Transverse energy production and charged-particle multiplicity at midrapidity in various systems from sNN=7.7 to 200 GeV
2016
Measurements of midrapidity charged particle multiplicity distributions, $dN_{\rm ch}/d\eta$, and midrapidity transverse-energy distributions, $dE_T/d\eta$, are presented for a variety of
collisionsystems and energies. Included are distributions for Au$+$Au
collisionsat $\sqrt{s_{_{NN}}}=200$, 130, 62.4, 39, 27, 19.6, 14.5, and 7.7 GeV, Cu$+$Cu
collisionsat $\sqrt{s_{_{NN}}}=200$ and 62.4 GeV, Cu$+$Au
collisionsat $\sqrt{s_{_{NN}}}=200$ GeV, U$+$U
collisionsat $\sqrt{s_{_{NN}}}=193$ GeV, $d$$+$Au
collisionsat $\sqrt{s_{_{NN}}}=200$ GeV, $^{3}$He$+$Au
collisionsat $\sqrt{s_{_{NN}}}=200$ GeV, and $p$$+$$p$
collisionsat $\sqrt{s_{_{NN}}}=200$ GeV. Centrality-dependent distributions at midrapidity are presented in terms of the number of nucleon participants, $N_{\rm part}$, and the number of
constituent quarkparticipants, $N_{q{\rm p}}$. For all $A$$+$$A$
collisionsdown to $\sqrt{s_{_{NN}}}=7.7$ GeV, it is observed that the midrapidity data are better described by scaling with $N_{q{\rm p}}$ than scaling with $N_{\rm part}$. Also presented are estimates of the Bjorken energy density, $\varepsilon_{\rm BJ}$, and the ratio of $dE_T/d\eta$ to $dN_{\rm ch}/d\eta$, the latter of which is seen to be constant as a function of centrality for all systems.
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