Quarkonia production with the HERA-B experiment

Abstract

Measurements of the dependence of the J/ψ production cross section on its kinematic variables as well as on the target atomic numbers for 920 GeV/c protons incident on different targets have been made with the HERA-B detector. The large collected di-lepton sample allows us to study the production ratio of ψ(2S) to J/ψ and of χc to J/ψ. We also report on measurements of the and ϒ production cross section.