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Preprint
Report number arXiv:2411.09560 ; CERN-EP-2024-304
Title Light neutral-meson production in pp collisions at s = 13 TeV
Author(s) Acharya, Shreyasi (Clermont-Ferrand U.) ; Agarwal, Apar (Calcutta, VECC) ; Aglieri Rinella, Gianluca (CERN) ; Aglietta, Luca (Turin U. ; INFN, Turin) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (Bologna U. ; INFN, Bologna) ; Ahammed, Zubayer (Calcutta, VECC) ; Ahmad, Shakeel (Aligarh Muslim U.) ; Ahn, Sang Un (KISTI, Daejeon) ; Ahuja, Ishaan (Kosice U.) Afficher les 1072 auteurs
Corporate author(s) The ALICE collaboration
Publication 2024
Imprint 13 Nov 2024
Number of pages 39
Note 39 pages, 13 captioned figures, 9 tables, authors from page 33, submitted to JHEP, figures at http://alice-publications.web.cern.ch/node/11738
Subject category Nuclear Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ALICE
Keywords QCD ; relativistic heavy ion physics ; quark gluon plasma ; hard scattering ; particle and resonance production ; experimental results
Abstract The momentum-differential invariant cross sections of π0 and η mesons are reported for pp collisions at s=13 TeV at midrapidity (|y|<0.8). The measurement is performed in a broad transverse-momentum range of 0.2<pT<200 GeV/c and 0.4<pT<60 GeV/c for the π0 and η, respectively, extending the pT coverage of previous measurements. Transverse-mass-scaling violation of up to 60% at low transverse momentum has been observed, agreeing with measurements at lower collision energies. Transverse Bjorken x (xT) scaling of the π0 cross sections at LHC energies is fulfilled with a power-law exponent of n = 5.01 ± 0.05, consistent with values obtained for charged pions at similar collision energies. The data is compared to predictions from next-to-leading order perturbative QCD calculations, where the π0 spectrum is best described using the CT18 parton distribution function and the NNFF1.0 or BDSS fragmentation function. Expectations from PYTHIA8 and EPOS LHC overestimate the spectrum for the π0 and are not able to describe the shape and magnitude of the η spectrum. The charged-particle multiplicity dependent π0 and η pT spectra show the expected hardening with increasing multiplicity. This is demonstrated across a broad transverse-momentum range and up to events with a charged-particle multiplicity exceeding five times the mean value in minimum bias collisions. The absolute magnitude of the η/π0 ratio shows a dependence on the charged-particle multiplicity for pT<4 GeV/c, qualitatively described by PYTHIA8 and EPOS LHC due to a rising contribution from feed-down of heavier particles to the π0 spectrum.
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Copyright/License Preprint: © 2024-2025 CERN (License: CC-BY-4.0)
Submitted by zaida.conesa.del.valle@cern.ch



 


 Notice créée le 2024-11-13, modifiée le 2024-12-20


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