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

  • G. Chanfray
  • D. Davesne
  • M. Ericson
  • M. MartiniEmail author
Hadron Physics

Abstract.

We study the two-pion propagator in the nuclear medium. This quantity appears in the ππ 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 strength observed in 2π production experiments. While a large modifications of the σ propagator follows, due to its coupling to two pion states, we show that the NN potential remains instead unaffected.

PACS.

11.30.Rd Chiral symmetries 12.40.Yx Hadron mass models and calculations 13.75.Cs Nucleon-nucleon interactions (including antinucleons, deuterons, etc.) 21.30.-x Nuclear forces 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2006

Authors and Affiliations

  • G. Chanfray
    • 1
  • D. Davesne
    • 1
  • M. Ericson
    • 1
    • 2
  • M. Martini
    • 1
    Email author
  1. 1.IPN Lyon, IN2P3-CNRS and UCB Lyon IVilleurbanne CedexFrance
  2. 2.Theory Division, Physics DepartmentCERNGenevaSwitzerland

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