# Investigating the "kink" plot as a signal of the onset of deconfinement

## TL;DR

This paper analyzes the 'kink' plot as an indicator of the transition from hadronic matter to quark-gluon plasma in heavy ion collisions, presenting new data from Ar+Sc collisions and comparing with other experiments.

## Contribution

It introduces new measurements of the 'kink' plot for Ar+Sc collisions at various energies, enhancing understanding of the deconfinement onset in heavy ion collisions.

## Key findings

- Observation of the 'kink' in Ar+Sc collisions at multiple energies.
- Comparison shows consistency with previous measurements.
- Provides preliminary data enriching the phase diagram analysis.

## Abstract

One of the physics goals of the NA61/SHINE collaboration at the CERN Super Proton Synchrotron is to study the phase diagram of hadronic matter. To this end, a series of heavy ion collision measurements are performed. It is believed that above a certain collision energy and system size a phase transition between hadronic matter and quark-gluon plasma occurs. A number of observables has been developed to determine which of the phases was created at the early stage of the collision. This report discusses the dependence of the ratio of the mean number of produced pions to the mean number of wounded nucleons on the Fermi energy measure. For comparison with other measurements this is often presented in the form of the the "kink" plot. This plot is presented enriched with preliminary results for Ar+Sc central collisions at 13A, 19A, 30A, 40A, 75A and 150A GeV/c beam momentum. The results are finally compared to data from other experiments.