Influence of modified light-flavor hadron spectra on particle yields in the statistical hadronization model

A. Andronic , P. Braun-Munzinger , D. Gündüz , Y. Kirchhoff , M.K. Köhler , J. Stachel , M. Winn (1)

1 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers

Hadron production in relativistic nuclear collisions is well described in the framework of the Statistical Hadronization Model (SHM). We investigate the influence on SHM predictions of hadron mass spectra for light-flavor baryons and mesons modified by the addition of about 500 new states as predicted by lattice QCD and a relativistic quark model. The deterioration of the resulting thermodynamic fit quality obtained for Pb–Pb collision data at sNN=2.76 TeV suggests that the additional states are not suited to be naively used since also interactions among the states as well as non-resonant contributions need to be considered in the SHM approach. Incorporating these effects via the pion nucleon interaction determined from measured phase shifts leads again to excellent reproduction of the experimental data. This is a strong indication that at least the additional nucleon excited states cannot be understood and used as independent resonances.

Mots clés: Relativistic nuclear collisions; Statistical hadronization model; Hadron yields PbPb collisions LHC; hadronization: statistical; hadronization: model; nucleon: interaction; nucleus nucleus: scattering; quark model: relativistic; hadron: mass spectrum; hadron: production; particle: yield; lattice field theory; hadron spectroscopy; thermodynamical; excited state; phase shift; 2760 GeV-cms/nucleon

Domaines: Physique Nucléaire Théorique [nucl-th]; Physique des Hautes Energies - Réseau [hep-lat]; Physique des Hautes Energies - Phénoménologie [hep-ph]; Physique Nucléaire Expérimentale [nucl-ex]

A. Andronic, P. Braun-Munzinger, D. Gündüz, Y. Kirchhoff, M.K. Köhler, et al.. Influence of modified light-flavor hadron spectra on particle yields in the statistical hadronization model. Nucl.Phys.A, 2021, 1010, pp.122176. ⟨10.1016/j.nuclphysa.2021.122176⟩. ⟨hal-03022760⟩