Cargando…

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...

Descripción completa

Detalles Bibliográficos
Autores principales: Jenkins, Elizabeth Ellen, Luke, Michael E., Manohar, Aneesh V., Savage, Martin J.
Lenguaje:eng
Publicado: 1993
Materias:
Acceso en línea:https://dx.doi.org/10.1016/0550-3213(93)90336-N
http://cds.cern.ch/record/242399
_version_ 1780885050827472896
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
work_keys_str_mv AT jenkinselizabethellen weakradiativehyperondecaysinchiralperturbationtheory
AT lukemichaele weakradiativehyperondecaysinchiralperturbationtheory
AT manoharaneeshv weakradiativehyperondecaysinchiralperturbationtheory
AT savagemartinj weakradiativehyperondecaysinchiralperturbationtheory