An FONLL prescription with coexisting flavor number PDFs
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arXiv
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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866917793492893696 |
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| author | Barontini, Andrea Candido, Alessandro Hekhorn, Felix Magni, Giacomo Stegeman, Roy |
| author_facet | Barontini, Andrea Candido, Alessandro Hekhorn, Felix Magni, Giacomo Stegeman, Roy |
| contents | We present a new prescription to account for heavy quark mass effects in the determination of parton distribution functions (PDFs) based on the FONLL scheme. Our prescription makes explicit use of the freedom to choose the number of active flavors at a given scale and, thus, use coexisting PDFs with different active flavor number. This new prescription is perturbatively equivalent to the former but improves the implementation in two ways. First, it can be naturally generalized to account simultaneously for multiple heavy quark effects, such as charm and bottom effects, which can both be relevant at the same scale due to the small mass difference. Second, it can be trivially generalized to use at any fixed-order or collinear resummed accuracy, while previous prescriptions required ad-hoc expansions of the DGLAP evolution kernels for each coefficient. We supplement the paper with codes for the computation of deep inelastic scattering observables in this new prescription. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_07383 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | An FONLL prescription with coexisting flavor number PDFs Barontini, Andrea Candido, Alessandro Hekhorn, Felix Magni, Giacomo Stegeman, Roy High Energy Physics - Phenomenology We present a new prescription to account for heavy quark mass effects in the determination of parton distribution functions (PDFs) based on the FONLL scheme. Our prescription makes explicit use of the freedom to choose the number of active flavors at a given scale and, thus, use coexisting PDFs with different active flavor number. This new prescription is perturbatively equivalent to the former but improves the implementation in two ways. First, it can be naturally generalized to account simultaneously for multiple heavy quark effects, such as charm and bottom effects, which can both be relevant at the same scale due to the small mass difference. Second, it can be trivially generalized to use at any fixed-order or collinear resummed accuracy, while previous prescriptions required ad-hoc expansions of the DGLAP evolution kernels for each coefficient. We supplement the paper with codes for the computation of deep inelastic scattering observables in this new prescription. |
| title | An FONLL prescription with coexisting flavor number PDFs |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2408.07383 |