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The impact of the final HERA combined data on PDFs obtained from a global fit.

Harland-Lang, L. A. and Martin, A. D. and Motylinski, P. and Thorne, R. S. (2016) 'The impact of the final HERA combined data on PDFs obtained from a global fit.', European physical journal C., 76 (4). p. 186.


We investigate the effect of including the HERA run I + II combined cross section data on the MMHT2014 PDFs. We present the fit quality within the context of the global fit and when only the HERA data are included. We examine the changes in both the central values and the uncertainties in the PDFs. We find that the prediction for the data is good, and only relatively small improvements in χ2χ2 and changes in the PDFs are obtained with a refit at both NLO and NNLO. PDF uncertainties are slightly reduced. There is a small dependence of the fit quality on the value of Q2minQmin2 . This can be improved by phenomenologically motived corrections to FL(x,Q2)FL(x,Q2) which parametrically are largely in the form of higher-twist type contributions.

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Publisher statement:© The Author(s) 2016 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Funded by SCOAP3.
Date accepted:11 March 2016
Date deposited:31 May 2017
Date of first online publication:06 April 2016
Date first made open access:31 May 2017

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