Measurement of the forward Z boson production cross-section in pp collisions at √s =7 TeV

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URI: http://hdl.handle.net/10347/22076
ISSN: 1029-8479
DOI: 10.1007/JHEP08(2015)039

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2015

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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 > 20 GeV/c. The dimuon mass is restricted to 60 < M μ + μ − < 120 GeV/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.

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Electroweak interaction| Hadron-Hadron Scattering| Proton-proton scattering| QCD| Forward physics

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Aaij, R., Adeva, B., Adinolfi, M. et al. Measurement of the forward Z boson production cross-section in pp collisions at √s=7 TeV. J. High Energ. Phys. 2015, 39 (2015). https://doi.org/10.1007/JHEP08(2015)039

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© CERN, for the benefit of the LHCb Collaboration. Article funded by SCOAP3. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0), which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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