2002/07/31 by Sangyong Jeon, S. Jeon, J. Jalilian-Marian +3 · 4 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph #nucl-th
paper · pdf · doi:10.1016/s0375-9474(03)01447-7
published as Nucl.Phys. A723 (2003) 467-482 · minor corrections, version accepted for publication in Nuclear Physics A
arxiv created 2003/04/30 · openalex publication_date 2003/05/19 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/29
We present results for the large-pT inclusive π0 production in p-p and A-A collisions at RHIC and LHC energies. We include the full next-to-leading order radiative corrections, O(αs3), and nuclear effects such as parton energy loss and nuclear shadowing. We find the next-to-leading order corrections and the parton energy loss effect to be large and pT dependent, while the nuclear shadowing effects are small (< 10%). We calculate the ratio of prompt photons to neutral pions produced in heavy ion collisions and show that at RHIC energies this ratio increases with pT approaching one at pT ∼ 8 GeV, due to the large suppression of π0 production. We show that at the LHC, this ratio has a steep pT dependence and approaches 25% effect at pT ∼ 40 GeV. We discuss theoretical uncertainties inherent in our calculation, such as choice of the renormalization, factorization and fragmentation scales and the K-factors which signify the size of higher-order corrections.