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High Energy Physics Seminars
| High Energy
Wednesday, March 8, 2000
Physics Building, Room 204
Note special time.
Professor Konrad Kleinknecht
[Host: Brad Cox]
Johannes Gutenberg University, Mainz, Germany
"Recent Results from the NA48 Kaon Decay Experiment at CERN"
The origin of the violation of CP (particle-antiparticle) symmetry in
decays of neutral K mesons has been unclear for a long time after its
discovery. The question is whether this violation is due to a new superweak
interaction or to a small part of the well-known weak interaction.
An experiment at CERN in 1988 (NA31) indicated that epsilon', the parameter
that distinguishes between the two possibilities, is different from
zero, thus pointing to the latter possibility, while an experiment at FNAL
found a result consistent with zero. NA48 has measured the parameter
epsilon'/epsilon of direct CP violation and confirms the earlier observation
of NA31. Results will be given, as well as some results on rare Kaon decays.
Postcript: This result was announced for the first time on March 7th
at CERN. This will be the first North American discussion
of this crucial measurement which points to the origin of CP
(time reversal) violation.
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