Quark Matter 2005: Experimental Conference Summary

Tserruya, I.

doi:10.1016/j.nuclphysa.2006.06.062

Cited by 16 publications

(18 citation statements)

References 127 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is to be noted that the η ′ lifetime is much longer than the lifetime of the hot and dense medium, therefore a direct observation of the mass shift seems to be extremely difficult. [12] and NA60 data [13] indicate that the approach to a chiral symmetry restored state could proceed through resonance broadening and eventually subsequent melting, rather than by dropping masses or mass dependency or mass degeneracy between chiral partners [14]. Recent PHENIX findings also show a definite excess in the m e + e − 1 GeV dielectron invariant mass region in √ s NN = 200 GeV Au+Au collisions [15].…”

Section: Introductionmentioning

confidence: 99%

Significant in-mediumη′mass reduction insNN
Vértesi
¹
,
Csörgő
²
,
Sziklai
³

2011
Phys. Rev. C

View full text Add to dashboard Cite

In high energy heavy ion collisions a hot and dense medium is formed, where the U A (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 p T 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 * (m T ) data from √ s NN = 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 √ s NN = 200 GeV central Au+Au reactions the mass of the η ′ meson is reduced by ∆m * η ′ > 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 U A (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 Synchrotron (SPS) energies showed no significant in-medium η ′ mass modification.

show abstract

Section: Introductionmentioning

confidence: 99%

Significant in-mediumη′mass reduction insNN
Vértesi
¹
,
Csörgő
²
,
Sziklai
³

2011
Phys. Rev. C

View full text Add to dashboard Cite

show abstract

“…Recent interpretations of CERES [33] and NA60 data [34] indicate that the approach to a chiral symmetry restored state could proceed through resonance broadening and eventually subsequent melting, rather than by dropping masses or mass dependency or mass degeneracy between chiral partners [35]. Recent PHENIX findings also show a definite excess in the m e + e − 1 GeV dielectron invariant mass region in √ s NN = 200 GeV Au+Au collisions [36].…”

Section: Channels Other Than Becmentioning

confidence: 99%

In-medium reduction of theη'mass √s_NN= 200 GeV Au+Au collisions

Vértesi

Csörgő

Sziklai

2011

EPJ Web of Conferences

View full text Add to dashboard Cite

Abstract.A reduction of the mass of the η ′ (958) meson may indicate the restoration of the U A (1) symmetry in a hot and dense hadronic matter, corresponding to the return of the 9th, "prodigal" Goldstone boson. We report on an analysis of a combined PHENIX and STAR data set on the intercept parameter of the two-pion BoseEinstein correlation functions, as measuremed in √ s NN = 200 GeV Au+Au collisions at RHIC. To describe this combined PHENIX and STAR dataset, an in-medium η ′ mass reduction of at least 200 MeV is needed, at the 99.9 % confidence level in a broad model class of resonance multiplicities. Energy, system size and centrality dependence of the observed effect is also discussed.

show abstract

“…The low-energy Cherenkov gluons may be at the origin [30] of another interesting effect -the asymmetry of shapes of resonances created inside the nuclear medium. There exist numerous experimental data [40,41,29,42,43,44,45,46,47] about the in-medium modification of widths and positions of prominent vector-meson resonances. They are mostly obtained from the shapes of dilepton mass and transverse momentum spectra in nucleus-nucleus collisions.…”

Section: Asymmetry Of Shapes Of Resonances Produced Inside the Nucleamentioning

confidence: 99%

QCD in the nuclear medium and effects due to Cherenkov gluons

Dremin

2010

Phys. Atom. Nuclei

View full text Add to dashboard Cite

The equations of in-medium gluodynamics are proposed. Their classical lowest order solution is explicitly shown for a color charge moving with constant speed. For nuclear permittivity larger than 1 it describes emission of Cherenkov gluons resembling results of classical electrodynamics. The values of the real and imaginary parts of the nuclear permittivity are obtained from the fits to experimental data on the double-humped structure around the away-side jet obtained at RHIC. The dispersion of the nuclear permittivity is predicted by comparing the RHIC, SPS and cosmic ray data. This is important for LHC experiments. Cherenkov gluons may be responsible for the asymmetry of dilepton mass spectra near rho-meson, observed in the SPS experiment with excess in the low-mass wing of the resonance. This feature is predicted to be common for all resonances. The "color rainbow" quantum effect might appear according to higher order terms of in-medium QCD if the nuclear permittivity depends on color.Comment: 29 p., 4 figs; for "Phys. Atom. Nucl." volume dedicated to 80th birthday of L.B. Okun; minor corrections on pp. 11 and 13 in v

show abstract

Quark Matter 2005: Experimental Conference Summary

Cited by 16 publications

References 127 publications

Significant in-mediumη′mass reduction insNN
Vértesi
¹
,
Csörgő
²
,
Sziklai
³

2011
Phys. Rev. C

Significant in-mediumη′mass reduction insNN
Vértesi
¹
,
Csörgő
²
,
Sziklai
³

2011
Phys. Rev. C

In-medium reduction of theη'mass √s_NN= 200 GeV Au+Au collisions

QCD in the nuclear medium and effects due to Cherenkov gluons

Contact Info

Product

Resources

About

Quark Matter 2005: Experimental Conference Summary

Cited by 16 publications

References 127 publications

Significant in-mediumη′mass reduction insNN Vértesi1, Csörgő2, Sziklai3 2011Phys. Rev. C

Significant in-mediumη′mass reduction insNN Vértesi1, Csörgő2, Sziklai3 2011Phys. Rev. C

In-medium reduction of theη'mass √sNN= 200 GeV Au+Au collisions

QCD in the nuclear medium and effects due to Cherenkov gluons

Contact Info

Product

Resources

About

Significant in-mediumη′mass reduction insNN
Vértesi
¹
,
Csörgő
²
,
Sziklai
³

2011
Phys. Rev. C

Significant in-mediumη′mass reduction insNN
Vértesi
¹
,
Csörgő
²
,
Sziklai
³

2011
Phys. Rev. C

In-medium reduction of theη'mass √s_NN= 200 GeV Au+Au collisions