Pion Content of the Nucleon as seen in the NA51 Drell-Yan experiment

Abstract

In a recent CERN Drell-Yan experiment the NA51 group found a strong asymmetry of $\bar{u}$ and $\bar{d}$ densities in the proton at $x\simeq 0.18$. We interpret this result as a decisive confirmation of the pion-induced sea in the nucleon.

Comments: 10 pages + 3 figures, Preprint KFA-IKP(TH)-1994-14 .tex file. After \enddocument a uu-encodeded Postscript file comprising the figures is appended