Dark matter in little Higgs model under current experimental constraints from LHC, Planck and Xenon

TL;DR

This paper assesses the viability of heavy photon dark matter in the littlest Higgs model with T-parity under current experimental constraints from LHC, Planck, and XENON, identifying parameter regions consistent with all data.

Contribution

It provides a comprehensive analysis of dark matter in the LHT model considering recent experimental results, highlighting viable parameter space and future detection prospects.

Findings

LHT consistent with CMS Higgs data but disfavored by ATLAS diphoton results.

Heavy photon can account for Planck relic density with small mirror lepton mass splitting.

Heavy photon cross section below XENON100 limit for masses above 95 GeV.

Abstract

We examine the status of dark matter (heavy photon) in the littlest Higgs model with T-parity (LHT) in light of the new results from the LHC Higgs search, the Planck dark matter relic density and the XENON100 limit on the dark matter scattering off the nucleon. We obtain the following observations: (i) For the LHC Higgs data, the LHT can well be consistent with the CMS results but disfavored by the ATLAS observation of diphoton enhancement; (ii) For the dark matter relic density, the heavy photon in the LHT can account for the Planck data for the small mass splitting of mirror lepton and heavy photon; (iii) For the dark matter scattering off the nucleon, the heavy photon can give a spin-independent cross section below the XENON100 upper limit for $m_{A_H}>95$ GeV ($f> 665$ GeV); (iv) A fit using the CMS Higgs data gives the lowest chi-square of 2.63 (the SM value is 4.75) at $f\simeq$ 1120 GeV and $m_{A_H}\simeq$ 170 GeV (at this point the dark matter constraints from Planck and XENON100 can also be satisfied). Such a best point and its nearby favored region (even for a $f$ value up to 3.8 TeV) can be covered by the future XENON1T (2017) experiment.