Abstract
A search for the critical behavior of strongly interacting matter was done by studying the event-by-event fluctuations of multiplicity and transverse momentum of charged hadrons produced in inelastic p+p collisions and central Be+Be and Ar+Sc collisions at the NA61/SHINE experiment. Results for energy dependence of the scaled variance of the multiplicity distribution and for two families of strongly intensive measures of multiplicity and transverse momentum fluctuations Δ[PT, N] and Σ[PT, N] were presented. The study was performed in rapidity-integrated way and for different pseudorapidity regions, which corresponds to changing the rapidity averaged baryo-chemical potential and the value of temperature at the freeze-out stage. The strongly intensive measure Σ[NF, NB], evaluated in rapidity separated windows, was used in the analysis of short- and long-range multiplicity correlations and is considered to be sensitive for the initial conditions of particle production such as string fragmentation and fusion.
Highlights
Fluctuation study is expected to be one of the most prominent approaches in the search for the critical behaviour of strongly interacting matter [1]
The aim of strong interactions program of NA61/SHINE [4] is to study the properties of the onset of deconfinement and search for the critical point of strongly interacting matter
The most common scenario [11] suggests the hadron gas and quark-gluon plasma regions to be separated by a first order phase transition line at high baryo-chemical potentials and moderate temperatures
Summary
Fluctuation study is expected to be one of the most prominent approaches in the search for the critical behaviour of strongly interacting matter [1]. The main strategy of the NA61/SHINE Collaboration in this study [12] is to perform comprehensive two-dimensional scan of the phase diagram of strongly interacting matter by changing the energy and size of colliding systems. If the critical point exists and could be reached within NA61/SHINE phase diagram scan program, at some values of colliding energy and system size a region of increased fluctuations should be observed. The challenge is to detect this properly since the critical signal could be shadowed by the trivial volume fluctuations or unfavourable detector effects This led to the idea to use intensive and strongly intensive quantities as probes for the critical behaviour [14], [15]
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