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Signature of heavy Majorana neutrinos at a linear collider: Enhanced charged Higgs pair production

David Atwood^1,*, Shaouly Bar-Shalom^2,†, and Amarjit Soni^3,‡

¹Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
²Physics Department, Technion-Institute of Technology, Haifa 32000, Israel
³Theory Group, Brookhaven National Laboratory, Upton, New York 11973, USA

^*atwood@iastate.edu
^†shaouly@physics.technion.ac.il
^‡soni@bnl.gov

Phys. Rev. D 76, 033004 – Published 21 August, 2007

DOI: https://doi.org/10.1103/PhysRevD.76.033004

Abstract

A charged Higgs pair can be produced at an $e e$ collider through a $t$ -channel exchange of a heavy neutrino ( $N$ ) via $e^{+} e^{-} \to H^{+} H^{-}$ and, if $N$ is a Majorana particle, also via the lepton number violating (LNV) like-sign reaction $e^{\pm} e^{\pm} \to H^{\pm} H^{\pm}$ . Assuming no a priori relation between the effective $e N H^{+}$ coupling ( $ξ$ ) and light neutrino masses, we show that this interaction vertex can give a striking enhancement to these charged Higgs pair production processes. In particular, the LNV $H^{-} H^{-}$ signal can probe $N$ at the International Linear Collider (ILC) in the mass range $100 GeV ≲ m_{N} ≲ 10^{4} TeV$ and with the effective mixing angle $ξ$ in the range $10^{- 4} ≲ ξ^{2} ≲ 10^{- 8}$ —well within its perturbative unitarity bound and the $β β_{0 ν}$ limit. The lepton number conserving $e^{+} e^{-} \to H^{+} H^{-}$ mode can be sensitive to, e.g., an $O (10) TeV$ heavy Majorana neutrino at a 500 GeV ILC, if $ξ^{2} ≳ 0.001$ .

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Signature of heavy Majorana neutrinos at a linear collider: Enhanced charged Higgs pair production

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