Constraining the hadronic spectrum through QCD thermodynamics on the lattice

Paolo Alba, Rene Bellwied, Szabolcs Borsányi, Zoltan Fodor, Jana Günther, Sandor D. Katz, Valentina Mantovani Sarti, Jacquelyn Noronha-Hostler, Paolo Parotto, Attila Pasztor, Israel Portillo Vazquez, Claudia Ratti

Research output: Contribution to journalArticlepeer-review


Fluctuations of conserved charges allow us to study the chemical composition of hadronic matter. A comparison between lattice simulations and the hadron resonance gas (HRG) model suggested the existence of missing strange resonances. To clarify this issue we calculate the partial pressures of mesons and baryons with different strangeness quantum numbers using lattice simulations in the confined phase of QCD. In order to make this calculation feasible, we perform simulations at imaginary strangeness chemical potentials. We systematically study the effect of different hadronic spectra on thermodynamic observables in the HRG model and compare to lattice QCD results. We show that, for each hadronic sector, the well-established states are not enough in order to have agreement with the lattice results. Additional states, either listed in the Particle Data Group booklet (PDG) but not well established, or predicted by the quark model (QM), are necessary in order to reproduce the lattice data. For mesons, it appears that the PDG and the quark model do not list enough strange mesons, or that, in this sector, interactions beyond those included in the HRG model are needed to reproduce the lattice QCD results.

Original languageEnglish (US)
Article number034517
JournalPhysical Review D
Issue number3
StatePublished - Aug 1 2017
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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