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| CMS-PAS-BPH-23-007 | ||
| Measurements of the $ \Upsilon $(1S) meson production in association with a Z boson in proton-proton collisions at $ \sqrt{s}= $ 13 TeV | ||
| CMS Collaboration | ||
| 21 January 2025 | ||
| Abstract: The first measurement of the associated production of an $ \Upsilon $(1S) meson with a Z boson using the four-muon final state is presented. The analysis is based on proton-proton data at $ \sqrt{s}= $ 13 TeV, collected with the CMS detector in 2016--2018 and corresponding to an integrated luminosity of 138 fb$ ^{-1} $. Using the production of the Z boson decaying into four muons as a normalization channel, we measure the ratio of the fiducial cross section $ \sigma(\mathrm{pp}\rightarrow\mathrm{Z}+\Upsilon(\mathrm{1S})) \mathcal{B} (\mathrm{Z}\rightarrow\mu^{+}\mu^{-}) \mathcal{B} (\Upsilon\mathrm{(1S)}\rightarrow\mu^{+}\mu^{-}) $ to the fiducial cross section $ \sigma(\mathrm{pp}\rightarrow Z)\mathcal{B} (Z\rightarrow\mu^{+}\mu^{-}\mu^{+}\mu^{-}) $. The ratio is found to be $ \mathcal{R}_{\mathrm{Z}+\Upsilon\mathrm{(1S)}} = [ $ 21.1 $ \pm $ 5.5 $ \mathrm{(stat)} \pm 0.6\mathrm{(syst)}] \times 10^{-3} $. We also perform a calculation of the effective double-parton scattering cross section, $ \sigma_{\textrm{eff}} $, which is found to be 13.0 $ ^{+7.8}_{-3.5} $ mb. In addition, we measure $ \sigma_{\textrm{eff}} $ differentially, first as a function of the transverse momentum of the $ \Upsilon $(1S) meson, and then as a function of the transverse momentum of the Z boson. | ||
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Compact Muon Solenoid LHC, CERN |
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