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| CMS-PAS-TOP-24-011 | ||
| Measurement of the $ t $-channel single top quark cross section in pp collision data at $ \sqrt{s} = $ 5.02 TeV | ||
| CMS Collaboration | ||
| 2025-07-21 | ||
| Abstract: The single top quark $ t $-channel production cross section is measured in proton-proton collisions at $ \sqrt{s}= $ 5.02 TeV using data recorded in 2017, corresponding to an integrated luminosity of 302 pb$^{-1} $. Events with one electron or muon and two or more jets, among which one or more are identified as coming from a b quark, are analyzed. The combined cross section of single top quark (tq) and single top antiquark ($ \bar{\mathrm{t}} $q) production is $ \sigma(\mathrm{tq} + \mathrm{\bar{t}q})= $ 30.2$ ^{+3.7}_{-3.6}$ (stat) $^{+4.4}_{-4.2}$ (syst) $\pm $ 0.6 (lumi) pb, consistent with the standard model prediction of 30.3$ ^{+0.7}_{-0.5} $ pb. The individual cross sections are measured to be $ \sigma(\mathrm{tq})= $ 21.1$ ^{+3.0}_{-2.8} $ (stat) $^{+2.8}_{-2.7} $ (syst) $\pm$ 0.4 (lumi) pb, and $ \sigma(\mathrm{\bar{t}q})= $ 8.2$ ^{+2.4}_{-2.3} $ (stat) $ ^{+1.9}_{-1.8} $ (syst) $\pm$ 0.2 (lumi) pb. Their ratio, $ \mathcal{R}_{t\text{-ch}} $ is also measured, resulting in $ \mathcal{R}_{t\text{-ch}}= $ 2.6$ ^{+1.1}_{-0.7} $ (stat) $^{+0.7}_{-0.2}$ (syst). The measurements are in good agreement with the standard model predictions at next-to-next-to-leading-order accuracy in quantum chromodynamics. | ||
| Links: CDS record (PDF) ; CADI line (restricted) ; | ||
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Compact Muon Solenoid LHC, CERN |
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