Measurement of the properties of inelastic p-p events with the ATLAS detector

TL;DR

This paper reports new measurements of inelastic proton-proton collision properties at 7 TeV using the ATLAS detector, comparing data with Monte Carlo models and analyzing underlying event activity and particle correlations.

Contribution

It provides the first detailed measurements of minimum bias distributions and underlying event activity at 7 TeV, offering data to improve theoretical models.

Findings

Distributions vary across phase-space regions

Underlying event activity correlates with the highest transverse momentum track

Angular correlations reveal model sensitivities

Abstract

New measurements are presented from proton-proton collisions at sqrt(s) = 7 TeV recorded with the ATLAS detector at the LHC. Minimum bias distributions are measured in distinct phase-space regions and compared with Monte Carlo model predictions. Activity in the underlying event is measured with respect to the track with the highest tranverse momentum in the event. Angular correlations between charged particles are studied to provide model-sensitive measurements.