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

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Schmelling,  M.       
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Zavertyaev,  M.       
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Citation

LHCb Collaboration, Aaij, R., Abdelmotteleb, A. S. W., Abellan Beteta, C., Abudinén, F., Ackernley, T., 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): 70. doi:10.1007/JHEP02(2024)070.


Cite as: https://hdl.handle.net/21.11116/0000-000E-6F47-7
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 pT > 20 GeV/c. The integrated cross-section is determined to be

σZ→μ+μ = 39.6 ± 0.7(stat) ± 0.6(syst) ± 0.8(lumi) pb

for the di-muon invariant mass in the range 60 < Mμμ < 120 GeV/c2. 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 constant.

Based on a previous LHCb measurement of the Z boson production cross-section in pPb collisions at √sNN = 5.02 TeV, the nuclear modification factor RpPb 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