# Measurement of the forward Z boson production cross-section in pp collisions at $\sqrt{s} = 13$ TeV

A measurement of the production cross-section of Z bosons in pp collisions at $\sqrt{s}=13$ TeV is presented using dimuon and dielectron final states in LHCb data. The cross-section is measured for leptons with pseudorapidities in the range 2.0 <η <4.5, transverse momenta p$_{T}$ > 20 GeV and dilepton invariant mass in the range 60 <m(ℓℓ) <120 GeV. The integrated cross-section from averaging the two final states is σ$_{Z}^{ℓℓ}$  = 194.3 ± 0.9 ± 3.3 ± 7.6 pb, where the first uncertainty is statistical, the second is due to systematic effects, and the third is due to the luminosity determination. In addition, differential cross-sections are measured as functions of the Z boson rapidity, transverse momentum and the angular variable ϕ$_{η}^{*}$ .
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