English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

In high energy heavy ion collisions a hot and dense medium is formed, wherethe U_A(1) or chiral symmetry may temporarily be restored. As a consequence,the mass of the eta'(958) mesons may be reduced to its quark model value, andthe abundance of eta' mesons at low p_T may be enhanced by more than a factorof 10. The intercept parameter lambda_* of the charged pion Bose--Einsteincorrelations provides a sensitive observable of the possibly enhanced eta'abundance. We have analyzed lambda_*(m_T) data from sqrt(s(NN))=200 GeV centralAu+Au reactions measured at the BNL Relativistic Heavy Ion Collider (RHIC),using extensive Monte Carlo simulations based on six popular models forhadronic multiplicities. Based on the combined STAR and PHENIX data set, and onvarious systematic investigations of resonance multiplicities and modelparameters, we conclude that in sqrt(s(NN))=200 GeV central Au+Au reactions themass of the eta' meson is reduced by Delta m > 200 MeV, at the 99.9% confidencelevel in the considered model class. Such a significant eta' mass modificationmay indicate the restoration of the U_A(1) symmetry in a hot and dense hadronicmatter and the return of the ninth "prodigal" Goldstone boson. A similaranalysis of NA44 S+Pb data at top CERN Super Proton Synchrotron (SPS) energiesshowed no significant in-medium eta' mass modification.

Significant in-medium eta' mass reduction in sqrt(s(NN))=200 GeV Au+Au collisions at the BNL Relativistic Heavy Ion Collider