The first measurement of the Z boson production cross-section at centre-of-mass energy √s = 5.02 TeV in the forward region is reported, using pp collision data collected by the LHCb experiment in year 2017, corresponding to an integrated luminosity of 100 ± 2 pb^−1. The production cross-section is measured for final-state muons in the pseudorapidity range 2.0 < η < 4.5 with transverse momentum p_T > 20 GeV/c. The integrated cross-section is determined to be σ_{Z → μ+ μ−} =39.6 ± 0.7(stat) ± 0.6(syst) ± 0.8(lumi) pb for the di-muon invariant mass in the range 60 < M_{μμ} < 120 GeV/c^2. This result and the differential cross-section results are in good agreement with theoretical predictions at next-to-next-to-leading order in the strong coupling. Based on a previous LHCb measurement of the Z boson production cross-section in p Pb collisions at √s_{NN} = 5.02 TeV, the nuclear modification factor R_{p Pb} is measured for the first time at this energy. The measured values are 1.2{−0.3}{+0.5}(stat) ± 0.1(syst) in the forward region (1.53 < yμ* < 4.03) and 3.6{−0.9}{+1.6}(stat) ± 0.2(syst) in the backward region (−4.97 < yμ* < −2.47), where yμ* represents the muon rapidity in the centre-of-mass frame.

Aaij, R., Abdelmotteleb, A.S.W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adeva, B., et al. (2024). Measurement of the Z boson production cross-section in pp collisions at √s = 5.02 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2024(2), 0-37 [10.1007/jhep02(2024)070].

Measurement of the Z boson production cross-section in pp collisions at √s = 5.02 TeV

Carbone, A.;Ferrari, F.;Galli, D.;Patrignani, C.;Spedicato, E.;Villa, A.;
2024

Abstract

The first measurement of the Z boson production cross-section at centre-of-mass energy √s = 5.02 TeV in the forward region is reported, using pp collision data collected by the LHCb experiment in year 2017, corresponding to an integrated luminosity of 100 ± 2 pb^−1. The production cross-section is measured for final-state muons in the pseudorapidity range 2.0 < η < 4.5 with transverse momentum p_T > 20 GeV/c. The integrated cross-section is determined to be σ_{Z → μ+ μ−} =39.6 ± 0.7(stat) ± 0.6(syst) ± 0.8(lumi) pb for the di-muon invariant mass in the range 60 < M_{μμ} < 120 GeV/c^2. This result and the differential cross-section results are in good agreement with theoretical predictions at next-to-next-to-leading order in the strong coupling. Based on a previous LHCb measurement of the Z boson production cross-section in p Pb collisions at √s_{NN} = 5.02 TeV, the nuclear modification factor R_{p Pb} is measured for the first time at this energy. The measured values are 1.2{−0.3}{+0.5}(stat) ± 0.1(syst) in the forward region (1.53 < yμ* < 4.03) and 3.6{−0.9}{+1.6}(stat) ± 0.2(syst) in the backward region (−4.97 < yμ* < −2.47), where yμ* represents the muon rapidity in the centre-of-mass frame.
2024
Aaij, R., Abdelmotteleb, A.S.W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adeva, B., et al. (2024). Measurement of the Z boson production cross-section in pp collisions at √s = 5.02 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2024(2), 0-37 [10.1007/jhep02(2024)070].
Aaij, R.; Abdelmotteleb, A. S. W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Afsharnia, H.; Agapopoulou,...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1001680
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