Undersaturation of quarks at early stages of relativistic nuclear collisions: the hot glue initial scenario and its observable signatures

17 Nov 2015 · Stoecker H., Beitel M., Biró T. S., Csernai L. P., Gallmeister K., Gorenstein M. I., Greiner C., Mishustin I. N., Panero M., Raha S., Satarov L. M., Schramm S., Senzel F., Sinha B., Steinheimer J., Struckmeier J., Vovchenko V., Xu Z., Zhou K., Zhuang P. ·

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.

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Undersaturation of quarks at early stages of relativistic nuclear collisions: the hot glue initial scenario and its observable signatures

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