https://doi.org/10.1140/epjc/s10052-024-13245-z
Letter
An improved description of charm fragmentation data
1
Sorbonne Université, CNRS, Laboratoire de Physique Théorique et Hautes Énergies, LPTHE, 75005, Paris, France
2
Université Paris Cité, LPTHE, 75006, Paris, France
3
Dipartimento di Fisica, Università di Genova and INFN, Sezione di Genova, Via Dodecaneso 33, 16146, Genoa, Italy
Received:
11
June
2024
Accepted:
10
August
2024
Published online:
2
September
2024
We consider the fragmentation of heavy quarks into heavy-flavoured hadrons, specifically the production of charmed mesons in 
collisions, at different centre-of-mass energies. We focus our attention on the ratio of moments of the 
energy spectrum measured by ALEPH and CLEO. This ratio is believed to provide us with a direct test of perturbative QCD evolution because hadronisation effects should cancel between the numerator and denominator. However, state-of-the-art calculations based on standard (final-state) collinear factorisation fail to describe the experimental data. We show that this discrepancy is considerably reduced if heavy-quark threshold effects are accounted for not only in DGLAP evolution, as it is usually done, but also in the resummed coefficient functions.
© The Author(s) 2024
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Funded by SCOAP3.
