Particle production as a function of underlying-event activity and very forward energy with ALICE

Abstract

Measurements of charged-particle production in pp and p-Pb collisions at ${\sqrt{s}}_{\mathrm{NN}}=5.02$ TeV in the toward, away and transverse regions are discussed. These three regions are defined event by event relative to the track with the largest transverse momentum ($p_{\mathrm{T}}^{\mathrm{trig}}$). The transverse region is sensitive to the underlying event (UE), but it also includes contributions from initial- and final-state radiation (ISR-FSR). Therefore, it is further subdivided in two regions, defined according to their relative multiplicity: trans-max (the sub-transverse region with the largest multiplicity) and trans-min (the sub-transverse region with the smallest multiplicity) regions which are sensitive to UE and ISR-FSR, respectively. KNO-like scaling properties are explored in the three defined transverse regions. Finally, the relationship between $p_{\mathrm{T}}^{\mathrm{trig}}$ and the energy detected in a region close to beam rapidity (very forward energy) is reported.

4 pages, 5 figures, proceeding of the 20th International Conference on Strangeness in Quark Matter (2022), Busan, Republic of Korea

References in corpus (5)

• Universality of the underlying event in pp collisions
• Underlying Event properties in pp collisions at $\sqrt{s}$ = 13 TeV
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• Energy dependence of underlying-event observables from RHIC to LHC energies