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

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arxiv 2401.10319 v2 pith:5TQESANY submitted 2024-01-18 hep-ph

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

classification hep-ph
keywords uncertaintiesdeterminationtheorydistributionshighermhousmissingnnlo
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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Forward citations

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