Dortmund 2006 – scientific programme

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T: Teilchenphysik

T 601: Seltene Zerf
älle

T 601.3: Talk

Friday, March 31, 2006, 11:45–12:00, HG2-HS2

Measurement of the decay K⁺→π⁺π⁻µ⁺ν — •Andrey Belkin and Burkhard Renk — Institut für Physik, Universität Mainz, 55099 Mainz

The NA48/2 experiment at CERN created great opportunities to analyze rare charged kaon decays. A large part of the 2003 year data was acquired with a newly introduced kaon sprectrometer. Along with magnet spectrometer, calorimeters and muon detector systems a precise reconstruction of kaon decays became possible. Particularly, the decay K⁺→π⁺π⁻µ⁺ν can be studied with calculable parameters of all particles, including the neutrino.

As a result, about 2500 events were selected. This sample is about 360 times larger than any previous result - and so, it brings a significant improvement in branching ratio evaluation. Relative small amount of background will possibly allow calculation of form-factors and of the π⁺π⁻ scattering length.