An improved description of charm fragmentation data - Archive ouverte HAL Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2024

An improved description of charm fragmentation data

Andrea Ghira
  • Fonction : Auteur
Simone Marzani
  • Fonction : Auteur
Giovanni Ridolfi
  • Fonction : Auteur

Résumé

We consider the fragmentation of heavy quarks into heavy-flavoured hadrons, specifically the production of charmed mesons in $e^+e^-$ collisions, at different centre-of-mass energies. We focus our attention on the ratio of moments of the $D^{*+}$ 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.

Dates et versions

hal-04609845 , version 1 (12-06-2024)

Identifiants

Citer

Matteo Cacciari, Andrea Ghira, Simone Marzani, Giovanni Ridolfi. An improved description of charm fragmentation data. 2024. ⟨hal-04609845⟩
0 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More