Recent results on femtoscopic correlations with the CMS experiment

TL;DR

This paper reviews recent femtoscopic correlation measurements from the CMS experiment at the LHC, revealing insights into the space-time structure of particle emission and hadron interactions in high-energy collisions.

Contribution

It provides the first comprehensive overview of femtoscopic correlation results from CMS, including source shape modeling and strong interaction parameters in pp and PbPb collisions.

Findings

Femtoscopic parameters vary with collision system and multiplicity.

Generalized Gaussian source models are sometimes favored over simple shapes.

Some measurements enable extraction of hadron interaction parameters.

Abstract

The study of femtoscopic correlations in high-energy collisions is a powerful tool to investigate the space-time structure of the particle emitting region formed in such collisions, as well as to probe interactions that the involved particles may undergo after being emitted. An overview of the recent results from the CMS experiment at the LHC on the two-particle femtoscopic correlations measurements using charged particles and identified hadrons in pp and PbPb collisions is presented. In general, the femtoscopic parameters are obtained assuming a Gaussian or an exponential shape to describe the emitting source distribution. In some cases, however, the generalized Gaussian, i.e., the symmetric alpha-stable L\'evy distribution, is favored to describe the source. Some of the measurements allow to extract the parameters of the strong interaction felt by hadrons using their femtoscopic correlations. The studies are performed in a wide range of the pair average transverse momentum (or average transverse mass) and charged particle multiplicities. In addition, prospects for future physics results using the CMS experiment are also discussed.