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Studying charm hadronisation into baryons with azimuthal correlations of Λ^+_c with charged particles in pp collisions at √ = 13 TeV

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Τίτλος: Studying charm hadronisation into baryons with azimuthal correlations of Λ^+_c with charged particles in pp collisions at √ = 13 TeV
Συγγραφείς: Poljak, Nikola, Vicković, Linda, Planinić, Mirko, Gotovac, Sven, Karatović, David, Kovačić, Nino
Πηγή: Physics letters. B. 868
Στοιχεία εκδότη: 2025.
Έτος έκδοσης: 2025
Θεματικοί όροι: baryon correlations, Λ_c ^⁺ baryon, charm quark, ALICE experiment, proton-proton collisions, charm hadronisation, LHC, D-meson, angular correlations, Monte Carlo simulations
Περιγραφή: The distribution of angular correlations between prompt charm hadrons and primary charged particles in pp collisions is sensitive to the charm-quark hadronisation process. In this letter, charm-baryon correlations are measured for the first time by studying the azimuthal-angle difference between charged particles and prompt Λ_c ^⁺ baryons produced in pp collisions at a centre-of-mass energy of √s = 13 TeV, with the ALICE detector. Λ_c ^⁺ baryons are reconstructed at midrapidity (|y| < 0.5) in the transverse-momentum interval 3 < pₜ < 16 GeV/c, and correlated with charged particles with pₜ > 0.3 GeV/c and pseudorapidity |η| < 0.8. For 3 < pₜ( Λ_c ^⁺, D) < 5 GeV/c, the comparison with published measurements of D-meson and charged-particle correlations in the same collision system hints at a larger number of low-momentum particles associated with Λ_c ^⁺ -baryon triggers than with D-meson triggers, both in the collinear and opposite directions with respect to the trigger particle. These differences can be quantified by the comparison of the properties of the near- and away-side correlation peaks, and are not reproduced by predictions of various Monte Carlo event generators, generally underpredicting the associated particle yields at pₜ^ (assoc) < 1 GeV/c. This tension between Λ_c ^⁺ -baryon and D-meson associated peak yields could suggest a modified fragmentation of the charm quark, or a different hadronisation process, when a charm baryon is produced in the final state.
Τύπος εγγράφου: Article
ISSN: 0370-2693
DOI: 10.1016/j.physletb.2025.139681
Σύνδεσμος πρόσβασης: https://www.sciencedirect.com/science/article/pii/S0370269325004423
Αριθμός Καταχώρησης: edsair.dris...01492..310985ec5d33bc2accf47f17713b1c5c
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  Data: Studying charm hadronisation into baryons with azimuthal correlations of Λ^+_c with charged particles in pp collisions at √ = 13 TeV
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  Data: 2025.
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  Data: The distribution of angular correlations between prompt charm hadrons and primary charged particles in pp collisions is sensitive to the charm-quark hadronisation process. In this letter, charm-baryon correlations are measured for the first time by studying the azimuthal-angle difference between charged particles and prompt Λ_c ^⁺ baryons produced in pp collisions at a centre-of-mass energy of √s = 13 TeV, with the ALICE detector. Λ_c ^⁺ baryons are reconstructed at midrapidity (|y| &lt; 0.5) in the transverse-momentum interval 3 &lt; pₜ &lt; 16 GeV/c, and correlated with charged particles with pₜ &gt; 0.3 GeV/c and pseudorapidity |η| &lt; 0.8. For 3 &lt; pₜ( Λ_c ^⁺, D) &lt; 5 GeV/c, the comparison with published measurements of D-meson and charged-particle correlations in the same collision system hints at a larger number of low-momentum particles associated with Λ_c ^⁺ -baryon triggers than with D-meson triggers, both in the collinear and opposite directions with respect to the trigger particle. These differences can be quantified by the comparison of the properties of the near- and away-side correlation peaks, and are not reproduced by predictions of various Monte Carlo event generators, generally underpredicting the associated particle yields at pₜ^ (assoc) &lt; 1 GeV/c. This tension between Λ_c ^⁺ -baryon and D-meson associated peak yields could suggest a modified fragmentation of the charm quark, or a different hadronisation process, when a charm baryon is produced in the final state.
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        Value: 10.1016/j.physletb.2025.139681
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    Subjects:
      – SubjectFull: baryon correlations
        Type: general
      – SubjectFull: Λ_c ^⁺ baryon
        Type: general
      – SubjectFull: charm quark
        Type: general
      – SubjectFull: ALICE experiment
        Type: general
      – SubjectFull: proton-proton collisions
        Type: general
      – SubjectFull: charm hadronisation
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      – SubjectFull: LHC
        Type: general
      – SubjectFull: D-meson
        Type: general
      – SubjectFull: angular correlations
        Type: general
      – SubjectFull: Monte Carlo simulations
        Type: general
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      – TitleFull: Studying charm hadronisation into baryons with azimuthal correlations of Λ^+_c with charged particles in pp collisions at √ = 13 TeV
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            NameFull: Poljak, Nikola
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            NameFull: Vicković, Linda
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