Abstract
Evidence for the onset of deconfinement in central Pb + Pb collisions was reported by NA49 in fixed target measurements at beam momentum 30A GeV/c. This observation motivated the NA61/SHINE program started in 2009 at the CERN SPS, which, in particular, aims to study properties of the onset of deconfinement by measurements of hadron production in proton-proton, proton–nucleus and nucleus-nucleus collisions.This contribution presents spectra of charged pions produced in p + p interactions and 7Be + 9Be collisions at 20A–158AGeV/c beam momentum. The NA61/SHINE results are compared with the corresponding NA49 data from central Pb + Pb collisions at the same beam momenta per nucleon.
Highlights
The NA61/SHINE experiment at the CERN SPS conducts a broad programme of hadron production measurement in proton-proton, nucleus-nucleus, protonnucleus and pion-nucleus collisions
This paper presents double differential spectra of negatively charged pions produced in p+p interactions at
Time of Flight (ToF) walls are placed behind the MTPCs
Summary
The NA61/SHINE experiment at the CERN SPS conducts a broad programme of hadron production measurement in proton-proton, nucleus-nucleus, protonnucleus and pion-nucleus collisions. This paper focuses on measurements of collisions of protons and nuclei at different projectile momenta. A two-dimensional scan is performed in beam energy from 13A to 158A GeV/c and in system size from p+p up to Xe+La. It is planned to repeat and extend measurements of the NA49 experiment on Pb+Pb collsions [1, 2] with the upgraded. The scan aims to search for the critical point of the quark-gluon plasma phase transition and study the onset of deconfinement in collisions of light nuclei. The results presented in this paper relate to the latter topic. Be+9 Be interactions at 40A, 75A and 150A GeV/c (preliminary), and positively charged pion spectra produced in p+p interactions at 40, 80 and 158 GeV/c (preliminary)
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