Bose-Einstein correlations of charged hadrons in proton-proton collisions at $\sqrt{s} =$ 13 TeV

TL;DR

This paper measures Bose-Einstein correlations of charged hadrons in proton-proton collisions at 13 TeV, analyzing how these correlations vary with multiplicity and momentum, and comparing results with previous data and theories.

Contribution

It introduces three analysis techniques to accurately extract Bose-Einstein correlations from high-multiplicity proton-proton collision data at 13 TeV.

Findings

Measured homogeneity lengths increase with multiplicity.

Correlation results are consistent across different analysis methods.

Data agrees with previous 7 TeV results and theoretical models.

Abstract

Bose-Einstein correlations of charged hadrons are measured over a broad multiplicity range, from a few particles up to about 250 reconstructed charged hadrons in proton-proton collisions at $\sqrt{s} =$ 13 TeV. The results are based on data collected using the CMS detector at the LHC during runs with a special low-pileup configuration. Three analysis techniques with different degrees of dependence on simulations are used to remove the non-Bose-Einstein background from the correlation functions. All three methods give consistent results. The measured lengths of homogeneity are studied as functions of particle multiplicity as well as average pair transverse momentum and mass. The results are compared with data from both CMS and ATLAS at $\sqrt{s} =$ 7 TeV, as well as with theoretical predictions.