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Undersaturation of quarks at early stages of relativistic nuclear collisions: the hot glue initial scenario and its observable signatures
Preprint
H. Stoecker ,
M. Beitel ,
T. S. Biró ,
L. P. Csernai ,
K. Gallmeister ,
M. I. Gorenstein ,
C. Greiner ,
I. N. Mishustin ,
M. Panero ,
S. Raha ,
L. M. Satarov ,
S. Schramm ,
F. Senzel ,
B. Sinha ,
J. Steinheimer ,
J. Struckmeier ,
V. Vovchenko ,
Z. Xu ,
K. Zhou ,
P. Zhuang
2015-09-25
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Abstract
The early stage of high multiplicity nuclear collisions is represented by a nearly quarkless, hot, deconfined pure gluon plasma. This new scenario should be characterized by a suppression of high \(p_T\) photons and dileptons as well as by reduced baryon to meson ratios. We present the numerical results for central Pb+Pb collisions at the LHC energies by using the ideal Bjorken hydrodynamics with time-dependent quark fugacity. It is shown that about 25\% of final total entropy is generated during the hydrodynamic evolution of chemically undersaturated quark-gluon plasma.