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Paper

Measurement of the forward $Z$ boson production cross-section in $pp$ collisions at $\sqrt{s}$ = 7 TeV

Abstract

A measurement of the production cross-section for bosons that decay to muons is presented. The data were recorded by the LHCb detector during collisions at a centre-of-mass energy of 7 TeV, and correspond to an integrated luminosity of 1.0 fb. The cross-section is measured for muons in the pseudorapidity range with transverse momenta GeV/c. The dimuon mass is restricted to GeV/c. The measured cross-section is where the uncertainties are due to the sample size, systematic effects, the beam energy and the luminosity. This result is in good agreement with theoretical predictions at next-to-next-to-leading order in perturbative quantum chromodynamics. The cross-section is also measured differentially as a function of kinematic variables of the boson. Ratios of the production cross-sections of electroweak bosons are presented using updated LHCb measurements of boson production. A precise test of the Standard Model is provided by the measurement of the ratio where the uncertainty due to luminosity cancels.