PoS - Proceedings of Science
Volume 397 - The Ninth Annual Conference on Large Hadron Collider Physics (LHCP2021) - Poster Session
Particle production as a function of the underlying event in pp collisions simulated with PYTHIA 8
G. Bencedi*, A. Ortiz and A. Paz
Full text: pdf
Pre-published on: October 20, 2021
Published on: November 17, 2021
In this work we present the production of charged particles associated with high-푝T trigger particles (8 < 푝trig.
T < 15 GeV /푐) at mid-pseudorapidity in proton-proton collisions at √푠 = 5.02 TeV simulated with the PYTHIA 8 Monte Carlo model. The study is performed as a function of the relative transverse activity classifier, 푅T, which is the relative charged-particle multiplicity in the transverse region (휋/3 < |Δ휙| < 2휋/3) of the di-hadron correlations, and it is sensitive to the Multi-Parton Interactions. The evolution of the yield of associated particles on both the toward and the away regions with 3 ≤ 푝assoc.T < 8 GeV/푐 as a function of 푅T is investigated. We propose a strategy which allows for the modelling and subtraction of the Underlying Event (UE) contribution from the toward and the away regions in challenging environments like those characterised by large 푅T. We found that the signal in the away region becomes broader with increasing 푅T.
Contrarily, the yield increases with 푅T in the toward region. This effect is reminiscent of that seen in heavy-ion collisions, where an enhancement of the yield in the toward region for 0 −5% central Pb–Pb collisions at √푠NN = 2.76 TeV was reported. To further understand the role of the UE and additional jet activity, the transverse region is divided into two one-sided sectors, “trans-max” and “trans-min” selected in each event according to which region has larger or smaller charged particle multiplicity. Based on this selection criterion, the observables are studied as a function of 푅maxT and 푅minT , respectively. The presented results have been published in Refs. [1, 2].
DOI: https://doi.org/10.22323/1.397.0234
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