Phenomenology in supersymmetric neutrinophilic Higgs model with sneutrino dark matter

TL;DR

This paper explores a supersymmetric neutrinophilic Higgs model with Dirac neutrinos, where the lightest right-handed sneutrino serves as dark matter, and discusses constraints and phenomenological implications including muon g-2 and dark radiation.

Contribution

It introduces a novel supersymmetric neutrinophilic Higgs model with large neutrino Yukawa couplings and analyzes its dark matter and collider phenomenology.

Findings

Neutrinophilic Higgs bosons must be heavy due to muon decay and dark radiation constraints.

RH sneutrino can be a viable dark matter candidate, either asymmetric or WIMP.

The model can explain the muon g-2 anomaly with appropriate parameter tuning.

Abstract

We study a supersymmetric neutrinophilic Higgs model with large neutrino Yukawa couplings where neutrinos are Dirac particles and the lightest right-handed (RH) sneutrino is the lightest supersymmetric particle (LSP) as a dark matter candidate. Neutrinophilic Higgs bosons need to be rather heavy by the precise determination of the muon decay width and dark radiation constraints for large Yukawa couplings. From the Large Hadron Collider constraints, neutrinophilic Higgsino mass need to be heavier than several hundred GeV or close to the RH sneutrino LSP mass. The latter case is interesting because the muon anomalous magnetic dipole moment can be explained with a relatively large lightest neutrino mass, if RH sneutrino mixings are appropriately fine tuned in order to avoid stringent lepton flavor violation constraints. Dark matter is explained by asymmetric RH sneutrino dark matter in the favoured region by the muon anomalous magnetic dipole moment. In other regions, RH sneutrino could be an usual WIMP dark matter.