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Weak radiative hyperon decays in chiral perturbation theory
The parity-conserving $a$ and parity-violating $b$ amplitudes for weak radiative hyperon decay are studied using chiral perturbation theory. The imaginary parts of $a$ and $b$ are computed using unitarity. The real part of $b$ is dominated by a one-loop infrared divergent graph which is computed. Th...
Autores principales: | , , , |
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Lenguaje: | eng |
Publicado: |
1993
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1016/0550-3213(93)90336-N http://cds.cern.ch/record/242399 |
_version_ | 1780885050827472896 |
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author | Jenkins, Elizabeth Ellen Luke, Michael E. Manohar, Aneesh V. Savage, Martin J. |
author_facet | Jenkins, Elizabeth Ellen Luke, Michael E. Manohar, Aneesh V. Savage, Martin J. |
author_sort | Jenkins, Elizabeth Ellen |
collection | CERN |
description | The parity-conserving $a$ and parity-violating $b$ amplitudes for weak radiative hyperon decay are studied using chiral perturbation theory. The imaginary parts of $a$ and $b$ are computed using unitarity. The real part of $b$ is dominated by a one-loop infrared divergent graph which is computed. The real part of $a$ has a large theoretical uncertainty and cannot be calculated reliably. Counterterms for the $a$ and $b$ amplitudes are classified using $CPS$ symmetry. The experimental values for decay widths and asymmetries are consistent with theory, with the exception of the asymmetry parameter for the $\Sigma^+ \rightarrow p \gamma$ decay. |
id | cern-242399 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 1993 |
record_format | invenio |
spelling | cern-2423992020-07-23T02:46:04Zdoi:10.1016/0550-3213(93)90336-Nhttp://cds.cern.ch/record/242399engJenkins, Elizabeth EllenLuke, Michael E.Manohar, Aneesh V.Savage, Martin J.Weak radiative hyperon decays in chiral perturbation theoryParticle Physics - TheoryThe parity-conserving $a$ and parity-violating $b$ amplitudes for weak radiative hyperon decay are studied using chiral perturbation theory. The imaginary parts of $a$ and $b$ are computed using unitarity. The real part of $b$ is dominated by a one-loop infrared divergent graph which is computed. The real part of $a$ has a large theoretical uncertainty and cannot be calculated reliably. Counterterms for the $a$ and $b$ amplitudes are classified using $CPS$ symmetry. The experimental values for decay widths and asymmetries are consistent with theory, with the exception of the asymmetry parameter for the $\Sigma^+ \rightarrow p \gamma$ decay.The parity-conserving $a$ and parity-violating $b$ amplitudes for weak radiative hyperon decay are studied using chiral perturbation theory. The imaginary parts of $a$ and $b$ are computed using unitarity. The real part of $b$ is dominated by a one-loop infrared divergent graph which is computed. The real part of $a$ has a large theoretical uncertainty and cannot be calculated reliably. Counterterms for the $a$ and $b$ amplitudes are classified using $CPS$ symmetry. The experimental values for decay widths and asymmetries are consistent with theory, with the exception of the asymmetry parameter for the $\Sigma^+ \rightarrow p \gamma$ decay.The parity-conserving a and parity-violating b amplitudes for weak radiative hyperon decay are studied using chiral perturbation theory. The imaginary parts of a and b are computed using unitarity. The real part of b is dominated by a one-loop infrared divergent graph which is computed. The real part of a has a large theoretical uncertainty and cannot be calculated reliably. Counterterms for the a and b amplitudes are classified using CPS symmetry. The experimental values for decay widths and asymmetries are consistent with theory, with the exception of the asymmetry parameter for the Σ + → p γ decay.hep-ph/9210265CERN-TH-6690-92UCSD-PTH-92-33CERN-TH-6690-92UCSD-PTH-92-33oai:cds.cern.ch:2423991993 |
spellingShingle | Particle Physics - Theory Jenkins, Elizabeth Ellen Luke, Michael E. Manohar, Aneesh V. Savage, Martin J. Weak radiative hyperon decays in chiral perturbation theory |
title | Weak radiative hyperon decays in chiral perturbation theory |
title_full | Weak radiative hyperon decays in chiral perturbation theory |
title_fullStr | Weak radiative hyperon decays in chiral perturbation theory |
title_full_unstemmed | Weak radiative hyperon decays in chiral perturbation theory |
title_short | Weak radiative hyperon decays in chiral perturbation theory |
title_sort | weak radiative hyperon decays in chiral perturbation theory |
topic | Particle Physics - Theory |
url | https://dx.doi.org/10.1016/0550-3213(93)90336-N http://cds.cern.ch/record/242399 |
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