Two particle correlations from the energy scan with p+p interactions

TL;DR

This paper presents preliminary results on two-particle correlations in proton-proton interactions across various energies, aiming to explore signals related to the QCD phase transition and critical point.

Contribution

It provides new measurements of two-particle correlations in p+p collisions over a range of energies, contributing to the search for the QCD critical point.

Findings

Observation of a striking evolution of correlations with collision energy

Comparison with other experiments and models highlights energy-dependent features

Results contribute to understanding the onset of deconfinement and critical phenomena

Abstract

The NA61/Shine experiment aims to discover the critical point of strongly interacting matter and study the properties of the onset of deconfinement. These goals are to be achieved by performing a two dimensional phase diagram T-mu_B scan by measurements of hadron production properties in proton-proton, proton-nucleus and nucleus-nucleus interactions as a function of collision energy and system size. Close to the phase transition and/or close to the critical point large fluctuations are predicted. In this contribution preliminary results on two-particle correlations in pseudorapidity and azimuthal angle will be presented for p+p interactions at beam momenta: 20, 31, 40, 80 and 158 GeV/c. The NA61/Shine results will be compared with the corresponding data of other experiments and model predictions. A striking evolution with collision energy is observed.