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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 positron (e^-e^+) and electron proton (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 ||) of jets carried by heavy-flavour hadrons is reported. The azimuthal correlations of c^{+} baryons and D mesons (D⁰, D^+, and D^*+) with primary charged particles in pp collisions at s = 13 TeV are reported as well. Together, these observables provide quantitative access to the angular profile, transverse momentum (p ₓ) 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.
Kumar et al. (Fri,) studied this question.