The Onset of Jet Quenching Phenomenon

Abstract

The aim of this study is to set a baseline for the jet quenching measurements of the Quark Gluon Plasma (QGP) formed in the large system size Nucleus-Nucleus (A-A) at top central collisions, via studying simulated small system size, Nucleon-Nucleon (N-N) collisions. The proton-proton (p-p) collisions were simulated using PYTHIA, at center of mass energies $\sqrt{s_{{}_{NN}}}=200$ $GeV$ and $\sqrt{s_{{}_{NN}}}=13$ $TeV$ corresponding to the available energies at the current collider experiments; the Relativistic Heavy Ion Collider (RHIC), and the Large Hadron Collider (LHC). At both energies, the two-particle azimuthal correlation functions have been considered, and the yield associated with the high transverse momentum ($p_{{}_T}$) particles were extracted at its near-side ($\Delta \varphi \approx 0$) and away-side ($\Delta \varphi \approx \pi$) at mid pseudo rapidity ($|\eta |\le 2$). The ratio between the near-side yields in the high multiplicity events to these of the low multiplicity events ($I_{{}_{HL}}^{{}^N}$), as well as, the ratio of the away-side yields ($I_{{}_{HL}}^{{}^A}$) were calculated at both energies as a function of the hadron fractional energy $z_{{}_T}$ of the high-$p_{{}_T}$ particle. At both energies, the values of $I_{{}_{HL}}^{{}^N}$ and $I_{{}_{HL}}^{{}^A}$ were less than unity, and of trivial dependence on $z_{{}_T}$. The values of $I_{{}_{HL}}^{{}^A}$ are always less than these of $I_{{}_{HL}}^{{}^N}$ at the same multiplicity and energy, and both quantities show a pattern of systematic decreases with the multiplicity. Such multiplicity dependence cannot be used neither to exclude the jet quenching nor to prove it in the high multiplicity events in p-p collisions, as the suppressions have been found at both sides, near and away of the high-$p_{{}_T}$ particle.

arXiv comment11 pages, 10 figures, comments welcome. This paper supersedes arXiv:1902.05114 by the same authors because it has been significantly rewritten

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