2020/09/07 by Nicolas Schmidt, Schmidt, Nicolas
Physics and Astronomy · #FOS: Physical sciences #High-Energy Particle Collisions Research #Nuclear Experiment (nucl-ex) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #nucl-ex
paper · pdf · doi:10.48550/arxiv.2009.03100
Proceedings of the 10th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions, Hard Probes 2020
arxiv created 2020/09/07 · openalex publication_date 2020/09/07 · arxiv updated 2020/09/08 · openalex created_date 2022/07/25 · openalex updated_date 2026/07/28
Light neutral meson differential invariant cross section and nuclear modification factor measurements have been carried out with the ALICE detector at the CERN LHC in pp collisions at √(s)=8 TeV and p--Pb collisions at √(sNN)=8.16 TeV. The analysis combines results from several partially independent reconstruction techniques where the π0 and η meson decay photons were detected with the electromagnetic calorimeter, EMCal, the photon spectrometer, PHOS, or via reconstruction of e+e- pairs from conversions in the ALICE detector material using the central tracking system. The neutral pion measurement reaching a pT of 200 GeV/c poses as the highest measured identified particle spectrum to date while the η meson is measured to an unprecedented pT of 50 GeV/c. The spectra are found to be generally overestimated by NLO pQCD calculations. The nuclear modification factors of both mesons exhibit a suppression for pT<10 GeV/c which is stronger compared to previous measurements at √(sNN)=5.02 TeV and consistent with CGC and cold nuclear matter energy loss calculations. For pT>10 GeV/c, RpPb is consistent with unity and theory predictions.