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Light Scalars and the Koto Anomaly.

Daniel Egana-Ugrinovic1, Samuel Homiller2, Patrick Meade2

  • 1Perimeter Institute for Theoretical Physics, Waterloo, Ontario N2L 2Y5, Canada.

Physical Review Letters
|May 30, 2020
PubMed
Summary

The KOTO experiment

Area of Science:

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

Background:

  • The KOTO experiment searches for rare Kaon decays.
  • An excess of events in K_{L}→π^{0}νν[over ¯] has been observed.
  • This excess may indicate new physics phenomena.

Purpose of the Study:

  • To investigate potential explanations for the KOTO excess.
  • To explore the role of weakly coupled scalars in Kaon decays.
  • To test specific theoretical models, namely the minimal Higgs portal and a hadrophilic scalar model.

Main Methods:

  • Theoretical analysis of scalar particle interactions.
  • Model building for new physics scenarios.
  • Comparison of model predictions with experimental data and constraints.

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Main Results:

  • Weakly coupled scalars produced from Kaon decays can explain the KOTO excess.
  • The minimal Higgs portal and hadrophilic scalar models are consistent with KOTO data.
  • These models satisfy existing experimental limits.

Conclusions:

  • The observed KOTO excess can be attributed to new physics.
  • Minimal Higgs portal and hadrophilic scalar models offer compelling explanations.
  • These models provide strong motivation for further investigation of the KOTO anomaly.