Speaker
Description
Despite being a key component of the factorisation theorem used for the calculation of heavy-flavour hadron production, fragmentation functions remain poorly understood due to their non-perturbative nature and must instead be evaluated based on experimental data. Recent measurements comparing charm baryon and meson production in hadronic collisions at low and intermediate transverse momenta have revealed significant deviations from the expected electron-positron and electron-proton baselines, challenging the assumed universality of fragmentation.
To gain a precise understanding of possible novel hadronisation mechanisms involved in hadronic collisions, we present a series of charm-tagged jet-fragmentation studies. These measurements extend the previous single-hadron measurements by exploring the interplay between the final-state charmed hadron and the originary charm quark produced in the hard-parton scattering. Using a larger sample of pp data collected by ALICE during the LHC Run 3, we report a measurement of the longitudinal jet momentum fraction carried by $\Lambda_\mathrm{c}^+$ baryons compared to that carried by ${\rm D}^0$ mesons. We explore these observables differentially as a function of the surrounding colour-charge multiplicity. We also investigate the angular component of fragmentation by comparing the radial displacement of these final state baryons and mesons from the jet axis, giving us a handle on the differences between baryon and meson confinement.
| Category | Experiment |
|---|---|
| Collaboration | ALICE |
