Measurement of Bose-Einstein correlations with first CMS data

TL;DR

This paper reports the first measurement of Bose-Einstein correlations in proton-proton collisions at the LHC, revealing how the emission region size varies with event multiplicity.

Contribution

It provides the first experimental measurement of Bose-Einstein correlations using CMS data at 0.9 and 2.36 TeV energies.

Findings

Observation of an enhancement in same-sign particle pairs at small relative momentum.

The emission region size increases with event multiplicity.

First measurement of Bose-Einstein correlations at these energies.

Abstract

Bose-Einstein correlations have been measured using samples of proton-proton collisions at 0.9 and 2.36 TeV center-of-mass energies, recorded by the CMS experiment at the CERN Large Hadron Collider. The signal is observed in the form of an enhancement of pairs of same-sign charged particles with small relative four-momentum. The size of the correlated particle emission region is seen to increase significantly with the particle multiplicity of the event.