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Search for the rare decay K(L)-->pi(0)e(+)e(-).

A Alavi-Harati1, T Alexopoulos, M Arenton

  • 1University of Wisconsin, Madison, Wisconsin 53706, USA.

Physical Review Letters
|August 25, 2004
PubMed

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Summary

The KTeV experiment searched for the rare kaon decay K(L)-->pi(0)e(+)e(-), a process sensitive to new physics. The study set a new upper limit on this decay

Area of Science:

  • Particle Physics
  • High Energy Physics
  • Rare Kaon Decays

Background:

  • The decay K(L)-->pi(0)e(+)e(-) is a rare kaon decay mode.
  • This decay is sensitive to CP violation and potential new physics beyond the Standard Model.
  • Previous measurements have constrained the branching ratio of this decay.

Purpose of the Study:

  • To search for the rare kaon decay K(L)-->pi(0)e(+)e(-).
  • To measure the branching ratio of this decay mode.
  • To test the predictions of the Standard Model and search for evidence of new physics.

Main Methods:

  • Utilized data from the KTeV/E799 experiment at Fermilab.
  • Analyzed data from the 1999-2000 run, combined with 1997 data.
  • Searched for the K(L)-->pi(0)e(+)e(-) decay signature.

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Main Results:

  • Observed one event with an expected background of 0.99+/-0.35 events.
  • Set a preliminary limit on the branching ratio of 3.5x10(-10) at the 90% confidence level.
  • The final combined KTeV result yields BR(K(L)-->pi(0)e(+)e(-))<2.8x10(-10) at 90% C.L.

Conclusions:

  • The rare kaon decay K(L)-->pi(0)e(+)e(-) has been investigated.
  • A stringent upper limit on the branching ratio has been established.
  • The results constrain new physics scenarios and provide a precise test of the Standard Model.