Measurement of the forward $Z$ boson production cross-section in $pp$ collisions at $\sqrts=7$ TeVстатья

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Дата последнего поиска статьи во внешних источниках: 18 марта 2016 г.

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[1] Measurement of the forward z boson production cross-section in pp collisions at =7 tev / C. LHCb, А. В. Бережной, А. К. Лефлат et al. // Journal of High Energy Physics. — 2015. — Vol. 8. — P. 039. A measurement of the production cross-section for Z bosons that decay to muons is presented. The data were recorded by the LHCb detector during pp collisions at a centre-of-mass energy of 7 TeV , and correspond to an integrated luminosity of 1.0 fb−1. The cross-section is measured for muons in the pseudorapidity range 2.0<η<4.5 with transverse momenta pT>20GeV/c. The dimuon mass is restricted to 60<Mμ+μ-<120GeV/c2. The measured cross-section is σZ→μ+μ−=(76.0±0.3±0.5±1.0±1.3)pb 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 Z boson. Ratios of the production cross-sections of electroweak bosons are presented using updated LHCb measurements of W boson production. A precise test of the Standard Model is provided by the measurement of the ratio σW+→μ+νμ+σW−→μ−ν¯μσZ→μ+μ−=20.63±0.09±0.12±0.05, where the uncertainty due to luminosity cancels. [ DOI ]

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