Study of KNO scaling in pp collisions at $\sqrt{s}$ from 0.9 to 13 TeV using results of the ATLAS at the LHC

TL;DR

This study examines how charged-particle multiplicity and transverse momentum distributions in proton-proton collisions at the LHC conform to KNO scaling across energies from 0.9 to 13 TeV, revealing shape invariance and energy dependence.

Contribution

It provides a detailed analysis of KNO scaling behavior in pp collisions at various energies using ATLAS data, highlighting shape invariance and energy trends in multiplicity and transverse momentum distributions.

Findings

Charged-particle multiplicity distributions are similar on the KNO scale across energies.

Distributions tend to be energy-independent at the highest energies.

Average transverse momentum distributions increase with energy on the KNO scale.

Abstract

The comparisons of the charged-particle multiplicity and the average transverse momentum distributions on the scaled multiplicity, KNO scale, using the results of the ATLAS collaboration at the LHC are presented. These distributions were measured in proton-proton collisions at centre-of-mass energies from 0.9 to 13 TeV for the absolute pseudorapidity region less than 2.5 and two samples of events with each charged-particle transverse momentum greater than 100 and 500 MeV, respectively. The shape evolution of the multiplicity distributions with a collision energy is studied in terms of KNO scaling variables. The charged-particle multiplicity distributions on the KNO scale have the similar shape and decrease with increasing collision energy. The KNO distributions tend to be independent of energy for the highest energies. The average transverse momentum distributions on the KNO scale have a similar shape and increase with increasing collision energy.