TEEC and azimuthal correlations in forward γ-hadron production in proton-proton and proton-lead collisions at LHC

2025/07/31 by Ishita Ganguli, Ganguli, Ishita, Piotr Kotko +1
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.2507.23435

openalex publication_date 2025/07/31 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We investigate photon-hadron Transverse Energy-Energy Correlation (TEEC) and azimuthal correlations in the forward rapidity region for proton-proton and proton-lead collisions within the small x saturation formalism based on the Color Glass Condensate (CGC), supplemented by the initial-state and final-state parton shower simulation and hadronization using CASCADE. The study was performed in light of the upcoming FoCal detector of ALICE and the ATLAS detector upgrades with the extended pseudorapidity coverage. We predict a significant difference, at hadron-level, between the normalized TEECs in proton-proton and proton-lead collisions. Having a direct access to partonic subprocesses we also directly investigate the impact of the parton shower and hadronization on the TEEC. The ordinary azimuthal γ-hadron correlations show substantial suppression for proton-lead collision, as predicted earlier at parton-level.

Citations

• Physics with high-luminosity proton-nucleus collisions at the LHC
• Transverse Energy--Energy Correlators at Small x for Photon--Hadron Production
• Measurement of isolated prompt photon production in pp and p-Pb collisions at the LHC
• The Transverse Energy-Energy Correlator at Next-to-Next-to-Next-to-Leading Logarithm
• Parton shower algorithm with saturation effect
• Revealing a deep connection between factorization and saturation: New insight into modeling high-energy proton-proton and nucleus-nucleus scattering in the EPOS4 framework
• Energy-Energy Correlators for Precision QCD
• A study on the isolated photon production in nuclear collisions at the CERN-LHC energies
• Conformal collider physics: energy and charge correlations

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