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

The LHCb collaboration
Aaij, Roel , Adeva, Bernardo , Adinolfi, Marco , Ajaltouni, Ziad , Akar, Simon , Albrecht, Johannes , Alessio, Federico , Alexander, Michael , Ali, Suvayu , Alkhazov, Georgy
JHEP 09 (2016) 136, 2016.

Abstract
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 $2.0 < \eta < 4.5$, transverse momenta $p_\text{T} > 20$ GeV and dilepton invariant mass in the range $60<m(\ell\ell)<120$ GeV. The integrated cross-section from averaging the two final states is \begin{equation*}\sigma_{\text{Z}}^{\ell\ell} = 194.3 \pm 0.9 \pm 3.3 \pm 7.6\text{ pb,}\end{equation*} 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 $\phi^*_\eta$.

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