First t-channel single top measurement in pp collisions at an energy in the centre-of-mass of √s = 5.02 TeV with the ATLAS experiment

A single top quark production measurement in proton-proton (pp) collisions at the Large Hadron Collider (LHC) at an energy in the centre-of-mass √s = 5.02 TeV with data collected by the ATLAS experiment is reported. This analysis uses a Boosted Decision Tree (BDT) to separate signal from background events and its output distribution is used for a Profile-Likelihood fit. Some of the calibrations used in this analysis are taken from a recent ATLAS top quark pair production cross-section measurement at the same energy of √s = 5.02 TeV (ATLAS Collaboration, JHEP, 06 (2023) 138). The analysis takes into account forward jets to enhance the t-channel process, with an ad-hoc calibration for their energy.