In an experiment with 360 GeV/cπ− beam at the CERN SPS using the high resolution hydrogen bubble chamber LEBC and the European Hybrid Spectrometer, an event has been observed of the type π−p→D0D0 + 8 prongs. The fully reconstructed decay modes are D0→K−π+π0π0andD0→K+π+π−π− , with all six charged tracks being detected in the spectrometer and all four photons from the π0 decays detected in the lead glass gamma detection system. The D0 has momentum 119.0 ± 0.6 GeV/c, xF = 0.31, length 4.1 ± 0.1 mm and proper lifetime (2.1 ± 0.1) × 10−13 s. The D0 has momentum 78.5 ± 0.3 GeV/c, xF = 0.19, length 7.5 ± 0.1 mm and proper lifetime (5.9 ± 0.1) × 10−13 s.
Observation of a fully reconstructed D0D0 pair with long proper lifetimes in a high resolution hydrogen bubble chamber and the European hybrid spectrometer
MENICHETTI, Ezio;
1981-01-01
Abstract
In an experiment with 360 GeV/cπ− beam at the CERN SPS using the high resolution hydrogen bubble chamber LEBC and the European Hybrid Spectrometer, an event has been observed of the type π−p→D0D0 + 8 prongs. The fully reconstructed decay modes are D0→K−π+π0π0andD0→K+π+π−π− , with all six charged tracks being detected in the spectrometer and all four photons from the π0 decays detected in the lead glass gamma detection system. The D0 has momentum 119.0 ± 0.6 GeV/c, xF = 0.31, length 4.1 ± 0.1 mm and proper lifetime (2.1 ± 0.1) × 10−13 s. The D0 has momentum 78.5 ± 0.3 GeV/c, xF = 0.19, length 7.5 ± 0.1 mm and proper lifetime (5.9 ± 0.1) × 10−13 s.
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