2007/09/30 by Wensheng Li, Wen-sheng Li, Peng‐Fei Yin +2 · 1 citation
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #hep-ex #hep-ph
paper · pdf · doi:10.1103/physrevd.76.095012
published as Phys.Rev.D76:095012,2007 · 9 pages, revtex4, typo corrected
arxiv created 2007/10/07 · openalex publication_date 2007/11/27 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The Higgs sector may play an important role in detecting mirror particles, which can be the candidates of dark matter and appear as missing energy in the detectors at the LHC. In this paper we worked out the Higgs boson spectrum and the Higgs couplings for the symmetric vacuum, namely v1=v2=v, in the mirror model, and investigated the constraints from electroweak precision observables. Our study showed that electroweak precision observables have already constrained the Higgs boson sector severely. We then explored the Higgs boson phenomenology, and focused on the scenario that the heavier Higgs boson H can decay into a pair of lighter Higgs bosons h. We proposed to study the invisible decay of the Higgs boson via the pair production of them, in which one Higgs boson decays into bottom quarks and the other decays invisibly. Our detail simulation for signals and backgrounds showed that the observation of the signal can reach 5\ensuremathσ significance for mH=260 GeV and mh=115 GeV with 10 fb^\ensuremath-1 integrated luminosity at the LHC. Moreover the possible method to further suppress dominant Zbb background was discussed. We also simulated the signals and backgrounds for H\ensuremath→hh\ensuremath→4b. Our results showed that it is very difficult to isolate the signals from huge QCD continuum backgrounds.