J/Ψ PRODUCTION IN HIGH ENERGY PARTICLE AND NUCLEAR COLLISIONS: SUPPRESSED, ENHANCED, OR JUST NORMAL?

2005 ◽  
Vol 20 (20n21) ◽  
pp. 5037-5058 ◽  
Author(s):  
P. GUPTAROY ◽  
GOURI SANYAL ◽  
BHASKAR DE ◽  
S. BHATTACHARYYA

The oncoming recent data on production of J/Ψ mesons in some high energy particle and nuclear collisions are of special importance in view of the controversies centering around the so-called suppression or enhancement mechanisms for this particle-species. We will try to explain here the features of some of the basic observables on J/Ψ production with the help of an approach which has no direct links with quark–gluon plasma (QGP) considerations, but can interpret a large amount of data related to the proposed physical signatures of QGP. The final outcome, based on the present study, amounts to stating the fact that the J/Ψ production is neither suppressed nor enhanced; rather it exhibits both in our theoretical approach and also in the experimental measurements a behavior which is just as normal as many other secondaries, with only specificities of its own intrinsic quantum numbers and the very massive nature.

2013 ◽  
Vol 28 (27) ◽  
pp. 1330043 ◽  
Author(s):  
HELMUT SATZ

The ultimate aim of high energy heavy ion collisions is to study quark deconfinement and the quark–gluon plasma predicted by quantum chromodynamics. This requires the identification of observables calculable in QCD and measurable in heavy ion collisions. I concentrate on three such phenomena, related to specific features of strongly interacting matter. The observed pattern of hadrosynthesis corresponds to that of an ideal resonance gas in equilibrium at the pseudo-critical temperature determined in QCD. The critical behavior of QCD is encoded in the fluctuation patterns of conserved quantum numbers, which are presently being measured. The temperature of the quark–gluon plasma can be determined by the dissociation patterns of the different quarkonium states, now under study at the LHC for both charmonia and bottomonia.


Author(s):  
Minoru Biyajima ◽  
Hideto Enyo ◽  
Teiji Kunihiro ◽  
Osamu Miyamura

2009 ◽  
Vol 830 (1-4) ◽  
pp. 443c-446c ◽  
Author(s):  
Hanzhong Zhang ◽  
J.F. Owens ◽  
Enke Wang ◽  
Xin-Nian Wang

1995 ◽  
Vol 52 (5) ◽  
pp. 2725-2732 ◽  
Author(s):  
Joseph I. Kapusta ◽  
Axel P. Vischer

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