Light neutral-meson production in pp collisions at root s=13 TeV
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F25%3A00388349" target="_blank" >RIV/68407700:21340/25:00388349 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1007/JHEP08(2025)035" target="_blank" >https://doi.org/10.1007/JHEP08(2025)035</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/JHEP08(2025)035" target="_blank" >10.1007/JHEP08(2025)035</a>
Alternative languages
Result language
angličtina
Original language name
Light neutral-meson production in pp collisions at root s=13 TeV
Original language description
The momentum-differential invariant cross sections of pi(0) and eta mesons are reported for pp collisions at root s = 13 TeV at midrapidity (vertical bar y vertical bar < 0.8). The measurement is performed in a broad transverse-momentum range of 0.2 < p(T) < 200 GeV/c and 0.4 < p(T) < 60 GeV/c for the pi(0) and eta, respectively, extending the p(T) 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 (x(T)) scaling of the pi(0) 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 are compared to predictions from next-to-leading order perturbative QCD calculations, where the pi(0) 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 pi(0) and are not able to describe the shape and magnitude of the eta spectrum. The charged-particle multiplicity dependent pi(0) and eta p(T) spectra show the expected change of the spectral shape, characterized by a flatter slope 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 eta/pi(0) ratio depends on the charged-particle multiplicity for p(T) < 4 GeV/c. PYTHIA8 and EPOS LHC qualitatively explain this behavior with an increasing contribution from the feed-down of heavier particles to the pi(0) spectrum.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10303 - Particles and field physics
Result continuities
Project
<a href="/en/project/LM2023040" target="_blank" >LM2023040: Research infrastructure for experiments at CERN</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of High Energy Physics
ISSN
1029-8479
e-ISSN
1029-8479
Volume of the periodical
2025
Issue of the periodical within the volume
8
Country of publishing house
IT - ITALY
Number of pages
46
Pages from-to
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UT code for WoS article
001573204100001
EID of the result in the Scopus database
2-s2.0-105017920249