Inclusive and differential cross-section measurements in tW with CMS in Run 3

The first measurements of the inclusive and normalised differential cross sections for the production of single top quarks in association with a W boson in proton-proton collisions at a centre-of-mass energy of 13.6 TeV are presented. The data used were recorded with the CMS detector at the LHC during 2022, and correspond to an integrated luminosity of 34.7 fb⁻¹. The analysed events contain one muon and one electron in the final state. A cross section of 84.1± 2.1(stat)\,+9.8-10.2(syst)± 3.3(lumi) pb is obtained, consistent with the predictions of the standard model. For the differential measurements, a fiducial region is defined according to the detector acceptance. The resulting differential distributions are unfolded to particle level showing good agreement with the predictions at next-to-leading order in perturbative quantum chromodynamics.