Abstract
We consider the collider signals arising from kinetic mixing between the hypercharge gauge boson of the Standard Model and its twin counterpart in the Mirror Twin Higgs model, in the framework in which the twin photon is massive. Through the mixing, the Standard Model fermions acquire charges under the mirror photon and the mirror Z boson. We determine the current experimental bounds on this scenario, and show that the mixing can be large enough to discover both the twin photon and the twin Z at the LHC, or at a future 100 TeV hadron collider, with dilepton resonances being a particularly conspicuous signal. We show that, in simple models, measuring the masses of both the mirror photon and mirror Z, along with the corresponding event rates in the dilepton channel, overdetermines the system, and can be used to test these theories.
Highlights
With the discovery of the Higgs boson at the Large Hadron Collider (LHC) [1,2], all the particles predicted by the Standard Model (SM) have been observed, and the search for new physics is well underway
We focus on the framework in which the discrete Z2 symmetry is COLLIDER SIGNALS OF THE MIRROR TWIN HIGGS BOSON
The Mirror Twin Higgs (MTH) framework predicts both a twin photon and a twin Z boson. These states can interact with the SM through kinetic mixing between the hypercharge gauge boson of the SM and its mirror counterpart
Summary
With the discovery of the Higgs boson at the Large Hadron Collider (LHC) [1,2], all the particles predicted by the Standard Model (SM) have been observed, and the search for new physics is well underway. Ultraviolet completions of the MTH based on compositeness generically introduce states charged under both SM and twin gauge groups, with the result that ε is expected to receive one-loop corrections of order 10−2–10−3 Such large values of ε can only be accommodated if the twin photon A0 is massive. A massive twin photon requires contributions to the masses of the mirror gauge bosons beyond those from electroweak symmetry breaking This can be accomplished either by introducing a mass term for the twin hypercharge gauge boson or by extending the Higgs sector. We outline the interactions of the neutral vector bosons in the MTH framework and study their production rates and branching fractions This is done for two scenarios: a model in which the twin hypercharge gauge boson is given an explicit Proca mass (THPM) and a twin two Higgs doublet model (T2HDM).
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