Two-pion production processes, chiral symmetry and NN interaction in the medium

We study the many-body effects in the propagation of the scalar meson in the nuclear medium arising from its coupling to two pion states. We identify the source of the medium effects as the influence of the individual nucleon response arising from their pion clouds. The same modification applies to...

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Detalles Bibliográficos
Autores principales: Chanfray, G., Davesne, D., Ericson, M., Martini, M.
Lenguaje:eng
Publicado: 2004
Materias:
Nuclear Physics - Theory
Acceso en línea:https://dx.doi.org/10.1140/epja/i2005-10245-5
http://cds.cern.ch/record/738908
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author Chanfray, G.
Davesne, D.
Ericson, M.
Martini, M.
author_facet Chanfray, G.
Davesne, D.
Ericson, M.
Martini, M.
author_sort Chanfray, G.
collection CERN
description We study the many-body effects in the propagation of the scalar meson in the nuclear medium arising from its coupling to two pion states. We identify the source of the medium effects as the influence of the individual nucleon response arising from their pion clouds. The same modification applies to the QCD scalar susceptibility. It reflects the reshaping of the scalar strength observed in $2\pi$ production experiments. While large modifications of the $\sigma $ propagator occur, we show that the NN scalar potential remains instead unaffected.
id cern-738908
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2004
record_format invenio
spelling cern-7389082023-03-14T20:26:11Zdoi:10.1140/epja/i2005-10245-5http://cds.cern.ch/record/738908engChanfray, G.Davesne, D.Ericson, M.Martini, M.Two-pion production processes, chiral symmetry and NN interaction in the mediumNuclear Physics - TheoryWe study the many-body effects in the propagation of the scalar meson in the nuclear medium arising from its coupling to two pion states. We identify the source of the medium effects as the influence of the individual nucleon response arising from their pion clouds. The same modification applies to the QCD scalar susceptibility. It reflects the reshaping of the scalar strength observed in $2\pi$ production experiments. While large modifications of the $\sigma $ propagator occur, we show that the NN scalar potential remains instead unaffected.We study the two-pion propagator in the nuclear medium. This quantity appears in the $\pi-\pi$ T-matrix and we show that it also enters the QCD scalar susceptibility. The medium effects on this propagator are due to the influence of the individual nucleon response to a scalar field through their pion clouds. This response is appreciably increased by the nuclear environment. It produces an important convergence effect between the scalar and pseudoscalar susceptibilities, reflecting the reshaping of the scalar strengh observed in $2\pi$ production experiments. While a large modification of the $\sigma$ propagator follows, due to its coupling to two pion states, we show that the NN potential remains instead unaffected.nucl-th/0406003LYCEN-2004-08LYCEN-2004-08oai:cds.cern.ch:7389082004-06-01
spellingShingle Nuclear Physics - Theory
Chanfray, G.
Davesne, D.
Ericson, M.
Martini, M.
Two-pion production processes, chiral symmetry and NN interaction in the medium
title Two-pion production processes, chiral symmetry and NN interaction in the medium
title_full Two-pion production processes, chiral symmetry and NN interaction in the medium
title_fullStr Two-pion production processes, chiral symmetry and NN interaction in the medium
title_full_unstemmed Two-pion production processes, chiral symmetry and NN interaction in the medium
title_short Two-pion production processes, chiral symmetry and NN interaction in the medium
title_sort two-pion production processes, chiral symmetry and nn interaction in the medium
topic Nuclear Physics - Theory
url https://dx.doi.org/10.1140/epja/i2005-10245-5
http://cds.cern.ch/record/738908
work_keys_str_mv AT chanfrayg twopionproductionprocesseschiralsymmetryandnninteractioninthemedium
AT davesned twopionproductionprocesseschiralsymmetryandnninteractioninthemedium
AT ericsonm twopionproductionprocesseschiralsymmetryandnninteractioninthemedium
AT martinim twopionproductionprocesseschiralsymmetryandnninteractioninthemedium

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