Two-pion Bose-Einstein correlations in central Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV

TL;DR

This paper reports the first measurement of two-pion Bose-Einstein correlations in central Pb-Pb collisions at 2.76 TeV, revealing larger source sizes and longer decoupling times than previous RHIC results.

Contribution

It provides the first experimental data on two-pion correlations at LHC energies, extending understanding of pion source characteristics in heavy-ion collisions.

Findings

Source radii increase with collision energy

Pion homogeneity volume is significantly larger than at RHIC

Decoupling time is longer than previously measured

Abstract

The first measurement of two-pion Bose-Einstein correlations in central Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 2.76$ TeV at the Large Hadron Collider is presented. We observe a growing trend with energy now not only for the longitudinal and the outward but also for the sideward pion source radius. The pion homogeneity volume and the decoupling time are significantly larger than those measured at RHIC.