PoS - Proceedings of Science
Volume 449 - The European Physical Society Conference on High Energy Physics (EPS-HEP2023) - T06 QCD and Hadronic Physics
Characterization of heavy-quark fragmentation via jets and correlations with ALICE
S. Kumar*, A. Collaboration  on behalf of the ALICE collaboration
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Pre-published on: February 23, 2024
Published on: March 21, 2024
Fragmentation functions are a key component of quantum chromodynamics (QCD) calculations based on the factorisation approach. They are typically determined from the analysis of electron\textendash positron ($\rm e^-e^+$) and electron\textendash proton ($\rm ep$) collision data. Recent measurements of charm-hadron spectra and of the ratios of charm-hadron abundances in pp collisions have questioned the universality of fragmentation functions across leptonic and hadronic collision systems. In these proceedings, measurements of heavy-flavour jets and angular correlations are presented, which are sensitive to the "local" hadronic environment surrounding a heavy-flavour hadron. In detail, the final measurement on the fraction of longitudinal momentum ($z_{\rm ||}$) of jets carried by heavy-flavour hadrons is reported. The azimuthal correlations of ${\rm \Lambda_c^{+}}$ baryons and D mesons (${\rm D^0}$, ${\rm D^+}$, and $\rm D^{*+}$) with primary charged particles in pp collisions at $\sqrt{s}$ = 13 TeV are reported as well. Together, these observables provide quantitative access to the angular profile, transverse momentum ($p_{\rm T}$) and constituent-multiplicity distributions of the jets produced by the fragmentation of a heavy quark. These measurements allow to investigate the charm fragmentation and hadronisation processes in hadronic collisions, setting constraints for their modelling in event generators.
DOI: https://doi.org/10.22323/1.449.0261
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