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Investigating jet-induced identified hadron production from the relative transverse activity classifier in pp collisions at the LHC

Yuhao Peng1, Yan Wu1, Xinye Peng1,2, Zhongbao Yin2, and Liang Zheng1,3,2,*

  • *Contact author: zhengliang@cug.edu.cn
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Phys. Rev. D 112, 114010 – Published 3 December, 2025

DOI: https://doi.org/10.1103/bm5b-829j

Abstract

In this work, we systematically investigate the jet associated identified hadron productions of pions, kaons, and protons based on the event topological separation method in proton-proton (pp) collisions at s=13  TeV employing a multiphase transport model with pythia8 initial conditions. Enabling relative transverse event activity classifier RT, we analyze the transverse momentum (pT) spectra and particle ratios in the jet aligned toward region and the underlying event contributions sensitive transverse region varying with RT. The results indicate that a multi-phase transport model, incorporating both partonic and hadronic final-state interactions, provides a satisfactory description to the experimental data of the pT differential yields, particle ratios, and average transverse momentum of identified particles in both the toward and transverse regions across different event activity classes. By subtracting the underlying event contribution from the toward region using the transverse region hadron yield, we introduce the in-jet hadron productions to analyze the modifications to the jet itself. We find that the in-jet baryon to meson ratios reveal a sensitive dependence on RT driven by final-state interactions, leading to a unique crossing pattern at intermediate pT. This behavior can be regarded as a novel signature for probing jet medium interactions and energy loss effects in small collision systems.

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Phys. Rev. D 112, 114010– Published 3 December, 2025
  • Received 2 August 2025
  • Accepted 12 November 2025
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