Charged-particle distributions at low transverse momentum in $\sqrt{s}$=13 TeV pp interactions measured with the ATLAS detector at the LHC

TL;DR

This paper presents detailed measurements of charged-particle distributions at low transverse momentum in 13 TeV proton-proton collisions, providing data to test and improve particle production models at the LHC.

Contribution

It offers the first comprehensive set of low transverse momentum charged-particle distributions at 13 TeV, with corrections for detector effects and comparisons to multiple Monte Carlo models.

Findings

Charged-particle multiplicity distributions are measured across various pseudorapidities.

Mean transverse momentum increases with charged-particle multiplicity.

Data show discrepancies with some Monte Carlo predictions, indicating areas for model improvement.

Abstract

Measurements of distributions of charged particles produced in proton-proton collisions with a centre-of-mass energy of 13 TeV are presented. The data were recorded by the ATLAS detector at the LHC and correspond to an integrated luminosity of 151 $\mu$b$^{-1}$. The particles are required to have a transverse momentum greater than 100 MeV and an absolute pseudorapidity less than 2.5. The charged-particle multiplicity, its dependence on transverse momentum and pseudorapidity and the dependence of the mean transverse momentum on multiplicity are measured in events containing at least two charged particles satisfying the above kinematic criteria. The results are corrected for detector effects and compared to the predictions from several Monte Carlo event generators.