83 research outputs found
Test of CPT Symmetry and Quantum Mechanics with Experimental data from CPLEAR
We use fits to recent published CPLEAR data on neutral kaon decays to
and to constrain the CPT--violation parameters
appearing in a formulation of the neutral kaon system as an open
quantum-mechanical system. The obtained upper limits of the CPT--violation
parameters are approaching the range suggested by certain ideas concerning
quantum gravity.Comment: 9 pages of uuencoded postscript (includes 3 figures
Physics at CPLEAR
LEAR offered unique opportunities to study the symmetries which exist between matter and antimatter. At variance with other approaches at this facility, CPLEAR was an experiment devoted to the study of , and symmetries in the neutral-kaon system. A variety of measurements allowed us to determine with high precision the parameters which describe the time evolution of the neutral kaons and their antiparticles, including decay amplitudes, and the related symmetry properties. Limits concerning quantum-mechanical predictions (EPR, coherence of the wave function) or the equivalence principle of general relativity have been obtained. An account of the main features of the experiment and its performances is given here, together with the results achieved.http://www.sciencedirect.com/science/article/B6TVP-47F7DN6-2/1/21e8338e47f0a67bf401b4882a11cee
THE CPLEAR PARTICLE IDENTIFICATION DETECTOR
The CPLEAR experiment will measure CP violation parameters in the
neutral kaon system, using a low energy antiproton beam from the Low
Energy Antiproton Ring (LEAR) at CERN. One of its subdetectors, the
Particle Identification Detector (PID), makes a fast separation of pions
and kaons, which is essential for the experiment. This article describes
the design of the PID and its performance during beam tests and during
initial runs at LEAR. A pion rejection efficiency of 99.7% for the
first level trigger (after 60 ns) is found in the relevant momentum
region
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