $B-L$ breaking Higgs Boson in TeV Scale Seesaw Models
• CP violation in the rare Higgs decays via exchange of on-shell almost degenerate Majorana neutrinos, $H\to {\nu }_k{N}_j\to {\nu }_k{\ell }^{-}U\bar{D}$ and $H\to {\nu }_k{N}_j\to {\nu }_k{\ell }^{+}\bar{U}D$