JET PRODUCTION IN PROTON-ANTIPROTON COLLISIONS AND THE MESON CLOUD INTHE NUCLEON

We discuss some selected effects which may potentially be responsible for an enhancement of the large-E-T inclusive jet production with resp ect to the modern NLO analyses observed recently by the CDF Collaborat ion at Fermilab. We find that in addition to the modification of large -x gluon distribution also target mass corrections in lepton DIS and e ffect of the pion cloud in the nucleon may be essential for a proper u nderstanding of the experimental jet data. The meson cloud model which turned out to be successful in quantitative understanding of the Gott fried Sum Rule violation, SU(3) symmetry violation of the nucleon sea and the Drell-Yan asymmetry measured recently at CERN, produces also a sizable enhancement of the large-Er inclusive jet cross section. This enhancement is caused by a substantial enhancement over standard para metrizations of the nucleon sea quark distributions at intermediate an d large values of Bjorken-x parameter and/or a special structure of va lence quark distributions due to the meson cloud. (C) 1997 Elsevier Sc ience B.V.