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The effect of LHC jet data on MSTW PDFs

We consider the effect on LHC jet cross sections on partons distribution functions (PDFs), in particular the MSTW2008 set of PDFs. We first compare the published inclusive jet data to the predictions using MSTW2008, finding a very good description. We also use the parton distribution reweighting pro...

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Autores principales: Watt, B. J. A., Motylinski, P., Thorne, R. S.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Berlin Heidelberg 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4370907/
https://www.ncbi.nlm.nih.gov/pubmed/25814899
http://dx.doi.org/10.1140/epjc/s10052-014-2934-z
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author Watt, B. J. A.
Motylinski, P.
Thorne, R. S.
author_facet Watt, B. J. A.
Motylinski, P.
Thorne, R. S.
author_sort Watt, B. J. A.
collection PubMed
description We consider the effect on LHC jet cross sections on partons distribution functions (PDFs), in particular the MSTW2008 set of PDFs. We first compare the published inclusive jet data to the predictions using MSTW2008, finding a very good description. We also use the parton distribution reweighting procedure to estimate the impact of these new data on the PDFs, finding that the combined ATLAS 2.76 and 7 TeV data, and CMS 7 TeV data have some significant impact. We then also investigate the impact of ATLAS, CMS and DØ dijet data using the same techniques. In this case we investigate the effect of using different scale choices for the NLO cross section calculation. We find that the dijet data is generally not completely compatible with the corresponding inclusive jet data, often tending to pull PDFs, particularly the gluon distribution, away from the default values. However, the effect depends on the dijet dataset used as well as the scale choice. We also note that conclusions may be affected by limiting the pull on the data luminosity chosen by the best fit, which is sometimes a number of standard deviations. Finally we include the inclusive jet data in a new PDF fit explicitly. This enables us to check the consistency of the exact result with that obtained from the reweighting procedure. There is generally good, but not full quantitative agreement. Hence, the conclusion remains that MSTW2008 PDFs already fit the published jet data well, but the central values and uncertainties are altered and improved, respectively, to a significant, but not dramatic extent by inclusion of these data.
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spelling pubmed-43709072015-03-24 The effect of LHC jet data on MSTW PDFs Watt, B. J. A. Motylinski, P. Thorne, R. S. Eur Phys J C Part Fields Regular Article - Theoretical Physics We consider the effect on LHC jet cross sections on partons distribution functions (PDFs), in particular the MSTW2008 set of PDFs. We first compare the published inclusive jet data to the predictions using MSTW2008, finding a very good description. We also use the parton distribution reweighting procedure to estimate the impact of these new data on the PDFs, finding that the combined ATLAS 2.76 and 7 TeV data, and CMS 7 TeV data have some significant impact. We then also investigate the impact of ATLAS, CMS and DØ dijet data using the same techniques. In this case we investigate the effect of using different scale choices for the NLO cross section calculation. We find that the dijet data is generally not completely compatible with the corresponding inclusive jet data, often tending to pull PDFs, particularly the gluon distribution, away from the default values. However, the effect depends on the dijet dataset used as well as the scale choice. We also note that conclusions may be affected by limiting the pull on the data luminosity chosen by the best fit, which is sometimes a number of standard deviations. Finally we include the inclusive jet data in a new PDF fit explicitly. This enables us to check the consistency of the exact result with that obtained from the reweighting procedure. There is generally good, but not full quantitative agreement. Hence, the conclusion remains that MSTW2008 PDFs already fit the published jet data well, but the central values and uncertainties are altered and improved, respectively, to a significant, but not dramatic extent by inclusion of these data. Springer Berlin Heidelberg 2014-07-01 2014 /pmc/articles/PMC4370907/ /pubmed/25814899 http://dx.doi.org/10.1140/epjc/s10052-014-2934-z Text en © The Author(s) 2014 https://creativecommons.org/licenses/by/4.0/ Open AccessThis article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited. Funded by SCOAP3 / License Version CC BY 4.0.
spellingShingle Regular Article - Theoretical Physics
Watt, B. J. A.
Motylinski, P.
Thorne, R. S.
The effect of LHC jet data on MSTW PDFs
title The effect of LHC jet data on MSTW PDFs
title_full The effect of LHC jet data on MSTW PDFs
title_fullStr The effect of LHC jet data on MSTW PDFs
title_full_unstemmed The effect of LHC jet data on MSTW PDFs
title_short The effect of LHC jet data on MSTW PDFs
title_sort effect of lhc jet data on mstw pdfs
topic Regular Article - Theoretical Physics
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4370907/
https://www.ncbi.nlm.nih.gov/pubmed/25814899
http://dx.doi.org/10.1140/epjc/s10052-014-2934-z
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