Calculations of high-energy processes involving the production of b-quarks are typically performed in two different ways, the massive four-flavour scheme (4FS) and the massless five-flavour scheme (5FS). For processes where the combination of the 4FS and 5FS results into a matched calculation is technically difficult, it is possible to define a hybrid scheme known as the doped scheme, where above the b-quark threshold the strong coupling runs with nf=5, as in the massless calculation, while the DGLAP splitting functions are those of the nf=4 scheme. In this contribution we present NNPDF3.0 PDF sets in this doped scheme, compare them with the corresponding 4FS and 5FS sets, and discuss their relevance for LHC phenomenology.

Doped Parton Distributions / V. Bertone, S. Carrazza, J. Rojo. - (2015 Sep 24). ((Intervento presentato al 27. convegno Rencontres de Blois on Particle Physics and Cosmology tenutosi a Blois nel 2015.

Doped Parton Distributions

S. Carrazza;
2015-09-24

Abstract

Calculations of high-energy processes involving the production of b-quarks are typically performed in two different ways, the massive four-flavour scheme (4FS) and the massless five-flavour scheme (5FS). For processes where the combination of the 4FS and 5FS results into a matched calculation is technically difficult, it is possible to define a hybrid scheme known as the doped scheme, where above the b-quark threshold the strong coupling runs with nf=5, as in the massless calculation, while the DGLAP splitting functions are those of the nf=4 scheme. In this contribution we present NNPDF3.0 PDF sets in this doped scheme, compare them with the corresponding 4FS and 5FS sets, and discuss their relevance for LHC phenomenology.
High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Experiment (hep-ex)
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
https://arxiv.org/abs/1509.04022
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/615415
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