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Article
Report number arXiv:1708.08745 ; CERN-EP-2017-216
Title π0 and η meson production in proton-proton collisions at s=8 TeV
Author(s) ALICE Collaboration  Pokaż wszystkich 1026 autorów
Publication 2018-03-26
Imprint 21 Aug 2017
Number of pages 32
Note 32 pages, 8 captioned figures, 6 tables, authors from page 27, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/3716
In: Eur. Phys. J. C 78 (2018) 263
DOI 10.1140/epjc/s10052-018-5612-8
Subject category Nuclear Physics - Experiment ; nucl-ex ; hep-ex ; Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ALICE
Abstract An invariant differential cross section measurement of inclusive π0 and η meson production at mid-rapidity in pp collisions at s=8 TeV was carried out by the ALICE experiment at the LHC. The spectra of π0 and η mesons were measured in transverse momentum ranges of 0.3<pT<35 GeV/c and 0.5<pT<35 GeV/c, respectively. Next-to-leading order perturbative QCD calculations using fragmentation functions DSS14 for the π0 and AESSS for the η overestimate the cross sections of both neutral mesons, although such calculations agree with the measured η/π0 ratio within uncertainties. The results were also compared with PYTHIA 8.2 predictions for which the Monash 2013 tune yields the best agreement with the measured neutral meson spectra. The measurements confirm a universal behavior of the η/π0 ratio seen for NA27, PHENIX and ALICE data for pp collisions from s=27.5 GeV to s=8 TeV within experimental uncertainties. A relation between the π0 and η production cross sections for pp collisions at s=8 TeV is given by mT scaling for pT>3.5 GeV/c. However, a deviation from this empirical scaling rule is observed for transverse momenta below pT<3.5 GeV/c in the η/π0 ratio with a significance of 6.2σ.
Related document Supplemental figures: ALICE-PUBLIC-2017-009
Copyright/License License, CC-BY-4.0
Preprint: © 2017-2025 CERN (License: CC-BY-4.0)



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