The Path to Proton Structure at One-Percent Accuracy

Understand

We present a new set of parton distribution functions (PDFs) based on a fully global dataset and machine learning techniques: NNPDF4.0.

• We expand the NNPDF3.1 determination with 44 new datasets, mostly from the LHC.
• We derive a novel methodology through hyperparameter optimisation, leading to an efficient fitting algorithm built upon stochastic gradient descent.
• We use NNLO QCD calculations and account for NLO electroweak corrections and nuclear uncertainties.