Universal centrality dependence of particle multiplicities in heavy-ion collisions

• Verfasst von: Pirner, Hans J. [VerfasserIn]
• Verfasst von: Reygers, Klaus [VerfasserIn]
• Verfasst von: Kopeliovich, Boris Z. [VerfasserIn]
• Titel: Universal centrality dependence of particle multiplicities in heavy-ion collisions
• Verf.angabe: H.J. Pirner, K. Reygers, B.Z. Kopeliovich
• E-Jahr: 2013
• Jahr: 15 May 2013
• Umfang: 9 S.
• Fussnoten: Gesehen am 24.11.2021
• Titel Quelle: Enthalten in: Physical review / C
• Ort Quelle: Woodbury, NY : Inst., 1970
• Jahr Quelle: 2013
• Band/Heft Quelle: 87(2013), 5 vom: Mai, Artikel-ID 054906, Seite 1-9
• ISSN Quelle: 1089-490X
• DOI: doi:10.1103/PhysRevC.87.054906
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 177893076X

Abstract

Starting from the light-cone plasma (LCP) distribution of gluons produced in proton-proton collisions, we derive the invariant charged-particle yield dN/dyd2p⊥ in heavy-ion collisions. Multiple scattering of partons in the other nucleus leads to p⊥ broadening, which depends on the centrality of the collision. The resulting change of the LCP parameters determines the distributions of charged particles. The charged-particle multiplicity dN/dη at η=0 normalized to the number of participating nucleons has a universal centrality dependence, common to the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC). This universal increase is of geometrical origin. Such a universality can be broken by the energy-dependent coherence effect, shadowing, and mutual boosting of the saturation scales. However, we found these effects to essentially compensate each other, leaving the centrality dependence of multiplicity approximately universal.