Measurement of tW differential cross-sections with ATLAS at 13 TeV

TL;DR

This paper presents a measurement of the differential cross-sections for tW production at 13 TeV using ATLAS data, providing detailed insights into particle-level observables and validating theoretical models.

Contribution

First measurement of tW differential cross-sections at 13 TeV with detailed particle-level analysis and comparison to multiple Monte Carlo predictions.

Findings

Results agree with Monte Carlo simulations

Cross-sections measured in a specific fiducial phase-space

Uncertainties reduced through normalization

Abstract

The cross-section to produce a $W$ boson in association with a top quark is measured differentially with respect to several particle-level final-state observable quantities. The measurements are performed using $36.1$~\mbox{fb$^{-1}$} of $pp$ collision data at $\sqrt{s}=13~\mathrm{TeV}$ collected in 2015 and 2016, by the ATLAS detector at the LHC. Cross-sections are measured in a fiducial phase-space defined by the presence of two charged leptons and exactly one jet identified as containing $B$ hadrons. Measurements are normalised to the fiducial cross-section, causing several of the main uncertainties to cancel. The results are found to be in good agreement with predictions from several Monte Carlo generators.