Significant in-medium η mass reduction in √sNN=200 GeV Au+Au collisions at the BNL Relativistic Heavy Ion Collider

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Abstract

In high-energy heavy ion collisions a hot and dense medium is formed, where the UA(1) or chiral symmetry may temporarily be restored. As a consequence, the mass of the η(958) mesons may be reduced to its quark model value, and the abundance of η mesons at low pT may be enhanced by more than a factor of 10. The intercept parameter λ* of the charged pion Bose Einstein correlations provides a sensitive observable of the possibly enhanced η abundance. We have analyzed λ *(mT) data from √sNN=200 GeV central Au+Au reactions measured at the BNL Relativistic Heavy Ion Collider (RHIC), using extensive Monte Carlo simulations based on six popular models for hadronic multiplicities. Based on the combined STAR and PHENIX data set, and on various systematic investigations of resonance multiplicities and model parameters, we conclude that in √sNN=200 GeV central Au+Au reactions the mass of the η meson is reduced by Δmη*>200 MeV, at the 99.9% confidence level in the considered model class. Such a significant η mass modification may indicate the restoration of the UA(1) symmetry in a hot and dense hadronic matter and the return of the ninth "prodigal" Goldstone boson. A similar analysis of NA44 S+Pb data at top CERN Super Proton Synchroton (SPS) energies showed no significant in-medium η mass modification.

Original languageEnglish
Article number054903
JournalPhysical Review C - Nuclear Physics
Volume83
Issue number5
DOIs
Publication statusPublished - May 6 2011

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heavy ions
collisions
mesons
symmetry
proton energy
quark models
ionic collisions
restoration
confidence
pions
bosons
simulation
energy

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

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title = "Significant in-medium η′ mass reduction in √sNN=200 GeV Au+Au collisions at the BNL Relativistic Heavy Ion Collider",
abstract = "In high-energy heavy ion collisions a hot and dense medium is formed, where the UA(1) or chiral symmetry may temporarily be restored. As a consequence, the mass of the η′(958) mesons may be reduced to its quark model value, and the abundance of η′ mesons at low pT may be enhanced by more than a factor of 10. The intercept parameter λ* of the charged pion Bose Einstein correlations provides a sensitive observable of the possibly enhanced η′ abundance. We have analyzed λ *(mT) data from √sNN=200 GeV central Au+Au reactions measured at the BNL Relativistic Heavy Ion Collider (RHIC), using extensive Monte Carlo simulations based on six popular models for hadronic multiplicities. Based on the combined STAR and PHENIX data set, and on various systematic investigations of resonance multiplicities and model parameters, we conclude that in √sNN=200 GeV central Au+Au reactions the mass of the η′ meson is reduced by Δmη′*>200 MeV, at the 99.9{\%} confidence level in the considered model class. Such a significant η′ mass modification may indicate the restoration of the UA(1) symmetry in a hot and dense hadronic matter and the return of the ninth {"}prodigal{"} Goldstone boson. A similar analysis of NA44 S+Pb data at top CERN Super Proton Synchroton (SPS) energies showed no significant in-medium η ′ mass modification.",
author = "R. V{\'e}rtesi and T. Cs{\"o}rgő and J. Sziklai",
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