Spontaneous Mirror Parity Violation, Common Origin of Matter and Dark Matter, and the LHC Signatures

TL;DR

This paper explores a mirror world hypothesis where spontaneous mirror parity violation explains matter-antimatter asymmetry and dark matter origin, with testable predictions at the LHC and direct detection experiments.

Contribution

It introduces a model with spontaneous mirror parity breaking, linking matter and dark matter origins, and predicts distinctive Higgs signatures and dark matter detection prospects.

Findings

Mirror world with GeV-scale dark matter candidate is consistent with cosmological constraints.

Predicted non-standard Higgs bosons have signatures detectable at the LHC.

Mirror dark matter can be directly detected by TEXONO and CDEX experiments.

Abstract

Existence of a mirror world in the universe is a fundamental way to restore the observed parity violation in weak interactions and provides the lightest mirror nucleon as a unique GeV-scale dark matter particle candidate. The visible and mirror worlds share the same spacetime of the universe and are connected by a unique space-inversion symmetry -- the mirror parity (P). We conjecture that the mirror parity is respected by the fundamental interaction Lagrangian, and study its spontaneous breaking from minimizing the Higgs vacuum potential. The domain wall problem is resolved by a unique soft breaking linear-term from the P-odd weak-singlet Higgs field. We also derive constraint from the Big-Bang nucleosynthesis. We then analyze the neutrino seesaw for both visible and mirror worlds, and demonstrate that the desired amounts of visible matter and mirror dark matter in the universe arise from a common origin of CP violation in the neutrino sector via leptogenesis. We derive the Higgs mass-spectrum and Higgs couplings with gauge bosons and fermions. We show their consistency with the direct Higgs searches and the indirect precision constraints. We further study the distinctive signatures of the predicted non-standard Higgs bosons at the LHC. Finally, we analyze the direct detections of GeV-scale mirror dark matter by TEXONO and CDEX experiments.