Quarkonium feed down and sequential suppression

摘要: About 40--50 % of the quarkonium ground states $J/\ensuremath{\psi}(1S)$ and $\ensuremath{\Upsilon}(1S)$ produced in hadronic collisions originate from decay higher excitations. In a hot medium, these are dissociated at lower temperatures than more tightly bound states, leading to sequential suppression pattern. Using new finite temperature lattice results, we specify in-medium potential between heavy quarks determine dissociation points different states. On basis recent Collider Detector Fermilab (CDF) data on bottomonium production, then obtain first predictions for $\ensuremath{\Upsilon}$ nuclear collisions.