Measurement of forward $\mathrm{Z}\to {\mathrm{e}}^{+}{\mathrm{e}}^{-}$ production at $\sqrt{s}=8$TeV

Abstract

A measurement of the cross-section for Z-boson production in the forward region of pp collisions at 8TeV centre-of-mass energy is presented. The measurement is based on a sample of $\mathrm{Z}\to {\mathrm{e}}^{+}{\mathrm{e}}^{-}$ decays reconstructed using the LHCb detector, corresponding to an integrated luminosity of 2.0fb${}^{-1}$. The acceptance is defined by the requirements $2.0<\eta <4.5$ and $p_{\mathrm{T}}>20$GeV for the pseudorapidities and transverse momenta of the leptons. Their invariant mass is required to lie in the range 60--120GeV. The cross-section is determined to be $$\sigma (\mathrm{pp}\to \mathrm{Z}\to {\mathrm{e}}^{+}{\mathrm{e}}^{-})=93.81\pm 0.41(\mathrm{stat})\pm 1.48(\mathrm{syst})\pm 1.14(\mathrm{lumi})\mathrm{pb},$$ where the first uncertainty is statistical and the second reflects all systematic effects apart from that arising from the luminosity, which is given as the third uncertainty. Differential cross-sections are presented as functions of the Z-boson rapidity and of the angular variable ${\varphi }^{\ast }$, which is related to the Z-boson transverse momentum.

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