https://doi.org/10.1140/epjc/s10052-024-12772-z
Regular Article - Theoretical Physics
Determination of the theory uncertainties from missing higher orders on NNLO parton distributions with percent accuracy
1
The Higgs Centre for Theoretical Physics, University of Edinburgh, JCMB, KB, Mayfield Rd, EH9 3JZ, Edinburgh, Scotland
2
Tif Lab, Dipartimento di Fisica, Università di Milano and INFN, Sezione di Milano, Via Celoria 16, 20133, Milan, Italy
3
CERN, Theoretical Physics Department, 1211, Geneva 23, Switzerland
4
Department of Physics and Astronomy, Vrije Universiteit, 1081 HV, Amsterdam, The Netherlands
5
Nikhef Theory Group, Science Park 105, 1098 XG, Amsterdam, The Netherlands
6
Department of Physics, University of Jyvaskyla, P.O. Box 35, 40014, Jyvaskyla, Finland
7
Helsinki Institute of Physics, University of Helsinki, P.O. Box 64, 00014, Helsinki, Finland
8
DAMTP, University of Cambridge, Wilberforce Road, CB3 0WA, Cambridge, UK
9
Dipartimento di Fisica, Università degli Studi di Torino and INFN, Sezione di Torino, Via Pietro Giuria 1, 10125, Turin, Italy
10
Universität Würzburg, Institut für Theoretische Physik und Astrophysik, 97074, Würzburg, Germany
Received:
22
January
2024
Accepted:
7
April
2024
Published online:
21
May
2024
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. PDF uncertainties on physical predictions in the data region are consequently either unchanged or moderately reduced by the inclusion of MHOUs.
© The Author(s) 2024
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Funded by SCOAP3.
