Pions in the nuclear medium and Drell-Yan scattering

Details Pions in the nuclear medium and Drell-Yan scattering Pions in the nuclear medium and Drell-Yan scattering

1997-03-12

arxiv.org/abs/nucl-th/9703025v1

Phys.Rev.C55:2665-2674,1997

Physics

Nuclear Physics

Nuclear Theory

33 pages, Latex with epsf, figures included, to appear in Phys. Rev. C

Scientific paper

10.1103/PhysRevC.55.2665

We investigate the modification of the pion-cloud in the nuclear medium and its effect on the nuclear Drell-Yan process. The pion's in-medium self-energy is calculated in a self-consistent delta-hole model, with particle-hole contribution also included. Both the imaginary and real part of the pion's and delta's self-energy are taken into account and related through a dispersion relation assuring causality. The resulting in-medium pion light-cone momentum distribution shows only a slight enhancement compared to the one of the free nucleon. As a consequence the ratio of the cross-section for Drell-Yan scattering on nuclear matter and nucleonic target is close to unity in agreement with experiment.

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