Ridge from jet-medium interaction in $p$-Pb collisions at $\sqrt{s_{\mathit{N}N}}=5.02$ TeV

In this paper we report the effect of the jet-medium interplay as implemented in the EPOS 3 model on the ridgelike structure observed in high-multiplicity $p$-Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV. EPOS 3 takes into account hydrodynamically expanding bulk matter, jets and the jet-medium interaction. The basis of this model is multiple scatterings where each scattering finally produces flux tubes (strings). In the higher multiplicity event classes where the density of flux-tubes (strings) is higher, there is a finite probability that the strings will pick up quarks and antiquarks (or diquarks) from the bulk (core) for flux-tube breaking to produce jet hadrons (corona) instead of producing them via the usual Schwinger mechanism. This will eventually create a correlation between core and corona and also influence the corona-corona correlation because the corona particles containing quarks and antiquarks (or diquarks) from the bulk also carry the fluid information. We report the relative contributions of the core-core, core-corona, corona-core, and corona-corona correlations toward the ridge in high- and low-multiplicity $p$-Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV using the data generated by EPOS 3. The multiplicity evolution of the ridges in all the cases is also reported.

Figure 1

Two-particle $\mathrm{\Delta }\eta$-$\mathrm{\Delta }\varphi$ correlation functions in the 0–20% event class of $p$-Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV from EPOS 3 for (a) core-core, (b) core-corona, (c) corona-core, and (d) corona-corona correlations.

Figure 2

Multiplicity dependence of the near-side ridge (pedestal subtracted) obtained from (a) core-core, (b) core-corona, (c) corona-core, and (d) corona-corona correlations. In each case ridges from 0–20% and 60–100% event classes have been compared.

Figure 3

Two-particle $\mathrm{\Delta }\eta$-$\mathrm{\Delta }\varphi$ correlation function in the 0–20% event class of $p$-Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV from EPOS 3 considering all particles from core and corona.

Figure 4

Relative contribution of ridges from different origins toward the total ridge in the 0–20% event class of $p$-Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV.

Figure 5

Relative contribution of ridges from different origins toward the total ridge in the 60–100% event class of $p$-Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV.