Centrality and pseudorapidity dependence of the charged-particle multiplicity density in Xe-Xe collisions at root s(NN)=5.44 TeV
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Abstract
In this Letter, the ALICE Collaboration presents the first measurements
of the charged-particle multiplicity density, dN(ch)/d eta, and total
charged-particle multiplicity, N-ch(tot), in Xe-Xe collisions at a
centre-of-mass energy per nucleon-nucleon pair of root s(NN) = 5.44 TeV.
The measurements are performed as a function of collision centrality
over a wide pseudorapidity range of -3.5 < eta < 5. The values of
dN(ch)/d eta at mid-rapidity and N-ch(tot) for central collisions,
normalised to thhe number of nucleons participating in the collision
(N-part) as a function of root s(NN) follow the trends established in
previous heavy-ion measurements. The same quantities are also found to
increase as a function of N-part, and up to the 5\% most central
collisions the trends are the same as the ones observed in Pb-Pb at a
similar energy. For more central collisions, the Xe-Xe scaled
multiplicities exceed those in Pb-Pb for a similar N-part. The results
are compared to phenomenological models and theoretical calculations
based on different mechanisms for particle production in nuclear
collisions. All considered models describe the data reasonably well
within 15\%. (C) 2018 Published by Elsevier B.V.... Show more Show less