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Title:The total muon polarization in Kμ3° meson decay
Author(s):Abrams, Robert Jay
Doctoral Committee Chair(s):Wattenberg, A.
Department / Program:Physics
Subject(s):total muon polarization
Kμ3° meson decay
spark chamber experiment
Argonne national laboratory zero gradient synchrotron
form factor ratio
Abstract:A spark chamber experiment was performed at the Argonne National Laboratory Zero Gradient Synchrotron to study the polarization of the muon in the decay KL. The results of the test of time reversal in variance and the value obtained for the form factor ratio will be presented. o . . 0 KL mesons, from the 31 neutral beam, decayed in vacuum in a magnetic field. The momenta of the ~ and the ~ + particles were measured by me,ans of foil spark chambers inside the magnet. A kinematic reconstruction of the KLo decay was made for each event. In the 1602 events selected, the muon passed through a thick absorber, came to rest in a set of aluminum range spark chambers, and decayed ( ~ + ~ e + + v + -v). The muon polarization was determined from a study of the angular distribution of the decay positrons. Due to a two-fold ambiguity in the kinematic reconstruction, two methods were used to analyze the data. In the first method, unambiguous events were selected; after correcting for efficiencies, a least~squares analysis was performed on the positron angular distributions. The three orthogonal components of the muon polarization were obtained: where PL, PT' and Pp are, respectivelY9 the components of polarization along the muon momentum, transverse to the decay plane, and perpendicular to the muon (in the decay plane); a is the analyzing parameter of muon decay. In terms of the form factor ratio , the results were In the second method of analysis, a Monte Carlo calculation was made to simulate the decay of the KLO meson followed by the decay of the polarized muon. The kinematical ambiguity was treated such as to enable a direct comparison to.lbe made between the Monte Carlo sample and the actual data. }'The X2 analysis in terms of 5 was performed,with the following results The results of both method& yere consistent and in agreement with time reversal invariance, which predicts. The values obtained for Re ~ imply an energy dependence f6rtheform factors in K~3 decay.
Issue Date:1966
Genre:Dissertation / Thesis
Rights Information:1966 Robert Jay Abrams
Date Available in IDEALS:2011-05-20
Identifier in Online Catalog:61752101

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