We discuss a test of the generalization power of the methodology used in the determination of parton distribution functions (PDFs). The "future test" checks whether the uncertainty on PDFs, in regions in which they are not constrained by current data, is compatible with future data. The test is performed by using the current optimized methodology for PDF determination, but with a limited dataset, as available in the past, and by checking whether results are compatible within uncertainty with the result found using a current more extensive dataset. We use the future test to assess the generalization power of the NNPDF4.0 unpolarized PDF and the NNPDFpol1.1 polarized PDF methodology. Specifically, we investigate whether the former would predict the rise of the unpolarized proton structure function F-2 at small x using only pre-HERA data, and whether the latter would predict the so-called "proton spin crisis" using only pre-EMC data.

Future Tests of Parton Distributions / J. Cruz Martinez, S. Forte, E. Nocera. - In: ACTA PHYSICA POLONICA B. - ISSN 0587-4254. - 52:3(2021), pp. 243-276. ((Intervento presentato al convegno 60th Cracow School of Theoretical Physics : Panorama of Hadronic Physics (KrakSchool) tenutosi a online.

Future Tests of Parton Distributions

J. Cruz Martinez
Primo
;
S. Forte
Secondo
;
E. Nocera
Ultimo
2021

Abstract

We discuss a test of the generalization power of the methodology used in the determination of parton distribution functions (PDFs). The "future test" checks whether the uncertainty on PDFs, in regions in which they are not constrained by current data, is compatible with future data. The test is performed by using the current optimized methodology for PDF determination, but with a limited dataset, as available in the past, and by checking whether results are compatible within uncertainty with the result found using a current more extensive dataset. We use the future test to assess the generalization power of the NNPDF4.0 unpolarized PDF and the NNPDFpol1.1 polarized PDF methodology. Specifically, we investigate whether the former would predict the rise of the unpolarized proton structure function F-2 at small x using only pre-HERA data, and whether the latter would predict the so-called "proton spin crisis" using only pre-EMC data.
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
Proton strucure for discovery at the Large Hadron Collider (NNNPDF)
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/839744
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