Indirect observation of an in-medium η′ mass reduction in √sNN=200GeV Au+Au collisions

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Abstract

PHENIX Collaboration and STAR Collaboration data on the intercept parameter of the two-pion Bose-Einstein correlation functions in √sNN=200GeV Au+Au collisions are analyzed in terms of different models of hadronic multiplicities. To describe this combined PHENIX and STAR data set, an in-medium η′ mass reduction of at least 200 MeV is needed, 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 9th "prodigal" Goldstone boson.

Original languageEnglish
Article number182301
JournalPhysical Review Letters
Volume105
Issue number18
DOIs
Publication statusPublished - Oct 25 2010

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collisions
restoration
confidence
pions
bosons
symmetry

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

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title = "Indirect observation of an in-medium η′ mass reduction in √sNN=200GeV Au+Au collisions",
abstract = "PHENIX Collaboration and STAR Collaboration data on the intercept parameter of the two-pion Bose-Einstein correlation functions in √sNN=200GeV Au+Au collisions are analyzed in terms of different models of hadronic multiplicities. To describe this combined PHENIX and STAR data set, an in-medium η′ mass reduction of at least 200 MeV is needed, 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 9th {"}prodigal{"} Goldstone boson.",
author = "T. Cs{\"o}rgő and R. V{\'e}rtesi and J. Sziklai",
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AB - PHENIX Collaboration and STAR Collaboration data on the intercept parameter of the two-pion Bose-Einstein correlation functions in √sNN=200GeV Au+Au collisions are analyzed in terms of different models of hadronic multiplicities. To describe this combined PHENIX and STAR data set, an in-medium η′ mass reduction of at least 200 MeV is needed, 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 9th "prodigal" Goldstone boson.

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