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Giacomo Cacciapaglia1, Aldo Deandrea1,2, Michio Hashimoto3

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A new pseudoscalar particle, eta(WZ), may explain diboson excesses at the Large Hadron Collider. Produced via gluon fusion, it decays into two weak bosons, offering insights into new physics beyond the Standard Model.

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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Beyond Standard Model Physics

Background:

  • Recent diboson resonant excesses observed by ATLAS and CMS experiments.
  • Need for new physics explanations beyond the Standard Model.

Purpose of the Study:

  • Propose a new weak singlet pseudoscalar particle, eta(WZ), as an explanation for diboson excesses.
  • Investigate the decay of eta(WZ) into two weak bosons.
  • Explore production via gluon fusion at the Large Hadron Collider (LHC).

Main Methods:

  • Study an effective model based on the Wess-Zumino-Witten anomaly term.
  • Analyze anomalous couplings to gauge bosons.
  • Relate anomalous coupling coefficients to underlying composite state dynamics.

Main Results:

  • The proposed eta(WZ) particle can decay into two weak bosons.
  • Production via gluon fusion is a feasible mechanism at the LHC.
  • Anomalous couplings can be derived from a Wess-Zumino-Witten term.

Conclusions:

  • The eta(WZ) particle provides a well-motivated phenomenological model for diboson excesses.
  • The model offers a testable framework for exploring composite pseudoscalar states.
  • Further experimental data is needed to confirm the existence and properties of eta(WZ).