A test of the Delta S = Delta Q selection rule in K°e3 decay
Mantsch, Paul Matthew
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https://hdl.handle.net/2142/25853
Description
Title
A test of the Delta S = Delta Q selection rule in K°e3 decay
Author(s)
Mantsch, Paul Matthew
Issue Date
1970
Doctoral Committee Chair(s)
Smith, J.H.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Argonne ZGS
weak interaction selection rule
heavy plate spark chambers
Language
en
Abstract
An experiment was performed at the Argonne ZGS to test the
validity of the 6S = t:P. weak interaction selection rule for the decay
KAn experiment was performed at the Argonne ZGS to test the
validity of the 6S = t:P. weak interaction selection rule for the decay
[equation] K mesons were produced by a 3 GeV beam on a
carbon target in the reaction [equation]. Even t were reconstructed
on the basis of the trajectories of the kaon decay products
in optical spark chambers located ina magnetic field. The electron
from the decay was identified by its shower in heavy plate spark chambers.
The presence of the associated AO
was deduced from its decay AO ~~ + p
in spark chambers near the target. Decay times for the KO,s were
measured over a proper time interval of .5 to 6.5 K~lifetimes from
production. Decay time distributions for both signs of the decay lepton
were corrected for geometrical efficiency and fit to theoretical distributions.
The complex quantity x, determined from the fit, measured the
magni tude and phase of the ratio of 6S = - 6Q to 6S = 6Q decay amplitudes.
A non-zero magnitude for x would imply a violation of the 6S = 6Qrule,
whereas an imaginary part for x would reveal a violation of T and hence
----~---~----------
CP invariance. The results of our experiment based on 342 events are:
Re x= -.05 ± .12 Im x = -.13 ± .11
These results are completely consistent with no violation of the
68 = 6Q rule or of T invariance. K mesons 'were produced by a 3 GeV ~ beam on a
carbon target ~'nh t e react '~ on ~ +p ~ A0 + K0 . Even t were constructed
on the basis of the trajectories of the kaon decay products
in optical spark chambers located in a magnetic field. The electron
from the decay was identified by its shower in heavy plate spark chambers.
The presence of the associated AO
was deduced from its decay AO -> + p
in spark chambers near the target. Decay times for the KO,s were
measured over a proper time interval of .5 to 6.5 K lifetimes from
production. Decay time distributions for both signs of the decay lepton
were corrected for geometrical efficiency and fit to theoretical distributions.
The complex quantity x, determined from the fit, measured the
magnitude and phase of the ratio of 6S = - 6Q to 6S = 6Q decay amplitudes.
A non-zero magnitude for x would imply a violation of the 6S = 6Qrule,
whereas an imaginary part for x would reveal a violation of T and hence
CP invariance. The results of our experiment based on 342 events are:
Re x= -.05 ± .12 Im x = -.13 ± .11
These results are completely consistent with no violation of the
68 = 6Q rule or of T invariance.
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