Probing strongly interacting matter with heavy resonances in Pb+Pb collisions at LHC energies

Abstract

With the recent Pb+Pb collisions experiments at LHC, a new era has began in the field of heavy ion collisions. The heavy hadronic resonances such as J/ψ, Υ and their states are produced in plenty at LHC and can be tackled in perturbative QCD. These resonances along with other low mass resonances can be very well reconstructed with advanced detector technologies and are used to study the detailed tomography of the matter which would not have been possible at lower energies. In addition to the hot matter effects one also has to address the questions such as modification of parton distributions of protons when placed inside a nucleus. This is known as initial state effect and can be well addressed at LHC by measuring the Z boson. In addition, there are (cold) nuclear matter effects which can modify the probes and are planned to be studied in future p+Pb collisions. In this paper, we review the recent LHC results with emphasis on quarkonia. We devote a section on modeling of quarkonia suppression. The new calculation done in the case of Υ and its states are given.