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Exploring the non-universality of charm hadronisation through the measurement of the fraction of jet longitudinal momentum carried by $\Lambda_{\rm c}^+$ baryons in pp collisions

The ALICE collaboration
Acharya, Shreyasi , Adamova, Dagmar , Adler, Alexander , Aglieri Rinella, Gianluca , Agnello, Michelangelo , Agrawal, Neelima , Ahammed, Zubayer , Ahmad, Shakeel , Ahn, Sang Un , Ahuja, Ishaan
Phys.Rev.D 109 (2024) 072005, 2024.
https://doi.org/10.17182/hepdata.151164

Abstract (data abstract)
Recent measurements of charm-baryon production in hadronic collisions have questioned the universality of charm-quark fragmentation across different collision systems. In this work the fragmentation of charm quarks into charm baryons is probed, by presenting the first measurement of the longitudinal jet momentum fraction carried by $\Lambda_{\rm{c}}^{+}$ baryons, $z_{\parallel}$, in hadronic collisions. The results are obtained in proton--proton (pp) collisions at $\sqrt{s}=13$ TeV at the LHC, with $\Lambda_{\rm{c}}^{+}$ baryons and track-based jets reconstructed in the transverse momentum intervals of $3 \leq p_{\rm{T}}^{\Lambda_{\rm{c}}^{+}} < 15$ GeV$/\it{c}$ and $7 \leq p_{\rm{T}}^{\rm{jet,ch}} < 15$ GeV$/\it{c}$, respectively. The $z_{\parallel}$ distribution is compared to a measurement of D$^{0}$-tagged charged jets in pp collisions as well as to PYTHIA 8 simulations. The data hints that the fragmentation of charm quarks into charm baryons is softer with respect to charm mesons, as predicted by hadronisation models which include colour correlations beyond leading-colour in the string formation.

  • $z_{\parallel}^{\rm{ch}}$

    Data from the $z_{\parallel}^{\rm{ch}}$ distributions for $\Lambda_{\rm{c}}^{+}$-tagged charged jets and D$^{0}$-tagged charged jets

    10.17182/hepdata.151164.v1/t1

    $z_{\parallel}^{\rm{ch}}$ for $\Lambda_{\rm{c}}^{+}$-tagged jets and D$^{0}$-tagged jets in the $p_{\rm{T}}^{\rm{jet\text{ }ch}}$: 7-15 GeV/$c$ interval.

  • $\Lambda_{\rm{c}}^{+}$ D$^{0}$ Ratio

    Data from the ratio of $z_{\parallel}^{\rm{ch}}$ distributions of $\Lambda_{\rm{c}}^{+}$-tagged charged jets and D$^{0}$-tagged charged jets

    10.17182/hepdata.151164.v1/t2

    $z_{\parallel}^{\rm{ch}}$ ratio of $\Lambda_{\rm{c}}^{+}$-tagged jets and D$^{0}$-tagged jets in the $p_{\rm{T}}^{\rm{jet\text{ }ch}}$: 7-15 GeV/$c$ interval.

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