CMS-PAS-SMP-22-017

CMS-PAS-SMP-22-017
Measurement of the inclusive cross section of Z boson production in pp collisions at $ \sqrt{s}= $ 13.6 TeV
CMS Collaboration
21 August 2023

Abstract: A measurement of the Z boson production cross section in proton-proton collisions at a center-of-mass energy of 13.6 TeV is presented for Z bosons decaying to a pair of muons. Data collected in 2022 and corresponding to an integrated luminosity of 5.04 fb$ ^{-1} $ with two identified muons in the final state are used to extract a value for the product of the signal cross section and branching fraction. The measurement is done in a fiducial region defined by the kinematical acceptance of the CMS detector and extrapolated to the full phase space resulting in a total cross section for Z boson production in the muonic decay channel with an invariant dimuon mass in the range of 60 to 120GeV of $ \sigma(\mathrm{pp} \rightarrow \mathrm{Z + X})\mathcal{B}(\mathrm{Z} \rightarrow \mu^{+}\mu^{-}) = $ ( 2.010 $ \pm $ 0.001 (stat) $\pm$ 0.018 (syst) $\pm$ 0.046 (lumi) $\pm$ 0.007 (theo) ) nb. The fiducial as well as the extrapolated total result are both dominated by systematic uncertainties and are in agreement with theoretical predictions, calculated at next-to-next-to-leading order accuracy in quantum chromodynamics and recent parton distribution functions.
Links: CDS record (PDF) ; CADI line (restricted) ;

Figures & Tables	Summary	References	CMS Publications

Figures
png pdf	Figure 1: The post--fit distribution of the $ \mathrm{Z}\to\mu^{-}\mu^{+} $ signal region. The bottom panel of the plot shows the ratio of the number of events observed in data to that of the signal and background predictions.
png pdf	Figure 2: Comparison of measured total cross sections times branching fractions for Z boson production at different center-of-mass energies with the theory prediction at NNLO QCD accuracy obtained from DYTURBO. The uncertainties in the theory prediction include variations of the renormalization and factorization scales, as well as uncertainties due to the choice of the PDFs.

Tables
png pdf	Table 1: Systematic uncertainties in percentage for the fiducial measurement. For completeness, also the statistical uncertainty is given.
png pdf	Table 2: Post-- and pre--fit yields in the fiducial region. The post--fit uncertainties only include systematic uncertainties, and neither statistic nor luminosity uncertainty.

Summary

In summary, measurements of fiducial and total inclusive Z boson production cross sections in proton-proton collisions at 13.6 TeV multiplied by the $ \mathrm{Z} \to \mu^{+}\mu^{-} $ branching fraction are presented. Muon final states are studied in data samples collected with the CMS detector corresponding to integrated luminosity of 5.04 $ \pm $ 0.12 fb$^{-1}$. The measured product of the total cross section and branching fraction for muonic decays of Z bosons is $ \sigma(\mathrm{p}\mathrm{p} \to \mathrm{Z} + X)\mathcal{B}(\mathrm{Z} \to \mu^{+}\mu^{-}) = $ ( 2.010 $ \pm $ 0.001 (stat) $\pm$ 0.018 (syst) $\pm$ 0.046 (lumi) $\pm$ 0.007 (theo) ) nb for the dimuon invariant mass in the range of 60 to 120 GeV, well in agreement with theory calculations. For the result the statistical component of the uncertainty is negligible.

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