PDF4LHC recommendations for LHC Run II
Jon Butterworth, Stefano Carrazza, Amanda Cooper-Sarkar, Albert De, Roeck, Joel Feltesse, Stefano Forte, Jun Gao, Sasha Glazov, Joey Huston,, Zahari Kassabov, Ronan McNulty, Andreas Morsch, Pavel Nadolsky, Voica, Radescu, Juan Rojo, Robert Thorne
TL;DR
This paper updates the PDF4LHC recommendations for LHC Run II, providing guidance on combining and using parton distribution functions with uncertainties, incorporating new data from Run I, and offering practical tools for LHC phenomenology.
Contribution
It introduces a new prescription for combining PDF sets into a single set and discusses tools for their implementation in LHC analyses.
Findings
New combined PDF set proposal for LHC applications
Comparison of recent PDFs including Run I data
Tools for PDF set delivery and usage in phenomenology
Abstract
We provide an updated recommendation for the usage of sets of parton distribution functions (PDFs) and the assessment of PDF and PDF+ uncertainties suitable for applications at the LHC Run II. We review developments since the previous PDF4LHC recommendation, and discuss and compare the new generation of PDFs, which include substantial information from experimental data from the Run I of the LHC. We then propose a new prescription for the combination of a suitable subset of the available PDF sets, which is presented in terms of a single combined PDF set. We finally discuss tools which allow for the delivery of this combined set in terms of optimized sets of Hessian eigenvectors or Monte Carlo replicas, and their usage, and provide some examples of their application to LHC phenomenology.
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