The need of percent precision in high energy physics requires the inclusion of QED effects in theoretical predictions, including the contribution of photon-initiated processes. In this contribution we present ongoing work towards extending the NNPDF4.0 NNLO determination of parton distribution functions (PDFs) with QED effects and a photon PDF. We study the impact of QED effects in the NNPDF4.0 fit, compare our results with NNPDF3.1QED and other recent QED PDF fits, and we assess the impact of the photon PDF for representative LHC processes.
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Niccolò Laurenti (2023) studied this question.
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