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Related Experiment Videos

Search for the decay K(L) --> pi(0)&mgr;(+)&mgr;(-)

Alavi-Harati1, Albuquerque, Alexopoulos

  • 1University of Arizona, Tucson, Arizona 85721 and University of California at Los Angeles, Los Angeles, California 90095, USA.

Physical Review Letters
|September 16, 2000
PubMed
Summary

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This summary is machine-generated.

Researchers searched for the rare K(L) to pi(0) mu(+) mu(-) decay. The study found two events, setting an upper limit on this decay

Area of Science:

  • Particle Physics
  • High Energy Physics
  • CP Violation Studies

Background:

  • The decay K(L) to pi(0) mu(+) mu(-) is sensitive to CP violation.
  • Direct measurement can test the Cabibbo-Kobayashi-Maskawa mechanism or indicate new physics.
  • Previous searches have constrained the branching ratio of this rare decay.

Purpose of the Study:

  • To search for the rare decay K(L) to pi(0) mu(+) mu(-).
  • To measure the branching ratio and test the Standard Model predictions for CP violation.
  • To constrain new physics scenarios beyond the Standard Model.

Main Methods:

  • Analysis of data from the KTeV experiment at Fermilab.
  • Selection criteria designed to identify K(L) to pi(0) mu(+) mu(-) events.

Related Experiment Videos

  • Background estimation using simulation and control samples.

    • Main Results:

    • Two candidate events were observed in the 1997 data.
    • The estimated background for these events was 0.87 +/- 0.15.
    • An upper limit on the branching ratio was set: B(K(L) to pi(0) mu(+) mu(-)) < 3.8 x 10^-10 at 90% confidence level.

    Conclusions:

    • The observed rate is consistent with the expected background.
    • The upper limit provides a constraint on CP violation models.
    • Further data or improved analysis may be needed to definitively observe this decay.