Measurements of minimum bias events, underlying event and particle production properties in ATLAS

TL;DR

This paper presents measurements of minimum bias events, underlying event, and particle production in proton-proton collisions at 13 TeV using ATLAS, comparing results with previous 7 TeV data to enhance understanding of basic collision properties.

Contribution

First measurements of minimum bias and underlying event properties at 13 TeV with ATLAS, extending previous 7 TeV studies and providing new insights into proton-proton interactions.

Findings

Charged particle pseudorapidity density distributions measured

Underlying event properties characterized with respect to high-$p_{T}$ particles

Comparison shows energy dependence of collision properties

Abstract

The measurements of the minimum bias events provide valuable information on the basic properties of the $pp$ interactions. The results at the new highest energy of $pp$ collisions, $\sqrt{s}$ = 13 TeV, obtained using the ATLAS detector, are shown. They include distributions of charged particle pseudorapidity density, transverse momentum and multiplicity. The properties of the underlying event, determined with respect to a leading high-$p_{T}$ particle, are also presented. In both cases the new results are compared with those from earlier studies of the $pp$ collisions at $\sqrt{s}$ = 7 TeV.