Particle production as a function of underlying-event activity and search for jet-like modifications in pp, p-Pb, and Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with ALICE

Abstract

The similarity between small- and large-collision systems is explored using the charged-particle multiplicity in the transverse region, $N_{\mathrm{ch}}^{\mathrm{T}}$, which is sensitive to the underlying event. Measurements of charged-particle production as a function of $N_{\mathrm{ch}}^{\mathrm{T}}$ in pp, p-Pb and Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV in the toward, away and transverse regions are discussed. These three regions are defined relative to the track with the largest transverse momentum in the event ($p_{\mathrm{T}}^{\mathrm{trig}}$). The activity in the transverse region is subtracted from the activity in the toward and the away regions to search for jet-like modifications in small-collision systems. The jet-like signals are studied both as a function of $N_{\mathrm{ch}}^{\mathrm{T}}$ and $p_{\mathrm{T}}^{\mathrm{trig}}$. Results are compared with two general purpose Monte Carlo event generators: PYTHIA~8 and EPOS~LHC.

Proceedings of the XXIXth International Conference on Ultra-relativistic Nucleus-Nucleus Collisions, April 4-10, 2022, Kraków, Poland

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