Highlights from the NA61/SHINE experiment

The NA61/SHINE experiment is a fixed-target, broad acceptance facility at the CERN SPS. This contribution summarizes the most recent results from the strong interactions NA61/SHINE programme and presents news on the detector upgrade in preparation for the future data taking. The strong interactions programme consists in a two-dimensional scan in beam momentum (from 13\(A\) to 150\(A\)/158\(A\) GeV/\(c\), \(\sqrt {s_{NN}}\) from 5.1 to 17.3 GeV) and system size (\(p+p\), Be\(+\)Be, Ar\(+\)Sc, Xe\(+\)La reactions). The experiment searches for the second-order critical end-point in the temperature versus baryo-chemical potential phase diagram and studies the properties of the onset of deconfinement discovered by its predecessor, NA49 at the CERN SPS. The presented results include \(K/\pi \) multiplicity ratios as a function of energy and system size, singly and multi-strange hadron production in \(p+p\) reactions, multiplicity and net-charge fluctuations measured by higher order moments in \(p+p\), Be\(+\)Be, and Ar\(+\)Sc collisions, proton and charged hadron intermittency in Ar\(+\)Sc and Pb\(+\)Pb reactions, HBT measurements in Ar\(+\)Sc, and collective electromagnetic effects in Ar\(+\)Sc collisions.