تقرير
Heavy Quark Fragmentation in $e^+e^-$ Collisions to NNLO+NNLL Accuracy in Perturbative QCD
| العنوان: | Heavy Quark Fragmentation in $e^+e^-$ Collisions to NNLO+NNLL Accuracy in Perturbative QCD |
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| المؤلفون: | Bonino, Leonardo, Cacciari, Matteo, Stagnitto, Giovanni |
| المصدر: | JHEP 06 (2024) 040 |
| سنة النشر: | 2023 |
| المجموعة: | High Energy Physics - Phenomenology |
| مصطلحات موضوعية: | High Energy Physics - Phenomenology |
| الوصف: | Fragmentation of heavy quarks into heavy-flavoured hadrons receives both perturbative and non-perturbative contributions. We consider perturbative QCD corrections to heavy quark production in $e^+e^-$ collisions to next-to-next-to-leading order accuracy in QCD with next-to-next-to-leading-logarithmic resummation of quasi-collinear and soft emissions. We study multiple matching schemes, and multiple regularisations of the soft resummation, and observe a significant dependence of the perturbative results on these ingredients, suggesting that NNLO+NNLL perturbative accuracy may not lead to real gains unless the interface with non-perturbative physics is properly analysed. We confirm previous evidence that $D^{*+}$ experimental data from CLEO/BELLE and from LEP are not reconcilable with perturbative predictions employing standard DGLAP evolution. We extract non-perturbative contributions from $e^+e^-$ experimental data for both $D$ and $B$ meson fragmentation. Such contributions can be used to predict heavy-quark fragmentation in other processes, e.g. DIS and proton-proton collisions. Comment: 43 pages, 15 figures, 2 tables; v2 matches the published version |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1007/JHEP06(2024)040 |
| URL الوصول: | http://arxiv.org/abs/2312.12519 |
| رقم الأكسشن: | edsarx.2312.12519 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1007/JHEP06(2024)040 |
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