Measurements of $\pi^-$ production in $^7$Be+$^9$Be collisions at beam momenta from 19$A$ to 150$A$GeV/$c$ in the NA61/SHINE experiment at the CERN SPS

The collaboration
Eur.Phys.J.C 80 (2020) 961, 2020.

Abstract (data abstract)
CERN-SPS. The NA61/SHINE collaboration studies at the CERN Super Proton Synchrotron (SPS) the onset of deconfinement in hadronic matter by the measurement of particle production in collisions of nuclei with various sizes at a set of energies covering the SPS energy range. This paper presents results on inclusive double-differential spectra and mean multiplicities of PI- mesons produced in the 5% most central 7Be+9Be collisions at beam momenta of 19A, 30A, 40A, 75A and 150A GeV/c obtained by the so-called h- method which does not require any particle identification. Be+Be collisions can be characterized by the energy detected in the region populated by projectile spectators. Low values of this forward energy are referred to central collision and a selection of collisions based on the forward energy is called a centrality selection. Although for Be+Be collisions the forward energy is not tightly correlated with the impact parameter of the collision, the terms central and centrality are adopted following the convention widely used in heavy-ion physics.

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Data from Figure 10 and Figure 11 without scaling

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Transverse momentum spectra of PI− in rapidity slices produced in the 5% most central Be+Be collisions at 19A GeV/c.

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Data from Figure 10 and Figure 11 without scaling

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Transverse momentum spectra of PI− in rapidity slices produced in the 5% most central Be+Be collisions at 30A GeV/c.

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Data from Figure 10 and Figure 11 without scaling

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Transverse momentum spectra of PI− in rapidity slices produced in the 5% most central Be+Be collisions at 40A GeV/c.

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Data from Figure 10 and Figure 11 without scaling

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Transverse momentum spectra of PI− in rapidity slices produced in the 5% most central Be+Be collisions at 75A GeV/c.

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Data from Figure 10 and Figure 11 without scaling

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Transverse momentum spectra of PI− in rapidity slices produced in the 5% most central Be+Be collisions at 150A GeV/c.

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Data from Figure 13 without scaling

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Transverse mass spectra 1/mT d2n/(dydmT) of negatively charged pions produced in central Be+Be collisions at the SPS energies.

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Data from Figure 15 and 16 without scaling

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Rapidity spectra of PI− produced in the 5% most central Be+Be collisions at the SPS energies.

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Data from Figure 17

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Collision energy dependence of the ratio of the width sigma_y of the rapidity distribution to the beam rapidity y_beam for...

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Data from Figure 18

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Energy dependence of the mean transverse mass of PI- measured at mid-rapidity in central Be+Be collisions.

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Data from Figure 20

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The "kink" plot showing the ratio of pion multiplicity to number of wounded nucleons versus the Fermi energy...