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FT DY K-factors

Emanuele Roberto Nocera requested to merge FTDY_Cfactors into master

This PR contains the NNLO QCD K-factors for the FT DY data already included in NNPDF3.1, specifically

  • for DYE886P and DYE605 the K-factors have been recomputed with NNPDF3.1
  • for DYE886R the K-factors have been added.

In all cases the K-factors have been computed with the version of vrap available in https://github.com/NNPDF/external/pull/58. The isoscalarity of the deuteron or copper targets has been properly taken into account. The K-factors have been pushed in the appropriate theories. Minimal differences are observed between theory 53 (used in NNPDF3.1 w/o the aforementioned corrections) and theory 200 (used in NNPDF4.0 and updated w/ the aforementioned corrections).

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