Formation time dependence of femtoscopic $\pi \pi$ correlations in p+p collisions at $\sqrt{s_{NN}}$=7 TeV

TL;DR

This study uses the UrQMD model to analyze femtoscopic pion-pion correlations in proton-proton collisions at 7 TeV, revealing how these correlations depend on multiplicity and formation time, and constraining the formation time to be less than or equal to 0.8 fm/c.

Contribution

It introduces a combined UrQMD and correlation afterburner approach to study femtoscopic correlations and constrains the formation time in string fragmentation using experimental data.

Findings

Constrains formation time in string fragmentation to ≤ 0.8 fm/c.

Shows dependence of pion-pion correlations on multiplicity and formation time.

Provides comparison with ALICE experimental data.

Abstract

We investigate femtoscopic $\pi \pi$ correlations using the UrQMD approach combined with a correlation afterburner. The dependence of $\pi \pi$ correlations on the charged particle multiplicity and formation time in p+p collisions at $\sqrt{s_{NN}}$= 7 TeV is explored and compared to present ALICE data. The data allows to constrain the formation time in the string fragmentation to $\tau_f \leq 0.8$ fm/c.