Abstract
Hadron production in relativistic heavy-ion collisions at LHC energies is investigated. After a brief consideration of stopping, particle production is accounted for in a nonequilibrium-statistical model with two fragmentation sources, and a central source that is mostly due to low-x gluon-gluon collisions. The particle content and energy dependence of the three sources is discussed for AuAu (RHIC) and PbPb (LHC). Results for asymmetric pPb collisions are compared with ALICE and preliminary ATLAS data. The suppression of ϒ-mesons in the hot quark-gluon medium in PbPb collisions as compared to pp at √sNN = 2.76 TeV is accounted for in a model that encompasses gluodissociation, collisional damping, screening, and reduced feed-down. Results are compared with CMS and ALICE data.
Highlights
A brief survey of several features of hadron production in relativistic heavy-ion collisions at LHC energies is given in this article, which is essentially based on results published in [1], and obtained in [2, 3] for charged-hadron production, and in the references cited in the text for bottomia suppression in PbPb collisions at LHC energies
When considering rapidity or pseudorapidity distributions of produced charged particles, the fragmentation distributions play a significant role, but since they shift to large values of rapidity at LHC, particle production near mid rapidity is almost exclusively determined by the central low-x gluon-gluon source
The suppression of the strongly bound Υ(1S ) spin-triplet ground state in PbPb collisions at LHC energies as compared to scaled pp collisions at the same energy is a sensitive indicator for the properties of the quark-gluon plasma that causes gluodissociation and damping
Summary
A brief survey of several features of hadron production in relativistic heavy-ion collisions at LHC energies is given in this article, which is essentially based on results published in [1], and obtained in [2, 3] for charged-hadron production, and in the references cited in the text for bottomia suppression in PbPb collisions at LHC energies. When considering rapidity or pseudorapidity distributions of produced charged particles, the fragmentation distributions play a significant role, but since they shift to large values of rapidity at LHC, particle production near mid rapidity is almost exclusively determined by the central low-x gluon-gluon source. This source cancels out in net-proton distributions, but in charged-hadron distributions its importance rises strongly with incident energy.
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