An upper limit on the decay rate of K°L-> pi+ pi- gamma
Thatcher, Roy Cannon
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https://hdl.handle.net/2142/25732
Description
Title
An upper limit on the decay rate of K°L-> pi+ pi- gamma
Author(s)
Thatcher, Roy Cannon
Issue Date
1968
Doctoral Committee Chair(s)
Wattenberg, A.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
decay rate upper limit
spark chamber experiment
gamma ray conversion point
Language
en
Abstract
"In the film from a spark chamber, experiment on KL decays
performed in the 280 beam line of the ZGS at the Argonne National
Laboratory"" we undertook a search for the decay mode K°L-> pi+ pi- gamma
The charged decay products were momentum analyzed in a magnet and
identified in a set of range-shower chambers on the basis of their
behavior there. The position of the gamma ray conversion point in
these chambers was compared with the position predicted on the
hypothesis of K°L-> pi+ pi- gamma.
The Kpi3 provided almost the sole background as well: as
the normalization of our rate measurement. In 962 events with
good gamma showers we found one event fitted the 1(1(r hypothesis
within our spacial resolution. However, the expected background was one
event. This.,result corresponds to an upper limit on the decay rate
[reaction] sec -1 at a confidence level of 9O%.
The result is compared with the predictions of various theoretical
models. The possible connections to other decay processes [reaction] and the feasibilities of CP
invariance tests are discussed."
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