A1 Journal article (refereed)
Λc+ Production and Baryon-to-Meson Ratios in pp and p-Pb Collisions at √sNN = 5.02 TeV at the LHC (2021)
ALICE Collaboration. (2021). Λc+ Production and Baryon-to-Meson Ratios in pp and p-Pb Collisions at √sNN = 5.02 TeV at the LHC. Physical Review Letters, 127(20), Article 054905. https://doi.org/10.1103/PhysRevLett.127.202301
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Publication details
All authors or editors: ALICE Collaboration
Journal or series: Physical Review Letters
ISSN: 0031-9007
eISSN: 1079-7114
Publication year: 2021
Volume: 127
Issue number: 20
Article number: 054905
Publisher: American Physical Society
Publication country: United States
Publication language: English
DOI: https://doi.org/10.1103/PhysRevLett.127.202301
Publication open access: Openly available
Publication channel open access: Partially open access channel
Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/79191
Publication is parallel published: https://arxiv.org/abs/2011.06078
Abstract
The prompt production of the charm baryon Λ+c and the Λ+c/D0 production ratios were measured at midrapidity with the ALICE detector in pp and p-Pb collisions at √sNN = 5.02 TeV. These new measurements show a clear decrease of the Λ+c/D0 ratio with increasing transverse momentum (pT) in both collision systems in the range 2<12 GeV/c, exhibiting similarities with the light-flavor baryon-to-meson ratios p/π and Λ/K0S. At low pT, predictions that include additional color-reconnection mechanisms beyond the leading-color approximation, assume the existence of additional higher-mass charm-baryon states, or include hadronization via coalescence can describe the data, while predictions driven by charm-quark fragmentation processes measured in e+e− and e−p collisions significantly underestimate the data. The results presented in this Letter provide significant evidence that the established assumption of universality (colliding-system independence) of parton-to-hadron fragmentation is not sufficient to describe charm-baryon production in hadronic collisions at LHC energies.
Keywords: particle physics
Contributing organizations
Ministry reporting: Yes
Reporting Year: 2021
JUFO rating: 3
