CERN-NA-031()
Measurement of the Ratio $\eta_{00}^2$ to $\eta_{+-}^2$
()
- Proposed: Dec 22, 1981,
- Approved: Sep 16, 1982,
- Started: Nov 19, 1987,
- Completed: Dec 1, 1989
The aim of this experiment is an accurate determination of the ratio of neutral to charged two pion decays of KL and KS mesons: R=|η_00|^2/|η_+−|^2=Γ(KL→2π^0 )/Γ(KS→2π^0):Γ(KL→π+π−)/Γ(KS→π+π−).In the superweak model of CP violation this ratio is equal to one exactly. Sizeable deviations from unity are predicted in popular models of the weak and electromagnetic interaction among six quarks. The two decay modes K^0→2π^0 and K0→π+π− are measured simultaneously, and alternately in KL and KS beams. The detector consists of an evacuated decay region; proportional wire chambers to measure the charged pion directions; a liquid argon calorimeter with good energy and position resolution to measure the photons from π^0 decays; a hadron calorimeter to measure the energy of the charged pions; a plane of scintillation counters serving as muon identifier. It is intended to work in the 50—150 GeV K0 energy range, and to collect more than 10^5 useful KL→2π^0 decays.
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