A<sub>c</sub><SUP>+</SUP> Production and Baryon-to-Meson Ratios in <i>pp</i> and <i>p</i>-Pb Collisions at √S<sub>NN</sub>=5.02 TeV at the LHC



Acharya, S, Adamova, D, Adler, A, Adolfsson, J, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU
et al (show 995 more authors) (2021) A<sub>c</sub><SUP>+</SUP> Production and Baryon-to-Meson Ratios in <i>pp</i> and <i>p</i>-Pb Collisions at √S<sub>NN</sub>=5.02 TeV at the LHC. PHYSICAL REVIEW LETTERS, 127 (20). 202301-.

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Abstract

The prompt production of the charm baryon Λ_{c}^{+} and the Λ_{c}^{+}/D^{0} production ratios were measured at midrapidity with the ALICE detector in pp and p-Pb collisions at sqrt[s_{NN}]=5.02  TeV. These new measurements show a clear decrease of the Λ_{c}^{+}/D^{0} ratio with increasing transverse momentum (p_{T}) in both collision systems in the range 2<p_{T}<12  GeV/c, exhibiting similarities with the light-flavor baryon-to-meson ratios p/π and Λ/K_{S}^{0}. At low p_{T}, 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.

Item Type: Article
Uncontrolled Keywords: ALICE Collaboration
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 17 Dec 2021 16:43
Last Modified: 19 Oct 2023 09:29
DOI: 10.1103/PhysRevLett.127.202301
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3143743