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Measurements of the Decay KL-->e+ e- mu+ mu-
A Alavi-Harati1, T Alexopoulos, M Arenton
1University of Wisconsin, Madison, Wisconsin 53706, USA.
Physical Review Letters
|May 7, 2003
Summary
The KTeV experiment observed rare K(L) decays into electron-positron and muon-antimuon pairs. This study provides a precise branching ratio and the first measurement of a key parameter in the D
Area of Science:
- Particle Physics
- High Energy Physics
- Rare Kaon Decays
Background:
- Rare decays provide sensitive probes of the Standard Model.
- Understanding K(L) decays is crucial for testing fundamental symmetries.
Purpose of the Study:
- To measure the branching ratio of the K(L)-->e+ e- mu+ mu- decay.
- To perform the first measurement of the DIP parameter alpha using this decay mode.
- To set limits on CP and lepton violation.
Main Methods:
- Analysis of 132 observed events from the KTeV experiment.
- Estimation of 0.8 background events.
- Application of the D'Ambrosio-Isidori-Portolès (DIP) model.
Main Results:
- Branching ratio determined to be [2.69+/-0.24(stat)+/-0.12(syst)]x10(-9).
- First measurement of DIP parameter alpha: -1.59+/-0.37.
- No sensitivity to DIP parameter beta due to limited statistics.
Conclusions:
- The measured branching ratio and alpha parameter are consistent with theoretical expectations.
- The K(L)-->e+ e- mu+ mu- decay mode offers potential for constraining CP and lepton violation.