2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/41373We discuss a program for systematic studies of heavy quark production in $pp$, $pA$ and $AA$ interactions. The $Q \bar Q$ production cross sections themselves cannot be accurately predicted to better than 50% at RHIC. For studies of deviations in $Q \bar Q$ production such as those by nuclear shadowing and heavy quark energy loss, the $pp$ cross section thus needs to be measured. We then show that the ratio of $pA$ to $pp$ dilepton mass distributions can provide a measurement of the nuclear gluon distribution. With total rates and nuclear shadowing under control it is easier to study energy loss and to use $c \bar c$ as a normalization of $J/ψ$ production.10 pages, uses special included style file, 4 eps figures, for proceedings of the 18th Winter Workshop on Nuclear Dynamics, Jan. 2002High Energy Physics - Phenomenologytext