# 10ᵗʰ Anniversary Special Edition

10-12 January 2018
Centre for Particle Theory, Durham
Europe/London timezone

## Long-lived Heavy Neutrinos from Higgs Decays

12 Jan 2018, 11:10
20m
Centre for Particle Theory, Durham

#### Centre for Particle Theory, Durham

IPPP & Dept. Mathematical Sciences Durham University South Road Durham DH1 3LE

Mr Wei Liu (UCL)

### Description

We investigate the pair-production of low mass right handed neutrino and its possible decays in a gauged $B-L$ model. The right handed neutrino of mass few tens of GeV that generates viable light neutrino masses through seesaw can lead to displaced vertices and distinctive leptonic signatures at LHC and future lepton colliders. The production of such low mass right handed neutrino depends on the mixing between SM and gage singlet Higgs state, whereas the decay length depends on the active-sterile neutrino mixing. We focus on the semi-leptonic final states arising from such a decay, and analyze the sensitivity reach of LHC and future linear colliders in probing active-sterile neutrino mixing. We show that the active-sterile neutrino mixing as small as $V_{\mu N} \sim \mathcal{O}(10^{-7})$ can be probed at 13 TeV LHC with 100 $\rm{fb}^{-1}$ luminosity and at leptonic colliders with 5000 $\rm{fb}^{-1}$ luminosity. The high-luminosity run of LHC and future experiment MATHUSLA can further improve this reach by one more magnitude.
What would be the preferred length of your talk? 20 minutes + questions

### Primary authors

Dr Frank Deppisch (University College London) Dr Manimala Mitra (Institute of Physics, Bhubaneswar) Mr Wei Liu (UCL)

 Slides