2014/09/30 by Yao-Bei Liu, Zhen-Jun Xiao
Physics and Astronomy · #hep-ph #hep-ex
paper · pdf · doi:10.1088/0954-3899/42/5/055004
published as J.Phys.G42 (2015) 055004 · 15 pages, 6 figures and 2 Tables. Text modified slightly. The final version published in J.Phys.G. arXiv admin note: text overlap with arXiv:1003.4492 by other authors
arxiv created 2015/03/20 · arxiv updated 2015/03/23
In the left-right twin Higgs (LRTH) model, the neutral S is a candidate for weakly interacting massive particle (WIMP) dark matter (DM). If its mass is lighter than half of the SM-like Higgs boson h, the new invisible decay h → SS will become open. In this paper, we examine the status of a light dark matter (S) under current experimental constraints including the latest LHC Higgs data, the XENON100 and LUX limit on the dark matter scattering off the nucleon. The following observations have been obtained: (i) The current ATLAS (CMS) measurements of Rγγ can exclude the invisible Higgs branching ratio \rm Br\rm inv larger than 34% (48%) at 2σ level; (ii) the Global fits to the latest LHC and Tevatron Higgs data provide a stronger constraint: \rm Br\rm inv< 20% (30%) at 2σ (3σ) level, which could be tested in the LHC experiments; (iii) for the spin-independent scattering cross section off the nucleon, the recent XENON100 (LUX) data can exclude the invisible decay rate larger than 50% (25%); and (iv) the results of direct DM searches with LUX can give strong constraint on the viable parameter space of \g_hSS, m_S\ in this LRTH model.