Femtoscopy of proton-proton collisions at the LHC with the ALICE experiment

TL;DR

This paper analyzes two-particle Bose-Einstein correlations in proton-proton collisions at various energies using ALICE data, revealing non-Gaussian shapes due to resonance decays, and providing insights into the emission region's structure.

Contribution

It introduces a detailed three-dimensional analysis of correlation functions, showing they are better described by mixed exponential and Gaussian forms, highlighting resonance effects.

Findings

Correlation functions are better modeled by exponential and Gaussian forms in different directions.

Resonance decays significantly influence the shape of the emission region.

Non-Gaussian shapes indicate complex emission dynamics.

Abstract

We present the results on two-particle Bose-Einstein correlations measured in proton-proton collisions at center of mass energies of sqrt{s}=0.9 TeV, sqrt{s}=2.76 TeV and sqrt{s}=7 TeV registered by the ALICE experiment at the Large Hadron Collider. Detailed analysis reveals that the three dimensional experimental correlation functions do not have Gaussian shape in two dimensions. We found that they are better described by an exponential functional form in the outward and longitudinal directions, while the sideward remains a Gaussian. This is interpreted as a result of a significant contribution of strongly decaying resonances to the shape of the emission region.