An improved description of charm fragmentation data
Fuente:
arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866912012124028928 |
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| author | Cacciari, Matteo Ghira, Andrea Marzani, Simone Ridolfi, Giovanni |
| author_facet | Cacciari, Matteo Ghira, Andrea Marzani, Simone Ridolfi, Giovanni |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_04173 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | An improved description of charm fragmentation data Cacciari, Matteo Ghira, Andrea Marzani, Simone Ridolfi, Giovanni High Energy Physics - Phenomenology 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. |
| title | An improved description of charm fragmentation data |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2406.04173 |