Hadrons from coalescence plus fragmentation in AA collisions at energies available at the BNL Relativistic Heavy Ion Collider to the CERN Large Hadron Collider

Vincenzo Minissale, Francesco Scardina, and Vincenzo Greco
Phys. Rev. C 92, 054904 – Published 9 November 2015

Abstract

In a coalescence plus independent fragmentation approach we calculate the pT spectra of the main hadrons: π,K,p,p¯,Λ,ϕ in a wide range of transverse momentum from low pT up to about 10 GeV. The approach in its main features was developed several years ago at Relativistic Heavy Ion Collider (RHIC) energy. Augmenting the model with the inclusion of some more main resonance decays, we show that the approach correctly predicts the evolution of the pT spectra from RHIC to LHC (Large Hadron Collider) energy and in particular the baryon-to-meson ratios p/π,p¯/π,Λ/K that reach a value of the order of unit at pT3GeV. This is achieved without any change of the coalescence parameters. The more recent availability of experimental data up to pT10GeV for Λ spectrum as well as for p/π and Λ/K shows some lack of yield in a limited pT range around 6 GeV. This indicates that the baryons pT spectra from Albino-Kniehl-Kramer fragmentation functions are too flat at pT8GeV. We also show that in a coalescence plus fragmentation approach one predicts a nearly pT independent p/ϕ ratio up to pT4GeV followed by a significant decrease at higher pT. Such a behavior is driven by a similar radial flow effect at pT<2GeV and the dominance of fragmentation for ϕ at larger pT.

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  • Received 19 March 2015

DOI:https://doi.org/10.1103/PhysRevC.92.054904

©2015 American Physical Society

Authors & Affiliations

Vincenzo Minissale, Francesco Scardina, and Vincenzo Greco

  • Dipartimento di Fisica e Astronomia, University of Catania, Via S. Sofia 62, I-95123 Catania, Italy and INFN-LNS, Laboratori Nazionali del Sud, Via S. Sofia 64, I-95123 Catania, Italy

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Issue

Vol. 92, Iss. 5 — November 2015

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