Johannes Hessler | Searcharxiv

arXiv2026

Differential top quark cross section results from the ATLAS and CMS experiments

This report summarizes recent results of differential top quark cross section measurements performed by the ATLAS and CMS experiments. The $t\bar{t}$ process is studied as well as the production of single (anti-)top quarks and the interference with other Standard Model processes of the same final state. State-of-the-art theory predictions are compared to the data. No theory model is able to describe the data across all bins, but an improved description of the data when moving to predictions in higher orders in perturbative QCD can be observed.

hep-ex↗

arXiv2021

Measurement of the 1-jettiness in deep-inelastic scattering at HERA

A first measurement of the 1-jettiness event shape observable $τ_1^b$ in neutral-current deep inelastic scattering is presented. For the measurement, the equivalence of $τ_1^b$ to the DIS thrust observable defined in the Breit frame is utilised. The data were taken by the H1 experiment at HERA from 2003 to 2007 at a centre of mass energy of $\sqrt{s}=319 \text{ GeV}$. The data amount to an integrated luminosity of $351.6\text{ pb}^{-1}$. The triple-differential cross sections are presented as a function of the 1-jettiness $τ^1_b$, the virtuality of the exchanged boson $Q^2$ and the inelasticity of the event $y$. The data exhibit a sensitivity to the strong coupling constant and to resummation and hadronisation effects, as well as to the parton distribution functions of the proton. The data are compared to selected predictions.

hep-ex↗