First measurement of the top quark pair production cross section in proton-proton collisions at $\sqrt{s}$ = 13.6 TeV

Abstract

The first measurement of the top quark pair ($\mathrm{t}\bar{\mathrm{t}}$) production cross section in proton-proton collisions at $\sqrt{s}$ = 13.6 TeV is presented. Data recorded with the CMS detector at the CERN LHC in Summer 2022, corresponding to an integrated luminosity of 1.21 fb${}^{-1}$, are analyzed. Events are selected with one or two charged leptons (electrons or muons) and additional jets. A maximum likelihood fit is performed in event categories defined by the number and flavors of the leptons, the number of jets, and the number of jets identified as originating from b quarks. An inclusive $\mathrm{t}\bar{\mathrm{t}}$ production cross section of 881 $\pm$ 23 (stat+syst) $\pm$ 20 (lumi) pb is measured, in agreement with the standard model prediction of 924 ${}_{-40}^{+32}$ pb.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables, including an additional supplementary figure, can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/TOP-22-012 (CMS Public Pages)

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