Abstract
The Twin Higgs mechanism keeps the scalar sector of the Standard Model (SM) natural while remaining consistent with the non-observation of new colored particles at the Large Hadron Collider (LHC). In this construction the heavy twin Higgs boson provides a portal between the SM particles and the twin sector, but is quite challenging to discover at colliders. In the Fraternal Twin Higgs setup, where light twin quarks are absent, we study a novel discovery channel for the heavy twin Higgs boson by considering its decay to a pair of light Higgs bosons, one of which subsequently decays to glueball states in the twin sector, leading to displaced vertex signatures. We estimate the sensitivity of existing LHC searches in this channel, and assess the discovery potential of the high luminosity (HL) LHC. We show that the glueballs probed by these searches are outside the sensitivity of existing searches for exotic decays of the light Higgs boson. In addition, we demonstrate that the displaced signals we consider probe a region of heavy Higgs masses beyond the reach of prompt signals. We also comment on the possibility of probing the input parameters of the microscopic physics and providing a way to test the Twin Higgs mechanism with this channel.
Highlights
Since the discovery of the Higgs boson [1,2], a dedicated experimental program has sprung up to determine its properties
Considering the Standard Model (SM) as an effective field theory (EFT), one would generically expect an elementary scalar to have a mass near the cutoff of the theory, or equivalently the scale of new physics, unless protected by a symmetry [3,4,5]
Even if new states appearing at that scale cancel the UV sensitivity to higher energies, there remains the little hierarchy problem connected to the tuning required for a light Higgs boson below the scale of new physics
Summary
Since the discovery of the Higgs boson [1,2], a dedicated experimental program has sprung up to determine its properties. The decay modes of this heavy twin Higgs were discussed in FTH-like contexts [27,36] and its LHC phenomenology has been recently explored [37,38] These studies confirm the difficulty of using conventional collider searches to discover the heavy twin Higgs. The glueballs, if discovered, would offer valuable insight into the nature of the twin sector Their mass and decay length can yield information about the running of the twin QCD coupling as well as the magnitude of the coupling between the light Higgs and the twin quarks, potentially offering a consistency check of the Z2 symmetry structure of the underlying theory.
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