The onset of jet quenching phenomenon

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Physics Department

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Physics Department

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Mohamed T. AlFiky; O. Elsherif; Ahmad M. Hamed

Document Type

Research Article

Publication Title

JETP Letters

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The aim of this study is to set a baseline for the jet quenching measurements of the Quark Gluon Plasma 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 sNN−−−−√=200GeVsNN=200GeV and sNN−−−−√=13TeVsNN=13TeV corresponding to the available energies at the current collider experiments; the Relativistic Heavy Ion Collider, and the Large Hadron Collider. At both energies, the two-particle azimuthal correlation functions have been considered, and the yield associated with the high transverse momentum (pT) particles were extracted at its near-side (Δϕ ≈ 0) and away-side (Δϕ ≈ π) at mid pseudo rapidity (|η| ≤ 2). The ratio between the near-side yields in the high multiplicity events to these of the low multiplicity events (INHL), as well as, the ratio of the away-side yields (INHL) were calculated at both energies as a function of the hadron fractional energy zT of the high-pT particle. At both energies, the values of INHL and IAHL were less than unity, and of trivial dependence on zT. The values of IAHL are always less than these of INHL 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-pT particle.

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