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

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....

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Autores principales: Harland-Lang, L. A., Martin, A. D., Motylinski, P., Thorne, R. S.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Berlin Heidelberg 2016
Materias:
Regular Article - Theoretical Physics
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5312163/
https://www.ncbi.nlm.nih.gov/pubmed/28260970
http://dx.doi.org/10.1140/epjc/s10052-016-4020-1
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author Harland-Lang, L. A.
Martin, A. D.
Motylinski, P.
Thorne, R. S.
author_facet Harland-Lang, L. A.
Martin, A. D.
Motylinski, P.
Thorne, R. S.
author_sort Harland-Lang, L. A.
collection PubMed
description 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 [Formula: see text] 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 [Formula: see text] . This can be improved by phenomenologically motived corrections to [Formula: see text] which parametrically are largely in the form of higher-twist type contributions.
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spelling pubmed-53121632017-03-01 The impact of the final HERA combined data on PDFs obtained from a global fit Harland-Lang, L. A. Martin, A. D. Motylinski, P. Thorne, R. S. Eur Phys J C Part Fields Regular Article - Theoretical Physics 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 [Formula: see text] 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 [Formula: see text] . This can be improved by phenomenologically motived corrections to [Formula: see text] which parametrically are largely in the form of higher-twist type contributions. Springer Berlin Heidelberg 2016-04-06 2016 /pmc/articles/PMC5312163/ /pubmed/28260970 http://dx.doi.org/10.1140/epjc/s10052-016-4020-1 Text en © The Author(s) 2016 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), 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
spellingShingle Regular Article - Theoretical Physics
Harland-Lang, L. A.
Martin, A. D.
Motylinski, P.
Thorne, R. S.
The impact of the final HERA combined data on PDFs obtained from a global fit
title The impact of the final HERA combined data on PDFs obtained from a global fit
title_full The impact of the final HERA combined data on PDFs obtained from a global fit
title_fullStr The impact of the final HERA combined data on PDFs obtained from a global fit
title_full_unstemmed The impact of the final HERA combined data on PDFs obtained from a global fit
title_short The impact of the final HERA combined data on PDFs obtained from a global fit
title_sort impact of the final hera combined data on pdfs obtained from a global fit
topic Regular Article - Theoretical Physics
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5312163/
https://www.ncbi.nlm.nih.gov/pubmed/28260970
http://dx.doi.org/10.1140/epjc/s10052-016-4020-1
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