Understanding the p/pi ratio at LHC due to QCD mass spectrum

Autor(es)

Noronha-Hostler, Jacquelyn ^[1] ; Greiner, Carsten ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo - Brazil

^[2] Goethe Univ, Inst Theoret Phys, Frankfurt - Germany

• Tipo de documento: Artigo Científico
• Fonte: Nuclear Physics A; v. 931, p. 1108-1113, NOV 2014.
• Citações Web of Science: 17

Resumo

Thermal fits have consistently reproduced the experimental particle yields of heavy ion collisions, however, the proton to pion ratio from ALICE Pb + Pb root S-NN = 2.76 TeV is over-predicted by thermal models - known as the p/pi puzzle. Here we test the relevance of the extended mass spectrum, i.e., include Hagedorn states (resonances that follow an exponential mass spectrum and have very short life times) on the p/pi puzzle. We find that the extended mass spectrum is able to reproduce particle ratios at both RHIC and the LHC as well as is able to match the lower p/pi ratio at the LHC through dynamical chemical equilibration. (C) 2014 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 11/08361-7 - Propriedades de equilibrio e transporte da materia quente e densa criada nas colisoes nucleares de alta energia
• Beneficiário: Jacquelyn Michelle Noronha-Hostler
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado