ϒ(nS) Production in p  + Pb Collisions at 5.02 TeV with ATLAS

The suppression of production rates of heavy quarkonia in ion-ion collisions with respect to nucleon-nucleon collisions provide sensitive probes in studying the properties of the hot and dense matter formed in these collisions at high energies. However, the baseline for understanding the behavior in the hot medium should be determined from nucleon-nucleus collisions. The nucleon-nucleus collisions themselves are also important for studying the nature of modifications of the parton distributions in the nucleus. Based on the data collected by the ATLAS detector in 2013 at the LHC, we show the results of ϒ(nS) production in proton-lead collisions at sNN=5.02 TeV . The measurements of ϒ(nS) production cross section, nuclear modification factors, excited-to-ground state ratios and self-normalized ratios are presented for the di-muon decay channel differentially as a function of p T , center-of-mass rapidity and event centrality.