Resurrecting the fraternal twin WIMP miracle

Journal Article · Fri Feb 25 00:00:00 EST 2022 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.105.035033· OSTI ID:1846498

Curtin, David; Gryba, Shayne ; Setford, Jack; Hooper, Dan ; Scholtz, Jakub

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 $$\mathbb{Z}_2$$FTH, incorporating visible and twin hypercharged scalars (with $Y = 2$) 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 while scattering with nuclei at a rate that is well below existing constraints. Nonetheless, large portions of the currently viable parameter space in this model are within the reach of planned direct detection experiments. The prospects for indirect detection using gamma rays and cosmic-ray antiprotons are also promising in this model. Furthermore, if the twin neutrino is light, the predicted deviation of $$\Delta N_\mathrm{eff} \approx 0.1$$ would be within reach of Stage 4 CMB experiments. Finally, the high luminosity LHC should be able to probe the entire parameter space of the $$\mathbb{Z}_2$$FTH model through charged scalar searches. We also discuss how searches for long-lived particles are starting to constrain Fraternal Twin Higgs models.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Grant/Contract Number: AC02-07CH11359
• OSTI ID: 1846498
• Alternate ID(s): OSTI ID: 1831896
• Report Number(s): FERMILAB-PUB-21-294-T; arXiv:2106.12578; PRVDAQ; 035033
• Journal Information: Physical Review D, Journal Name: Physical Review D Vol. 105 Journal Issue: 3; ISSN 2470-0010
• Publisher: American Physical Society
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS