Resurrecting the Fraternal Twin WIMP Miracle
David Curtin, Shayne Gryba, Dan Hooper, Jakub Scholtz, Jack Setford

TL;DR
This paper modifies the Fraternal Twin Higgs model by introducing hypercharged scalars to reduce twin tau's direct detection cross section, making it a viable dark matter candidate detectable in future experiments.
Contribution
The paper proposes the $ ext{Z}_2$FTH model with hypercharged scalars that break twin electromagnetism, enabling the twin tau to be a consistent dark matter candidate with testable predictions.
Findings
Twin tau can have acceptable relic abundance and evade current direct detection bounds.
Large parts of the parameter space are accessible to upcoming direct detection experiments.
The model predicts observable signals in gamma rays, cosmic rays, and CMB measurements.
Abstract
In Twin Higgs models which contain the minimal particle content required to address the little hierarchy problem (i.e. fraternal models), the twin tau has been identified as a promising candidate for dark matter. In this class of scenarios, however, the elastic scattering cross section of the twin tau with nuclei exceeds the bounds from XENON1T and other recent direct detection experiments. In this paper, we propose a modification to the Fraternal Twin Higgs scenario that we call FTH, incorporating visible and twin hypercharged scalars (with ) which break twin electromagnetism. This leads to new mass terms for the twin tau that are unrelated to its Yukawa coupling, as well as additional annihilation channels via the massive twin photon. We show that these features make it possible for the right-handed twin tau to freeze out with an acceptable thermal relic abundance…
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