| Autor: |
Matteo Cacciari, Andrea Ghira, Simone Marzani, Giovanni Ridolfi |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
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| Zdroj: |
European Physical Journal C: Particles and Fields, Vol 84, Iss 9, Pp 1-6 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
1434-6052 |
| DOI: |
10.1140/epjc/s10052-024-13245-z |
| Popis: |
Abstract We consider the fragmentation of heavy quarks into heavy-flavoured hadrons, specifically the production of charmed mesons in $$e^+e^-$$ e + e - collisions, at different centre-of-mass energies. We focus our attention on the ratio of moments of the $$D^{*+}$$ 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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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