$Z$ Boson Production in pp Collisions at $\sqrt{s}$ = 5.02 TeV with the ATLAS detector at the LHC

The production of $Z$ bosons in the di-muon decay channel in $pp$ collisions at $\sqrt{s}$ = 5.02 TeV is measured with the ATLAS detector. Data from the 2015 LHC run corresponding to a total integrated luminosity of 24.7 pb$^{-1}$ are used. Integrated fiducial cross section is measured to be $\sigma_{Z}^{\textrm{fid.}}$ = 590 $\pm$ 9(stat.)$\pm$ 12(syst.)$\pm$ 32(lumi.) pb. The results from $pp$ collisions are compared to the previously measured data in the proton-lead collisions system at the same energy. Results of the measurement are also compared to theoretical predictions based on NNLO and NLO QCD calculations. Information on the nuclear modification factor $R_{p\textrm{Pb}}$, for $Z$ bosons in proton-lead collisions is extracted from the comparison.