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Two-loop contributions to the [Beta] - [|Beta] mixing amplitude Fortin, Simon
Abstract
It is known that the Standard Model, being a spontaneously broken gauge theory, violates the decoupling theorem. In practice, this means that amplitudes for low-energy processes grow without limit as the mass of fermions or scalars is made large. As a result of the recent determination of a lower bound of 90 GeV on the mass of the top quark and the general expectation of a large mass for the Higgs boson, this effect could lead to large higher order corrections to the observables of the theory. In this spirit, we calculate the two-loop corrections to the [Beta] - [|Beta] mixing amplitude in the two limits of a very large top quark mass or a very large Higgs mass. Analytical expressions are obtained for the leading terms. The results are found to be much smaller than what one would naively expect.
Item Metadata
| Title |
Two-loop contributions to the [Beta] - [|Beta] mixing amplitude
|
| Creator | |
| Publisher |
University of British Columbia
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| Date Issued |
1991
|
| Description |
It is known that the Standard Model, being a spontaneously broken gauge theory, violates
the decoupling theorem. In practice, this means that amplitudes for low-energy processes
grow without limit as the mass of fermions or scalars is made large. As a result of the
recent determination of a lower bound of 90 GeV on the mass of the top quark and the
general expectation of a large mass for the Higgs boson, this effect could lead to large
higher order corrections to the observables of the theory. In this spirit, we calculate the
two-loop corrections to the [Beta] - [|Beta] mixing amplitude in the two limits of a very large
top quark mass or a very large Higgs mass. Analytical expressions are obtained for the
leading terms. The results are found to be much smaller than what one would naively
expect.
|
| Extent |
5088916 bytes
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| Genre | |
| Type | |
| File Format |
application/pdf
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| Language |
eng
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| Date Available |
2008-12-19
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| Provider |
Vancouver : University of British Columbia Library
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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.
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| DOI |
10.14288/1.0085642
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| URI | |
| Degree | |
| Program | |
| Affiliation | |
| Degree Grantor |
University of British Columbia
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| Graduation Date |
1992-05
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| Campus | |
| Scholarly Level |
Graduate
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| Aggregated Source Repository |
DSpace
|
Item Media
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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.