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A Monte Carlo study of Pion Beta Decay in the RMC spectrometer Veillette, Sacha
Abstract
Through Monte Carlo simulation, this thesis assesses the efficiency, strengths and weaknesses of the TRIUMF Radiative Muon Capture pair-spectrometer for the purpose of performing a measurement of Pion Beta Decay. We discuss the importance of Pion Beta Decay in terms of current theories of particle physics, with a special emphasis on the Standard Model. Properties of this weak process are described and some past and ongoing experimental efforts are briefly reviewed. The actual Radiative Muon Capture facility is described since on its configuration, the signatures of the relevant processes, the Pion Beta Decay signal and the experimental backgrounds. The detailed manner by which the respective rates have to be evaluated is also explained. We concentrate on the work done to obtain a realistic simulation for processes with branching ratios of the order 10- 8 or less. The basic Monte Carlo software used, CERN's GEANT 3 program, is introduced before the major modifications made to the package are described in detail. The optimal analysis scheme for the present detector is assessed by studying a variety of energy and geometry cuts on the Monte Carlo data. The expected experimental rates are obtained from a complete analysis by combining various cuts. We discuss the results in terms of the present experimental setup. Some possible modifications to the RMC pair-spectrometer are discussed based on the simulated properties of Pion Beta Decay. Other possible modifications as well as alternative detector designs are also discussed briefly. This study shows that, due to an overall low acceptance for two-photon events, the present detector is not suitable for a Pion Beta Decay measurement. However, because of its unique features for the reconstruction of photons from e+e- conversion pairs, the spectrometer does present great advantages for background reduction for a Pion Beta Decay signal if a factor of 10 increase in the pion flux (π+) could be obtained.
Item Metadata
| Title |
A Monte Carlo study of Pion Beta Decay in the RMC spectrometer
|
| Creator | |
| Publisher |
University of British Columbia
|
| Date Issued |
1992
|
| Description |
Through Monte Carlo simulation, this thesis assesses the efficiency, strengths and weaknesses
of the TRIUMF Radiative Muon Capture pair-spectrometer for the purpose of
performing a measurement of Pion Beta Decay.
We discuss the importance of Pion Beta Decay in terms of current theories of particle
physics, with a special emphasis on the Standard Model. Properties of this weak process
are described and some past and ongoing experimental efforts are briefly reviewed.
The actual Radiative Muon Capture facility is described since on its configuration,
the signatures of the relevant processes, the Pion Beta Decay signal and the experimental
backgrounds. The detailed manner by which the respective rates have to be evaluated is
also explained.
We concentrate on the work done to obtain a realistic simulation for processes with
branching ratios of the order 10- 8 or less. The basic Monte Carlo software used, CERN's
GEANT 3 program, is introduced before the major modifications made to the package
are described in detail.
The optimal analysis scheme for the present detector is assessed by studying a variety
of energy and geometry cuts on the Monte Carlo data. The expected experimental rates
are obtained from a complete analysis by combining various cuts.
We discuss the results in terms of the present experimental setup. Some possible
modifications to the RMC pair-spectrometer are discussed based on the simulated properties
of Pion Beta Decay. Other possible modifications as well as alternative detector
designs are also discussed briefly.
This study shows that, due to an overall low acceptance for two-photon events, the
present detector is not suitable for a Pion Beta Decay measurement. However, because
of its unique features for the reconstruction of photons from e+e- conversion pairs, the
spectrometer does present great advantages for background reduction for a Pion Beta
Decay signal if a factor of 10 increase in the pion flux (π+) could be obtained.
|
| Extent |
2079254 bytes
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| Genre | |
| Type | |
| File Format |
application/pdf
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| Language |
eng
|
| Date Available |
2008-12-18
|
| Provider |
Vancouver : University of British Columbia Library
|
| Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
|
| DOI |
10.14288/1.0086611
|
| URI | |
| Degree | |
| Program | |
| Affiliation | |
| Degree Grantor |
University of British Columbia
|
| Graduation Date |
1992-11
|
| Campus | |
| Scholarly Level |
Graduate
|
| Aggregated Source Repository |
DSpace
|
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Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.