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Long-lived heavy neutrinos from Higgs decays

  • Frank F. Deppisch
  • Wei Liu
  • Manimala MitraEmail author
Open Access
Regular Article - Theoretical Physics

Abstract

We investigate the pair-production of right-handed neutrinos via the Standard Model (SM) Higgs boson in a gauged BL model. The right-handed neutrinos with a mass of few tens of GeV generating viable light neutrino masses via the seesaw mechanism naturally exhibit displaced vertices and distinctive signatures at the LHC and proposed lepton colliders. The production rate of the right-handed neutrinos depends on the mixing between the SM Higgs and the exotic Higgs associated with the BL breaking, whereas their decay length depends on the active-sterile neutrino mixing. We focus on the displaced leptonic final states arising from such a process, and analyze the sensitivity reach of the LHC and proposed lepton colliders in probing the active-sterile neutrino mixing. We show that mixing to muons as small as VμN ≈ 10−7 can be probed at the LHC with 100 fb−1 and at proposed lepton colliders with 5000 fb−1. The future high luminosity run at LHC and the proposed MATHUSLA detector may further improve this reach by an order of magnitude.

Keywords

Beyond Standard Model Neutrino Physics Higgs Physics 

Notes

Open Access

This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

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Copyright information

© The Author(s) 2018

Authors and Affiliations

  1. 1.University College LondonLondonU.K.
  2. 2.Institute of Physics (IOP)BhubaneswarIndia
  3. 3.Homi Bhabha National Institute, Training School ComplexMumbaiIndia

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