Bonn 2001 – scientific programme

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T: Teilchenphysik

T 208: Seltene Zerf
älle 1

T 208.5: Talk

Tuesday, March 27, 2001, 15:00–15:15, HS XIII

Measurement of the semileptonic decay width of the K_S meson — •Cristina Morales — Institut für Physik, ETAP, Universität Mainz, 55099 Mainz

In contrast to the semileptonic decay of the long-lived neutral kaon, the decay K_S → π^±ł^∓ν_l has never been observed. The CPT theorem predicts a branching fraction of Br(K_S → π^±ł^∓ν_l) ≈ 6.7 × 10⁻⁴. During a 40-hour high intensity K_S run end of 1999 about 10¹⁰ K_S decays were produced. Using this data sample, a first measurement of the semileptonic decay width of the K_S meson is possible.