Estimation of non-femtoscopic effects in p+p and p+A collisions at RHIC energies using PYTHIA and HIJING generators

TL;DR

This paper investigates non-femtoscopic effects in small collision systems at RHIC energies by using PYTHIA and HIJING simulations to estimate their impact on particle correlation measurements.

Contribution

It introduces a simulation-based method to quantify non-femtoscopic effects in p+p and p+A collisions at RHIC energies, aiding in more accurate femtoscopic source size measurements.

Findings

Non-femtoscopic effects significantly distort correlation functions.

Simulations with PYTHIA and HIJING can estimate these effects.

Comparison with experimental data validates the simulation approach.

Abstract

The spatial extents of particle emission source in high-energy collisions can be measured using two-particle femtoscopic correlations. In collisions with small multipli cities, such as proton-proton collisions, correlation functions can be distorted by non-femtos copic effects, for example due to the correlations that caused by energy-momentum conservatio n laws, jets and mini-jets. To estimate these effects, a simulation of p+p collisions at $\sqrt{s}$=200 and $\sqrt{s}$=510 GeV using PYTHIA 6.4.28 and HIJING 1.383, and p+Au collisions at $\sqrt{s_{NN}}$=200 GeV using HIJING were performed. Charged pion and kaon correlation functions obtained from the Monte Carlo generators and their comparison to the experimental data are p resented.