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

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*}σ_{\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 ${\varphi }_{\eta }^{\ast }$.

All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-021.html

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