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 p_T > 20 GeV/c. The dimuon mass is restricted to 60 < M(μ+ μ−) < 120 GeV/c^2. The measured cross-section is σ(Z → 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 [σ(W+ → μ+ νμ) + σ(W− → μ− anti-νμ)]/σ(Z → μ+ μ−) = 20.63 ± 0.09 ± 0.12 ± 0.05, where the uncertainty due to luminosity cancels.

Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., et al. (2015). Measurement of the Forward Z Boson Production Cross-Section in pp Collisions at √s = 7 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2015(8), 0-36 [10.1007/JHEP08(2015)039].

Measurement of the Forward Z Boson Production Cross-Section in pp Collisions at √s = 7 TeV

Capriotti, L.;CARBONE, ANGELO;FERRARI, FABIO;GALLI, DOMENICO;MUSSINI, MANUEL;PATRIGNANI, CLAUDIA;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;ZANGOLI, MARIA;
2015

Abstract

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 p_T > 20 GeV/c. The dimuon mass is restricted to 60 < M(μ+ μ−) < 120 GeV/c^2. The measured cross-section is σ(Z → 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 [σ(W+ → μ+ νμ) + σ(W− → μ− anti-νμ)]/σ(Z → μ+ μ−) = 20.63 ± 0.09 ± 0.12 ± 0.05, where the uncertainty due to luminosity cancels.
2015
Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., et al. (2015). Measurement of the Forward Z Boson Production Cross-Section in pp Collisions at √s = 7 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2015(8), 0-36 [10.1007/JHEP08(2015)039].
Aaij, R.; Adeva, B.; Adinolfi, M.; Affolder, A.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; Alessio, F.; Alexander, M.; Ali, S.; Alkhazov, G.; Cartelle, P...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/515556
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