Signals of New Gauge Bosons in Gauged Two Higgs Doublet Model

Preprint number: CP3-Origins-2017-31 DNRF90
Authors: Wei-Chih Huang (Technische Universität Dortmund & CP3-Origins), Hiroyuki Ishida (National Center for Theoretical Sciences, Taiwan), Chih-Ting Lu (National Tsing Hua University), Yue-Lin Sming Tsai (National Center for Theoretical Sciences, Taiwan), and Tzu-Chiang Yuan (National Center for Theoretical Sciences, Taiwan & Academia Sinica)
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Recently a gauged two Higgs doublet model, in which the two Higgs doublets are embedded into the fundamental representation of an extra local SU(2)H group, is constructed. Both the new gauge bosons Z′ and W′(p,m) are electrically neutral. While Z′ can be singly produced at colliders, W′(p,m), which is heavier, must be pair produced. We explore the constraints of Z′ using the current Drell-Yan type data from the Large Hadron Collider. Anticipating optimistically that Z′ can be discovered via the clean Drell-Yan type signals at high luminosity upgrade of the collider, we explore the detectability of extra heavy fermions in the model via the two leptons/jets plus missing transverse energy signals from the exotic decay modes of Z′. For the W′(p,m) pair production in a future 100 TeV proton-proton collider, we demonstrate certain kinematical distributions for the two/four leptons plus missing energy signals have distinguishable features from the Standard Model background. In addition, comparisons of these kinematical distributions between the gauged two Higgs doublet model and the littlest Higgs model with T-parity, the latter of which can give rise to the same signals with competitive if not larger cross sections, are also presented.