Pions in isospin asymmetric matter and nuclear Drell-Yan scattering |
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Institution: | 1. Department of Theoretical Physics, Janus Pannonius University, Ifjusag u. 6, 7624 Pecs, Hungary;2. Kernfysisch Versneller Instituut, Zernikelaan 25, NL-9747AA Groningen, The Netherlands |
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Abstract: | Using a self-consistent delta-hole model the pion propagation in isospin asymmetric nuclear matter is studied. In neutron-rich matter, corresponding to heavy nuclei, a significant difference in positive and negative pion light-cone distributions is obtained leading to a nuclear enhancement of up antiquark distribution compared to the down antiquark one. This means that the sea-quark asymmetry in the free nucleon cannot be extracted model independently from an experiment on a neutron-rich nucleus. |
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