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Coupling QCD-Scale Axionlike Particles to Gluons.

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  • 1Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot, Israel 7610001.

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|August 7, 2019
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We developed a new data-driven method to calculate axionlike particle (ALP) interactions within Quantum Chromodynamics (QCD). This approach accurately predicts ALP production and decay rates, aiding in understanding ALP phenomenology.

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Area of Science:

  • Particle Physics
  • High Energy Physics
  • Quantum Chromodynamics

Background:

  • Axionlike particles (ALPs) are hypothetical particles with potential connections to dark matter and early universe physics.
  • Understanding the interactions of ALPs, particularly with hadrons, is crucial for their experimental detection and theoretical modeling.
  • Existing methods for calculating ALP-hadronic interactions are limited, especially for ALPs with QCD-scale masses.

Purpose of the Study:

  • To introduce a novel data-driven computational method for determining ALP-hadronic interaction strengths.
  • To enable precise calculations of ALP production and decay rates, including exclusive final states.
  • To explore the phenomenological implications of QCD-scale ALPs, focusing on dominant ALP-gluon couplings.

Main Methods:

  • Development of a data-driven framework to compute ALP-hadron interaction strengths.
  • Application of the method to calculate hadronic production and decay rates for ALPs.
  • Analysis of ALP phenomenology with a focus on scenarios with dominant ALP-gluon coupling.
  • Generalization of the method for arbitrary ALP couplings to Standard Model particles.

Main Results:

  • The proposed method allows for the calculation of hadronic production and decay rates of axionlike particles (ALPs).
  • It accurately predicts numerous ALP decay rates into exclusive final states.
  • Calculations for eta_c (ηc) decays into two vector mesons (VV) are consistent with experimental data.

Conclusions:

  • The novel data-driven method provides a powerful tool for studying QCD-scale ALPs.
  • The approach is versatile and can be extended to various ALP coupling scenarios.
  • The results offer valuable insights into ALP phenomenology and experimental searches.