PineAPPL: NLO EW corrections for PDF processes

TL;DR

PineAPPL is a new tool that enables consistent inclusion of NLO electroweak corrections in PDF process calculations, improving precision in PDF fits and phenomenology.

Contribution

It introduces PineAPPL, supporting perturbative EW and strong corrections in interpolation grids, facilitating comprehensive PDF fits and phenomenological studies.

Findings

Larger NLO EW effects observed in Drell-Yan production.

PineAPPL allows for EW corrections in PDF determinations.

Potential impact on future PDF fits and precision measurements.

Abstract

Modern parton distribution function (PDF) determinations either neglect higher-order corrections in the electroweak (EW) coupling or implement them approximately for a subset of PDF processes. We present a new tool, PineAPPL, which supports perturbative correction in arbitrary powers of the EW and strong coupling constant, and stores theoretical predictions independently of the used PDFs in so-called interpolation grids. These are the foundation of any PDF determination, and will allow us to perform a PDF fit taking into account EW corrections for all processes consistently. Apart from PDF determinations PineAPPL can also be used in precision phenomenology to study the impact of different choices of PDF sets, without rerunning the time-consuming computation. As an application of this tool we show Drell-Yan (DY) lepton-pair production were larger effects of NLO EW corrections can be seen that will potentially influence the PDF fit and comment about which observables are particularly suited and NLO EW PDF fit and which are not.