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MSHT PDFs

17 Sep 2021

MSHT20 PDFs: LHAPDF grids

Here we enclose the LHAPDF 6 grid files corresponding to the MSHT20 PDFs, published in arXiv:2012.04684.

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

We provide NLO and NNLO grids for the central fit and 64 eigenvectors sets (corresponding to 32 eigenvectors in the '+' and '-' directions), for a 68% confidence interval. LO grids are provided with 60 eigenvector sets. Grids for the central fit + eigenvectors are provided for αS=0.130 at LO, αS=0.118 and 0.120 at NLO and αS=0.118 at NNLO.

Note a formatting issue lead to the αS grid for LHAPDF interpolation being incorrect in version 1 of all grids. This has now been fixed in version 2 onwards.

Central + eigenvector sets

In addition, alongside the MSHT20 paper we provided central grids for a short ranges of αS values at NLO and NNLO. At NLO αS=0.115-0.122 and at NNLO αS=0.115-0.121, in increments of 0.001. Again for these a formatting issue lead to the αS grid for LHAPDF interpolation being incorrect in version 1 of all grids. This has now been fixed in version 2 onwards.

Following our paper on the αS and heavy quark mass dependence, published in arXiv:2106.10289, we also provide further LHAPDF 6 grids corresponding to these variations as well as some cases with 3 and 4 flavours only, if you use any of these please reference this paper (as well as the original MSHT20 paper).

Central sets for small αS ranges

Central sets for large αS ranges

Central sets for mc,b ranges

Central + eigenvector sets for 3 and 4 flavours