Production cross section of $Z^{0}$ bosons in pp collisions at $\sqrt{s}=$ 13 {\TeV} within the acceptance of the ALICE central barrel, compared with POWHEG calculations  performed with the CT14NNLO , NNPDF40  and CT18NLO  PDF sets. Statistical and systematic uncertainties of the measurement are shown as a vertical line and an open box, respectively.