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High Quality QCD Axion and the LHC.

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This study explores a heavy axion solution to the strong CP problem, proposing it can be detected at the Large Hadron Collider (LHC) as a long-lived particle (LLP). The research highlights unique signals for axion detection amidst background noise.

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Area of Science:

  • Particle Physics
  • Cosmology
  • High Energy Physics

Background:

  • The strong CP problem in Quantum Chromodynamics (QCD) is addressed by the QCD axion.
  • Minimal axion models face the
  • axion quality problem
  • which can be resolved by introducing a mirror sector with Z_{2} symmetry.

Purpose of the Study:

  • To investigate a robust realization of the QCD axion in a model with a mirror sector.
  • To explore the potential of this
  • heavy axion
  • to be detected as a long-lived particle (LLP) at the Large Hadron Collider (LHC).

Main Methods:

  • Theoretical analysis of a QCD axion model with a softly broken Z_{2} symmetry and a mirror sector.
  • Investigating the production and decay signatures of the heavy axion at hadron colliders.
  • Analyzing the feasibility of distinguishing axion decay signals from background processes at the LHC.

Main Results:

  • The proposed heavy axion model satisfies theoretical and observational constraints.
  • The heavy axion possesses a large, unexplored parameter space amenable to LHC searches.
  • The unique hadronic decay signal of the axion can be identified against background noise in the long-lived particle regime.

Conclusions:

  • The study establishes a new avenue for discovering axions at accelerators.
  • Singly produced long-lived particles (LLPs) offer a promising search channel at the LHC.
  • This research expands the scope of observable axion physics in high-energy collider experiments.