Abstract
NA61/SHINE is a multipurpose fixed-target facility at the CERN SPS. The main goals of the NA61/SHINE strong-interactions programme are to discover the critical point of strongly interacting matter as well as to study the properties of the onset of deconfinement. In order to reach these goals, a study of hadron production properties is performed in nucleus-nucleus, proton-proton and proton-nucleus interactions as a function of collision energy and size of the colliding nuclei. In this contribution, the NA61/SHINE results from a strong interaction measurement programme are presented. In particular, the latest results from different reactions p+p, Be+Be, Ar+Sc, and Pb+Pb on hadron spectra, as well as intermittency, higher-order moments of multiplicity fluctuations and spectator induced electromagnetic effects are discussed.
Highlights
NA61/SHINE is a multipurpose fixed-target facility at the CERN SPS
The velocity of sound extracted from the width of rapidity distribution of π mesons produced in N+N interactions and central Be+Be and Ar+Sc collisions is consistent with results for central Pb+Pb and Au+Au collisions
Measurements in a broader energy range are needed to conclude on a possible minimum of the sound velocity in small nuclei collisions
Summary
2.1 Particle production properties The main motivation of the NA61/SHINE physics programme are the predictions of the Statistical Model of the Early Stage (SMES) [2]. 1. System size dependence of the K+/π+ ratio obtained at beam momenta ≈ 17 GeV) compared with dynamical (left) and statistical (right) models. Preliminary results on the directed flow of negatively charged pion are presented in the left panel of fig. 3. In mid-central collisions the flow of negatively charged pions has minimum at NA49 & NA61/SHINE preliminary. Preliminary results on the centrality dependence of dv1/dy at mid-rapidity, measured in Pb+Pb collisions at 13A GeV/c were reported. Preliminary results of elliptic flow, v2(pT ), for Pb+Pb collisions at 13A and 30A GeV/c are presented in the right panel of fig. The pT dependence of v2 coefficient of negatively charged pions differs from the one measured for protons, but it does not show any energy dependence
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