Physics at CPLEAR Angelopoulos, A.; Apostolakis, A.; Aslanides, E. ...
Physics reports,
2003, 2003-1-00, Volume:
374, Issue:
3
Journal Article
Peer reviewed
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
CP
,
T
and
CPT
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.
The CPT-violation parameters Re( δ ) and Im( δ ) determined recently by CPLEAR are used to evaluate the K 0 –<img src="http://ars.els-cdn.com/content/image/1-s2.0-S0370269399013337-si10.gif" ...data-loaded="true" data-inlimgeid="1-s2.0-S0370269399013337-si10.gif" /> mass and decay-width differences, as given by the difference between the diagonal elements of the neutral-kaon mixing matrix (M−i Γ /2). The results – <img src="http://ars.els-cdn.com/content/image/1-s2.0-S0370269399013337-si11.gif" data-loaded="true" data-inlimgeid="1-s2.0-S0370269399013337-si11.gif" /> GeV and <img src="http://ars.els-cdn.com/content/image/1-s2.0-S0370269399013337-si12.gif" data-loaded="true" data-inlimgeid="1-s2.0-S0370269399013337-si12.gif" /> GeV – are consistent with CPT invariance. The CPT invariance is also shown to hold within a few times 10 −3 –10 −4 for many of the amplitudes describing neutral-kaon decays to different final states.
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