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Twin Higgs Asymmetric Dark Matter.

Isabel García García1, Robert Lasenby1, John March-Russell1,2

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This study proposes a novel asymmetric dark matter candidate, the spin-3/2 twin baryon (Δ′), within the twin Higgs model. This dark matter model successfully explains the observed dark matter-to-baryon ratio and has potential observable signatures.

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Area of Science:

  • Particle Physics
  • Cosmology
  • Dark Matter Physics

Background:

  • The little hierarchy problem is addressed by the minimal (fraternal) twin Higgs solution.
  • A twin sector with gauged SU(3)'×SU(2)' and a twin Higgs doublet is considered.
  • Focus is on the light b' quark regime within the twin sector.

Purpose of the Study:

  • Investigate asymmetric dark matter (ADM) within the twin Higgs framework.
  • Identify viable dark matter candidates arising from a twin baryon number asymmetry.
  • Explore the properties and detection signatures of proposed dark matter candidates.

Main Methods:

  • Utilizing the minimal (fraternal) twin Higgs model with specific gauge groups and fermion content.
  • Analyzing the consequences of a twin baryon number asymmetry.
  • Considering the formation of twin atoms (Δ′-τ′ bound states) as ADM candidates.

Main Results:

  • A spin-3/2 twin baryon (Δ′) emerges as a successful dark matter candidate.
  • The dynamically determined mass of Δ′ falls within the preferred range for the dark matter-to-baryon ratio.
  • Twin atoms (Δ′-τ′ bound states) are viable ADM candidates in certain parameter spaces, potentially altering dark matter halo properties.

Conclusions:

  • The proposed twin Higgs model provides a compelling explanation for asymmetric dark matter.
  • The spin-3/2 twin baryon and twin atoms are promising dark matter candidates with testable implications.
  • Direct detection signatures are consistent with current bounds, with possible modifications from dark form factors.