Measurement of the Z boson production cross-section in pp collisions at √𝑠 = 5.02 TeV
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Author(s)
Aaij, R.
Abdelmotteleb, A. S. W.
Abellan Beteta, C.
Abudinén, F.
Ackernley, T.
Adeva, B.
Adinolfi, M.
Adlarson, P.
Afsharnia, H.
Agapopoulou, C.
Date Issued
February 13, 2024
Publisher
Springer Science and Business Media LLC
Citation
Journal of High Energy Physics. 2024 Feb 13;2024(2):70
Version
Final published version
Abstract
The first measurement of the Z boson production cross-section at centre-of-mass energy $$ \sqrt{s} $$
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$$ {\sigma}_{Z\to \mu +\mu -}=39.6\pm 0.7\left(\textrm{stat}\right)\pm 0.6\left(\textrm{syst}\right)\pm 0.8\left(\textrm{lumi}\right)\textrm{pb} $$ 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 < 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 $$ \sqrt{s_{NN}} $$ s NN = 5.02 TeV, the nuclear modification factor RpPb is measured for the first time at this energy. The measured values are $$ {1.2}_{-0.3}^{+0.5} $$ 1.2 − 0.3 + 0.5 (stat) ± 0.1(syst) in the forward region (1.53 <$$ {y}_{\mu}^{\ast } $$ y μ ∗ < 4.03) and $$ {3.6}_{-0.9}^{+1.6} $$ 3.6 − 0.9 + 1.6 (stat) ± 0.2(syst) in the backward region (−4.97 <$$ {y}_{\mu}^{\ast } $$ y μ ∗ < −2.47), where $$ {y}_{\mu}^{\ast } $$ y μ ∗ represents the muon rapidity in the centre-of-mass frame.
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$$ {\sigma}_{Z\to \mu +\mu -}=39.6\pm 0.7\left(\textrm{stat}\right)\pm 0.6\left(\textrm{syst}\right)\pm 0.8\left(\textrm{lumi}\right)\textrm{pb} $$ 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 < 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 $$ \sqrt{s_{NN}} $$ s NN = 5.02 TeV, the nuclear modification factor RpPb is measured for the first time at this energy. The measured values are $$ {1.2}_{-0.3}^{+0.5} $$ 1.2 − 0.3 + 0.5 (stat) ± 0.1(syst) in the forward region (1.53 <$$ {y}_{\mu}^{\ast } $$ y μ ∗ < 4.03) and $$ {3.6}_{-0.9}^{+1.6} $$ 3.6 − 0.9 + 1.6 (stat) ± 0.2(syst) in the backward region (−4.97 <$$ {y}_{\mu}^{\ast } $$ y μ ∗ < −2.47), where $$ {y}_{\mu}^{\ast } $$ y μ ∗ represents the muon rapidity in the centre-of-mass frame.
Subjects
Nuclear and High Energy Physics
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
10.1007/jhep02(2024)070
