Eur. Phys. J. C (2018) 78: 613
https://doi.org/10.1140/epjc/s10052-018-6067-7

Regular Article - Theoretical Physics

Signals of new gauge bosons in gauged two higgs doublet model

¹ Fakultät für Physik, Technische Universität Dortmund, 44221, Dortmund, Germany
² CP3-Origins, University of Southern Denmark, Campusvej 55, 5230, Odense M, Denmark
³ Physics Division, National Center for Theoretical Sciences, Hsinchu, 300, Taiwan
⁴ Department of Physics, National Tsing Hua University, Hsinchu, 300, Taiwan
⁵ Institute of Physics, Academia Sinica, Nangang, Taipei, 11529, Taiwan

^* e-mail: timluyu@hotmail.com

Received: 24 October 2017
Accepted: 13 July 2018
Published online: 31 July 2018

Abstract

Recently a gauged two Higgs doublet model, in which the two Higgs doublets are embedded into the fundamental representation of an extra local group, was constructed. Both the new gauge bosons and are electrically neutral. While can be singly produced at colliders, , which is heavier, must be pair produced. We explore the constraints of using the current Drell–Yan type data from the Large Hadron Collider. Anticipating optimistically that can be discovered via the clean Drell–Yan type signals at a 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 . For the 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 features distinguishable 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.