The impossibility of heavy neutrino dark matter in the Littlest Higgs Model with T-parity: constraints from direct search

TL;DR

This paper demonstrates that current direct dark matter search experiments exclude the possibility of heavy neutrino dark matter within the Littlest Higgs Model with T-parity, challenging its viability as a dark matter candidate.

Contribution

The study provides the first comprehensive analysis showing that experimental constraints rule out heavy neutrino dark matter in the LHT model.

Findings

CDMS and Xenon10 exclude the entire parameter space for heavy neutrino LTP in LHT

Heavy neutrino dark matter in LHT is incompatible with current direct detection limits

Reopens the question of dark matter candidates in the LHT framework

Abstract

We consider the Littlest Higgs Model with T-parity (LHT), in the parameter region where a heavy neutrino is the lightest T-odd particle (LTP). Having emphasized that this corresponds to a sizable region in the parameter space of the theory, we show that both the Cryogenic Dark Matter Search (CDMS) and Xenon10 experiments disallow the entire region where the masses of the new particles in LHT can lie within several TeV. Therefore, any observation of the signals of a heavy neutrino LTP is likely to seriously reopen the issue of cold dark matter in the universe.