Measurement of the fraction of jet longitudinal momentum carried by ${\Lambda }_{\mathrm{c}}^{+}$ baryons in pp collisions

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 ${\Lambda }_{\mathrm{c}}^{+}$ baryons, $z_{||}^{\mathrm{ch}}$, in hadronic collisions. The results are obtained in proton-proton (pp) collisions at $\sqrt{s}=13$ TeV at the LHC, with ${\Lambda }_{\mathrm{c}}^{+}$ baryons and charged (track-based) jets reconstructed in the transverse momentum intervals of $3\le p_{\mathrm{T}}^{{\Lambda }_{\mathrm{c}}^{+}}<15$ GeV/$c$ and $7\le p_{\mathrm{T}}^{\mathrm{jet}\mathrm{ch}}<15$ GeV/$c$, respectively. The $z_{||}^{\mathrm{ch}}$ distribution is compared to a measurement of ${\mathrm{D}}^0$-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, in the measured kinematic interval, as predicted by hadronisation models which include colour correlations beyond leading-colour in the string formation.

16 pages, 1 captioned figure, authors from page 11, published version, figures at http://alice-publications.web.cern.ch/node/8951

References in corpus (13)

• PYTHIA 6.4 Physics and Manual
• An Introduction to PYTHIA 8.2
• Herwig++ Physics and Manual
• Tuning PYTHIA 8.1: the Monash 2013 Tune
• The Catchment Area of Jets
• Measurement of the charm fragmentation function in D* photoproduction at HERA
• ${\mathrm{\Lambda }}_{\mathrm{c}}^{+}$ production and baryon-to-meson ratios in pp and p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV at the LHC
• ${\mathrm{\Lambda }}_{\mathrm{c}}^{+}$ production in pp and in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Measurement of prompt D${}^0$, ${\Lambda }_c^{+}$, and ${\Sigma }_c^{0,++}$(2455) production in pp collisions at $\sqrt{s}=13$ TeV
• Observation of a multiplicity dependence in the $p_{\mathrm{T}}$-differential charm baryon-to-meson ratios in proton-proton collisions at $\sqrt{s}=13$ TeV
• Measurement of the cross sections of ${\Xi }_{\mathrm{c}}^0$ and ${\Xi }_{\mathrm{c}}^{+}$ baryons and branching-fraction ratio BR(${\Xi }_{\mathrm{c}}^0\to {\Xi }^{-}{\mathrm{e}}^{+}{\nu }_{\mathrm{e}}$)/BR(${\Xi }_{\mathrm{c}}^0\to {\Xi }^{-}{\pi }^{+}$) in pp collisions at 13 TeV
• First measurement of ${\mathrm{\Omega }}_{\mathrm{c}}^0$ production in pp collisions at $\sqrt{s}=13$ TeV
• Measurement of the production of charm jets tagged with ${\mathrm{D}}^0$ mesons in pp collisions at $\sqrt{s}$ = 5.02 and 13 TeV

Cited by in corpus (3)

• Towards the understanding of heavy quarks hadronization: from leptonic to heavy-ion collisions
• Measurements of $\psi (2S)$ and ${\chi }_{c1}(3872)$ production within fully reconstructed jets
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