What question did this study set out to answer?

This research aims to measure the branching ratio of the decay K S → π ± e ∓ ν ( ν ).

March 5, 2026Open Access

Measurement of the branching fraction for the decay

Puntos clave

This research aims to measure the branching ratio of the decay K S → π ± e ∓ ν ( ν ).
Utilized the KLOE detector to analyze K S -mesons.
Produced K S -mesons through the reaction e + e − → φ → K S K L.
Analyzed approximately 5 × 10 6 K S -tagged events to identify semileptonic decays.
Observed 624 ± 30 semileptonic K S decays in the data sample.
Calculated the branching ratio as BR(K S → πeν)=(6.91 ± 0.37) × 10 − 4.
Findings align with the Standard Model expectations for the decay.

Resumen

We present a measurement of the branching ratio BR(K → π ± e ∓ ̄ ν ( ν )) performed using the KLOE detector. K S -mesons are produced in the reaction e + e − → φ → K S K L at the DA Φ NE collider. In a sample of ∼ 5 × 10 6 K S -tagged events we find 624 ± 30 semileptonic K S decays.Normalizing to the K S → π + π − count in the same data sample, we obtain BR( K S → πeν )=(6 . 91 ± 0 . 37) × 10 − 4 , in agreement with the Standard Model expectation.

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