Abstract
In the Littlest Higgs model with T-parity (LHT), the T-odd heavy photon (A H ) is weakly interacting and can play the role of dark matter. We investigate the lower limit on the mass of A H dark matter under the constraints from Higgs data, EWPOs, R b , Planck 2015 dark matter relic abundance, PandaX-II/LUX 2016 direct detections and LHC-8 TeV monojet results. We find that (1) Higgs data, EWPOs and R b can exclude the mass of A H up to 99 GeV. To produce the correct dark matter relic abundance, A H has to co-annihilate with T-odd quarks (q H ) or leptons (ℓ H ); (2) the LUX (PandaX-II) 2016 data can further exclude \( {m}_{A_H} \) < 380(270) GeV for ℓ H -A H co-annihilation and \( {m}_{A_H} \) < 350(240) GeV for q H − A H co-annihilation; (3) LHC-8 TeV monojet result can give a strong lower limit, \( {m}_{A_H} \) > 540 GeV, for q H -A H co-annihilation; (4) future XENON1T(2017) experiment can fully cover the parameter space of ℓ H -A H co-annihilation and will push the lower limit of \( {m}_{A_H} \) up to about 640 GeV for q H -A H co-annihilation.
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Wu, L., Yang, B. & Zhang, M. Little Higgs dark matter after PandaX-II/LUX-2016 and LHC Run-1. J. High Energ. Phys. 2016, 152 (2016). https://doi.org/10.1007/JHEP12(2016)152
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DOI: https://doi.org/10.1007/JHEP12(2016)152