On Electron-Positron Annihilation into Nucleon-Antinucleon Pairs

We discuss the puzzling experimental results on baryon-antibaryon production in e+e- annihilation close to the threshold, in particular the fact that sigma(e+e- --> nbar n) >~ sigma(e+e- --> pbar p). We discuss an interpretation in terms of a two-step process, via an intermediate coherent i...

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Detalles Bibliográficos
Autores principales: Ellis, John R., Karliner, Marek
Lenguaje:eng
Publicado: 2001
Materias:
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1088/1367-2630/4/1/318
http://cds.cern.ch/record/515623
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author Ellis, John R.
Karliner, Marek
author_facet Ellis, John R.
Karliner, Marek
author_sort Ellis, John R.
collection CERN
description We discuss the puzzling experimental results on baryon-antibaryon production in e+e- annihilation close to the threshold, in particular the fact that sigma(e+e- --> nbar n) >~ sigma(e+e- --> pbar p). We discuss an interpretation in terms of a two-step process, via an intermediate coherent isovector state serving as an intermediary between e+e- and the baryon-antibaryon system. We provide evidence that the isovector channel dominates both e+e- --> pions and from Nbar N annihilation at rest, and show that the observed ratio of sigma(e+e- --> nbar n)/sigma(e+e- --> pbarp p) can be understood quantitatively in this picture.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2001
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spelling cern-5156232023-03-14T20:05:35Zdoi:10.1088/1367-2630/4/1/318http://cds.cern.ch/record/515623engEllis, John R.Karliner, MarekOn Electron-Positron Annihilation into Nucleon-Antinucleon PairsParticle Physics - PhenomenologyWe discuss the puzzling experimental results on baryon-antibaryon production in e+e- annihilation close to the threshold, in particular the fact that sigma(e+e- --> nbar n) >~ sigma(e+e- --> pbar p). We discuss an interpretation in terms of a two-step process, via an intermediate coherent isovector state serving as an intermediary between e+e- and the baryon-antibaryon system. We provide evidence that the isovector channel dominates both e+e- --> pions and from Nbar N annihilation at rest, and show that the observed ratio of sigma(e+e- --> nbar n)/sigma(e+e- --> pbarp p) can be understood quantitatively in this picture.We discuss the puzzling experimental results on baryon-antibaryon production in e+e- annihilation close to the threshold, in particular the fact that sigma(e+e- --> nbar n) >~ sigma(e+e- --> pbar p). We discuss an interpretation in terms of a two-step process, via an intermediate coherent isovector state serving as an intermediary between e+e- and the baryon-antibaryon system. We provide evidence that the isovector channel dominates both e+e- --> pions and from Nbar N annihilation at rest, and show that the observed ratio of sigma(e+e- --> nbar n)/sigma(e+e- --> pbarp p) can be understood quantitatively in this picture.hep-ph/0108259CERN-TH-2001-234TAUP-2678-01CERN-TH-2001-234TAUP-2678oai:cds.cern.ch:5156232001-08-30
spellingShingle Particle Physics - Phenomenology
Ellis, John R.
Karliner, Marek
On Electron-Positron Annihilation into Nucleon-Antinucleon Pairs
title On Electron-Positron Annihilation into Nucleon-Antinucleon Pairs
title_full On Electron-Positron Annihilation into Nucleon-Antinucleon Pairs
title_fullStr On Electron-Positron Annihilation into Nucleon-Antinucleon Pairs
title_full_unstemmed On Electron-Positron Annihilation into Nucleon-Antinucleon Pairs
title_short On Electron-Positron Annihilation into Nucleon-Antinucleon Pairs
title_sort on electron-positron annihilation into nucleon-antinucleon pairs
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1088/1367-2630/4/1/318
http://cds.cern.ch/record/515623
work_keys_str_mv AT ellisjohnr onelectronpositronannihilationintonucleonantinucleonpairs
AT karlinermarek onelectronpositronannihilationintonucleonantinucleonpairs

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