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PDF4LHC

08 Oct 2024

PDF4LHC PDFs: LHAPDF grids

Here we enclose the LHAPDF 6 grid files corresponding to the PDF4LHC21 PDFs, published in arXiv:2203.05506.

Please reference the paper if you use the PDFs for a publication.

We provide NNLO grids for the 900 replicas for the baseline set of Monte Carlo replica sets. We also provide a compressed Monte Carlo set with 100 replicas, 40 eigenvectors for a Hessian set where postive definitive PDFs have been imposed at high x, and 40 eigenvectors for a Hessian set where this condition is not imposed. αS=0.118 for the PDFs. Each version is provided with a maximum of five (default) or four active quark flavours, and also in a version with an additional two central sets at αS=0.117 and 0.119 to enable the calculation of the PDF + αS uncertainty.

900 Baseline sets

100 Compressed Monte Carlo replica sets

40 Hessian sets

40 Hessian sets - not positive definite