Spectra and multiplicities from NA61/SHINE

Abstract

One of the main physics goals of the NA61/SHINE programme on strong interactions is the study of the properties of the onset of deconfinement. This goal is pursued by performing an energy (beam momentum 13A-158A GeV/c) and system size (p+p, p+Pb, Be+Be, Ar+Sc, Xe+La) scan. This paper reviews results and plans of NA61/SHINE. In particular, recently obtained inclusive spectra in inelastic p+p and centrality selected Be+Be, Ar+Sc interactions at the SPS energies will be shown. The energy dependence of quantities inspired by the Statistical Model of the Early Stage (kink, horn and step) shows interesting behavior in p+p interactions, which is not described by Monte-Carlo models. Moreover a comparison with Be+Be collisions and results from other heavy ion experiments will be performed.

Probing the tricritical endpoint of QCD phase diagram at NICAFAIR energies

“…It is interesting that NA49 Collaboration also reported a similar change of the inverse slope parameter of K − mesons, but at a slightly higher collision energy interval √ s NN = 4.9 − 6.3 GeV (see the left panel of Fig. 5 in [5]). Therefore, in order to verify or to disprove our hypothesis it would be necessary to measure the inverse slope parameter of K ± mesons (or their transverse masses) with high precision in the collision energy range √ s NN = 4.3 − 6.3 GeV.…”

“…Note that in contrast to the usual multicomponent HRGM formulations to determine the particle number densities {ρ k } one needs to solve only a system of three equations, namely Eqs. (1), (2) and (5), irrespective to the number of different hard-core radii in the model. Therefore, we believe that IST EoS defined by system (1)-(5) is perfectly suited for the analysis of all hadronic multiplicities which will be measured in the nearest future at RHIC, NICA and FAIR.…”

Event-by-event study of space-time dynamics in flux-tube fragmentation

“…At √ s = 17.3 GeV, the experimental observed heavier meson ratios are σ obs (ρ 0 )/σ obs (π − )=0.12 [62,63], σ obs (K − )/σ obs (π − ) = 0.08 [66], and σ obs (K * + )/σ obs (K + )=0.32 [63]. As discussed in Appendix A, these observed ratios give the slightly modified primary ratios to be σ pri (ρ 0 )/σ pri (π − )=0.19, σ pri (K − )/σ pri (π − )=0.09, and σ pri (K * + )/σ pri (K + )=0.47, after taking into account the feeding of heavier mesons.…”

Two-particle correlations in azimuthal angle and pseudorapidity in inelastic p + p interactions at the CERN Super Proton Synchrotron

“…In particular, weak decays of Λ and K 0 S hadrons lead to production of positively and negatively charged hadrons which are correlated by weak decay kinematics. The EPOS [21] model was used for event generation since it provides a good description of the NA61/SHINE results on the yields of both non-strange and strange particles in p+p collisions [25,26,27]. Correction factors Corr(∆η, ∆φ) were calculated bin-by-bin as the ratio of the correlation functions for simulated events from the Epos [21] model ("pure") and the same events after processing through Geant [23] detector simulation and reconstruction ("rec"), and filtered using event and track selection cuts.…”