NA61/SHINE results on fluctuations and correlations in p+p and Be+Be interactions at CERN SPS energies

TL;DR

This paper reports on fluctuations and correlations in p+p and Be+Be collisions at CERN SPS energies, aiming to explore the phase diagram of strongly interacting matter and search for the critical point.

Contribution

It provides new experimental results on fluctuations and correlations in small systems across different energies, contributing to the understanding of the QCD phase diagram.

Findings

Observation of transverse momentum fluctuations in Be+Be and p+p collisions.

Analysis of two-particle correlations in pseudorapidity and azimuthal angle.

Discussion of conservation laws and resonance decay effects on fluctuations.

Abstract

The aim of the NA61/SHINE strong interaction program is to explore the phase diagram of strongly interacting matter. The main physics goals are the study of the onset of deconfinement and the search for the critical point of strongly interacting matter. These goals are pursued by performing a beam momentum (13$A$ - 158$A$ GeV/c) and system size (p+p, p+Pb, Be+Be, Ar+Sc, Xe+La) scan. This contribution presents results on transverse momentum and multiplicity fluctuations from the Be+Be and p+p energy scan. Also, results on two-particle correlations in pseudorapidity and azimuthal angle obtained in p+p interactions will be shown. The influence of conservation laws and resonance decays on multiplicity and chemical fluctuations of identified particles in p+p interactions will be discussed. Obtained results will be compared with data from other experiments and with model predictions.