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Minimal Left-Right Symmetric Dark Matter.

Julian Heeck1, Sudhanwa Patra2,3

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Left-right symmetric models offer a straightforward path to stable TeV-scale dark matter. This stability is achieved without special symmetries, utilizing existing or accidental symmetries within the model framework.

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Area of Science:

  • Particle Physics
  • Cosmology
  • High Energy Physics

Background:

  • Dark matter remains a significant mystery in cosmology, with its particle nature yet to be identified.
  • Left-right symmetric models provide a theoretical framework for extending the Standard Model of particle physics.
  • Previous models often required ad hoc symmetries to stabilize dark matter candidates.

Purpose of the Study:

  • To demonstrate that left-right symmetric models can naturally accommodate stable dark matter particles at the TeV scale.
  • To explore minimal dark matter frameworks within these models.
  • To investigate the implications for recent experimental anomalies, such as the diboson excess at ATLAS.

Main Methods:

  • Investigating the stability of dark matter candidates within the context of left-right symmetry.
  • Analyzing minimal examples using left-right fermion triplets and quintuplets.
  • Examining the role of the unbroken Z_{2} subgroup of B-L symmetry.

Main Results:

  • Stable TeV-scale dark matter particles can be accommodated without additional stabilizing symmetries.
  • The stability arises either accidentally or from the residual Z_{2} symmetry.
  • Minimal examples like fermion triplets and quintuplets form viable two-component dark matter.
  • The framework is consistent with SU(2)×SU(2)×U(1) models explaining the ATLAS diboson excess.

Conclusions:

  • Left-right symmetric models offer a compelling and economical solution for dark matter.
  • The proposed mechanism simplifies dark matter model building by reducing the need for fine-tuning or extra symmetries.
  • This approach provides a testable framework with direct implications for ongoing and future high-energy physics experiments.