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The search for experimental signatures of the critical point (CP) of stronglyinteracting matter is one of the main objectives of the NA61/SHINE experimentat CERN SPS. In the course of the experiment, a beam momentum and system sizescan is performed. Local proton density fluctuations in transverse momentumspace represent an order parameter of the chiral phase transition and areexpected to scale according to a universal power-law in the vicinity of the CP;we probe their behavior through an intermittency analysis of the proton secondscaled factorial moments (SSFMs) in transverse momentum space. Previous suchanalyses revealed power-law behavior in NA49 Si+Si collisions at 158$A$GeV/$c$, with no intermittency observed in lighter or heavier NA49 & NA61/SHINEsystems at the same energy. We now extend the analysis to NA61/SHINE Ar+Sccollisions at 150$A$ GeV/$c$, similar in size and baryochemical potential toNA49 Si+Si. We employ statistical techniques to subtract non-criticalbackground and estimate statistical and systematic uncertainties. Subsequently,we use Monte Carlo simulations to assess the statistical significance of theobserved intermittency effect.

Searching for the critical point of strongly interacting matter in nucleus-nucleus collisions at CERN SPS