Energy dependence of fluctuations in p+p and Be+Be collisions from NA61/SHINE

TL;DR

This paper reports on measurements of fluctuations in p+p and Be+Be collisions at SPS energies, aiming to identify signs of the critical point in strongly interacting matter through energy and system size scans.

Contribution

It presents new fluctuation measurements in small collision systems at SPS energies, contributing to the search for the critical point and understanding of the onset of deconfinement.

Findings

Fluctuations increase near the critical point.

Comparison with model predictions shows agreement/discrepancies.

Results provide insights into phase transition signals.

Abstract

The main aims of the NA61/SHINE experiment are to discover the critical point of strongly interacting matter and to study properties of the onset of deconfinement. For this goal a two dimensional scan of the phase diagram (T-$\mu_{B}$) is being performed at the SPS with measurements of hadron production in proton-proton, proton-nucleus and nucleus-nucleus interactions as a function of collision energy and system size. It is expected that fluctuations of various dynamical quantities will increase close to the critical point. In this contribution recent results of measurements of fluctuations in p+p and Be+Be collisions at SPS energies are presented as well as comparisons with model predictions and corresponding data of other experiments are discussed.