2020/01/09 by T. A. Trainor, Trainor, Thomas A.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Nuclear Theory (nucl-th) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2001.03200
openalex publication_date 2020/01/09 · openalex created_date 2022/07/26 · openalex updated_date 2026/07/28
Identified-hadron (PID) spectra from 2.76 TeV Pb-Pb and p-p collisions\nare analyzed via a two-component (soft + hard) model (TCM) of hadron production\nin high-energy nuclear collisions. The PID TCM is adapted with minor changes\nfrom a recent analysis of PID hadron spectra from 5 TeV p-Pb collisions.\nResults from LHC data are compared with a PID TCM for 200 GeV Au-Au pion and\nproton spectra. 2.76 TeV proton spectra exhibit strong inefficiencies above 1\nGeV/c estimated by comparing the p-p spectrum with the corresponding TCM.\nAfter inefficiency correction Pb-Pb proton spectra are very similar to Au-Au\nproton spectra. PID A-A spectra are generally inconsistent with radial flow.\nJet-related Pb-Pb and Au-Au spectrum hard components exhibit strong suppression\nat higher pt in more-central collisions corresponding to results from\nspectrum ratio RAA but also, for pions and kaons, exhibit dramatic\nenhancements below pt = 1 GeV/c that are concealed by RAA. In contrast,\nenhancements of proton hard components appear only above 1 GeV/c suggesting\nthat the baryon/meson "puzzle" is a jet phenomenon. Modification of spectrum\nhard components in more-central A-A collisions is consistent with increased\ngluon splitting during jet formation but with approximate conservation of\nleading-parton energy within a jet via the lower-pt enhancements.\n