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Search for the decay KL --> pi(0)e+e-.

A Alavi-Harati1, I F Albuquerque, T Alexopoulos

  • 1University of Arizona, Tucson 85721, USA.

Physical Review Letters
|February 15, 2001
PubMed

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Summary

Researchers searched for the rare KL to pi(0)e+e- decay. The study set an upper limit on the branching ratio, B(KL to pi(0)e+e-) < 5.1 x 10(-10), providing insights into CP violation and potential new physics.

Area of Science:

  • Particle Physics
  • High Energy Physics
  • CP Violation

Background:

  • The decay KL to pi(0)e+e- is a key process for studying CP violation.
  • Understanding this decay can test the Standard Model, specifically the Cabibbo-Kobayashi-Maskawa mechanism.
  • Deviations from predictions may indicate the presence of new physics beyond the Standard Model.

Purpose of the Study:

  • To search for the rare decay KL to pi(0)e+e-.
  • To measure the branching ratio of this decay.
  • To constrain theoretical models of CP violation.

Main Methods:

  • The search was conducted using data from the KTeV/E799 experiment at Fermilab.
  • Analysis focused on identifying the specific signature of the KL to pi(0)e+e- decay.

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  • Statistical methods were employed to determine the significance of any observed events and set limits.

    • Main Results:

    • Two candidate events for the KL to pi(0)e+e- decay were observed in the 1997 data.
    • The expected background for these events was calculated to be 1.06 +/- 0.41.
    • An upper limit on the branching ratio was established at B(KL to pi(0)e+e-) < 5.1 x 10(-10) at the 90% confidence level.

    Conclusions:

    • The observed rate is consistent with the expected background, providing no evidence for the decay.
    • The upper limit set on the branching ratio places constraints on theoretical models.
    • This result contributes to the ongoing investigation of CP violation and the search for new physics.