2021/10/07 by G. Bencédi, Bencédi, Gyula, Ortiz, Antonio +2
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2110.03425
openalex publication_date 2021/10/07 · openalex created_date 2022/07/25 · openalex updated_date 2026/07/28
In this work we present the production of charged particles associated with\nhigh-p rm T trigger particles (8<p rm T rm trig.<15 GeV /c) at\nmid-pseudorapidity in proton-proton collisions at \√(s)=5.02 ,TeV\nsimulated with the \PYTHIA 8 Monte Carlo model. The study is performed\nas a function of the relative transverse activity classifier, R rm T,\nwhich is the relative charged-particle multiplicity in the transverse region\n(\π/3 <|\Δ\φ| <2\π/3) of the di-hadron correlations, and it is\nsensitive to the Multi-Parton Interactions. The evolution of the yield of\nassociated particles on both the toward and the away regions with 3\≤ p rm\nT rm assoc.<8 GeV/c as a function of R rm T is investigated. We\npropose a strategy which allows for the modelling and subtraction of the\nUnderlying Event (UE) contribution from the toward and the away regions in\nchallenging environments like those characterised by large R rm T. We\nfound that the signal in the away region becomes broader with increasing\nR rm T. Contrarily, the yield increases with R rm T in the toward\nregion. This effect is reminiscent of that seen in heavy-ion collisions, where\nan enhancement of the yield in the toward region for 0-5 % central Pb--Pb\ncollisions at \√(s) rm NN=2.76 ,TeV was reported. To further understand\nthe role of the UE and additional jet activity, the transverse region is\ndivided into two one-sided sectors, "trans-max" and "trans-min" selected in\neach event according to which region has larger or smaller charged particle\nmultiplicity. Based on this selection criterion, the observables are studied as\na function of R rm T rm max and R rm T rm min, respectively.\nThe presented results have been published in J. Phys. G 48, no.1, 015007 (2020)\nand Phys. Rev. D 104, no.1, 016017 (2021).\n