Abstract
The NA61/SHINE experiment at the CERN SPS studies hadron production properties in hadron-nucleus and nucleus-nucleus collisions. Recent results from p+p, Be+Be and Ar+Sc interactions provide new data on the system size and energy dependence of hadron multiplicities, spectra and fluctuations. In particular, they indicate a threshold for formation of large clusters interpreted as the onset of fireball. A scaled-factorial-moment analysis of the proton density fluctuations in Ar+Sc collisions at 150A GeV/c shows an intermittency signal, which may be a first trace of critical behavior. The main objective of the future NA61/SHINE program is to obtain high-precision data on charm hadron production. This new program is planed to start in 2021, after the Long Shutdown 2 of the CERN accelerators. It requires significant upgrades of the NA61/SHINE detectors in order to increase the data readout rate tenfold.
Highlights
N A 61/SH IN E is a fixed-target experim ent a t th e C ERN S uper-Proton-Synchrotron (SPS) measuring the hadron production in hadron-nucleus and nucleus-nucleus collisions w ith a large acceptance detector system [1]
The analysis of X e+ L a at 150A GeV/c as well as A r+Sc at 75A GeV/c has the highest priority in N A 61/SH IN E as it might strengthen the evidence for the expected nonm onotonic system size and collision energy dependence of an interm ittency signal from the critical point
O pen charm m easurem ents T he N A 61/SH IN E charm program is an extension of th e previous studies into th e c-quark mass dom ain in order to learn about the mechanism of charm production in heavy-ion collisions and to gain a better insight into the phase transition to the quark-gluon plasma
Summary
N A 61/SH IN E is a fixed-target experim ent a t th e C ERN S uper-Proton-Synchrotron (SPS) measuring the hadron production in hadron-nucleus and nucleus-nucleus collisions w ith a large acceptance detector system [1]. A nother indication of the onset of deconfinem ent suggested by th e SMES m odel is a step structure (plateau) in the energy dependence of the inverse slope param eter T of the transverse mass distribution of K mesons.
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