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The partonic flux originated from a heavy nucleus is not the mere sum of thefluxes coming from the individual nucleons. There are various effects that giverise to modifications. One of these effects is here investigated i.e. thepresence of a cloud of virtual pions co-moving with the nucleus. It is foundthat the contribution of these virtual particles to the total parton fluxshould be rather small even if one includes the contribution of resonances.

Parton fluxes and virtual pions in heavy nuclei