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

Jacquelyn Noronha-Hostler, Carsten Greiner

Research output: Contribution to journalArticlepeer-review


Thermal fits have consistently reproduced the experimental particle yields of heavy ion collisions, however, the proton to pion ratio from ALICE Pb. +. Pb sNN=2.76 TeV is over-predicted by thermal models - known as the p/π 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/π 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/π ratio at the LHC through dynamical chemical equilibration.

Original languageEnglish (US)
Pages (from-to)1108-1113
Number of pages6
JournalNuclear Physics A
StatePublished - Nov 1 2014
Externally publishedYes


  • Dynamical hadronic interactions
  • Extended mass spectrum
  • Hadron resonance gas
  • Hagedorn states
  • Relativistic heavy-ion collisions
  • Thermal fits

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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