Inclusive Cross Section of J/Psi Particles in the Forward Direction in Proton-Antiproton Collisions at CDF ABSTRACT The first measurement of the inclusive cross section of the J/Psi particle in the forward detector at CDF is presented in this thesis. Events from the Fermilab collider Run 1B and Run 1C were selected which had two forward muons that satisfied certain quality cuts, and parent J/Psi's were reconstructed from the daughter muons. The efficiency and acceptance of the detector were then taken into account and the number of events turned into an inclusive cross section: sigma(J/Psi to mu + mu, pt > 10 GeV/c, 2.1<|eta|<2.6 ) = 167.8 +/- 14.2 pb Posted to /cdf/pub/thesis/cdf5338_steele_thesis.ps http://www-cdf.fnal.gov/thesis/cdf5338_steele_thesis.ps Posted by steele@fnald