We include uncertainties due to missing higher order corrections to QCD computations (MHOU) used in the determination of parton distributions (PDFs) in the recent NNPDF4.0 set of PDFs. We use our previously published methodology, based on the treatment of MHOUs and their full correlations through a theory covariance matrix determined by scale variation, now fully incorporated in the new NNPDF theory pipeline. We assess the impact of the inclusion of MHOUs on the NNPDF4.0 central values and uncertainties, and specifically show that they lead to improved consistency of the PDF determination with an ensuing moderate reduction of PDF uncertainties at NNLO.

Determination of the theory uncertainties from missing higher orders on NNLO parton distributions with percent accuracy / R.D. Ball, A. Barontini, A. Candido, S. Carrazza, J. Cruz-Martinez, L. Del Debbio, S. Forte, T. Giani, F. Hekhorn, Z. Kassabov, N. Laurenti, G. Magni, E.R. Nocera, T.R. Rabemananjara, J. Rojo, C. Schwan, R. Stegeman, M. Ubiali. - (2024 Jan 18).

Determination of the theory uncertainties from missing higher orders on NNLO parton distributions with percent accuracy

A. Barontini
Secondo
;
A. Candido;S. Carrazza;J. Cruz-Martinez;S. Forte;F. Hekhorn;Z. Kassabov;N. Laurenti;E.R. Nocera;T.R. Rabemananjara;J. Rojo;C. Schwan;R. Stegeman
Penultimo
;
2024

Abstract

We include uncertainties due to missing higher order corrections to QCD computations (MHOU) used in the determination of parton distributions (PDFs) in the recent NNPDF4.0 set of PDFs. We use our previously published methodology, based on the treatment of MHOUs and their full correlations through a theory covariance matrix determined by scale variation, now fully incorporated in the new NNPDF theory pipeline. We assess the impact of the inclusion of MHOUs on the NNPDF4.0 central values and uncertainties, and specifically show that they lead to improved consistency of the PDF determination with an ensuing moderate reduction of PDF uncertainties at NNLO.
High Energy Physics - Phenomenology; High Energy Physics - Phenomenology
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
18-gen-2024
http://arxiv.org/abs/2401.10319v1
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1030688
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