Cridge, T;
Harland-Lang, LA;
Thorne, RS;
(2024)
The impact of LHC jet and Z pT data at up to approximate N3LO
order in the MSHT global PDF fit.
The European Physical Journal C
, 84
, Article 446. 10.1140/epjc/s10052-024-12771-0.
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Abstract
We present an analysis of two key sets of data constraining the high x gluon at up to approximate N3LO in QCD within the MSHT global PDF fitting framework. We begin with LHC 7 and 8 TeV inclusive jet and dijet production at both NNLO and aN3LO. This makes use of the formalism established in the previous global MSHT20aN3LO PDF fit, but now considers the role of dijet production for the first time at this order. We present a detailed comparison of the fit quality and PDF impact for both cases, and consider the role that electroweak corrections, and the scale choice for inclusive jet production has. Some mild tension between these data sets in the impact on the high x gluon is seen at NNLO, but this is largely eliminated at aN3LO. While a good fit quality to the dijet data is achieved at both orders, the fit quality to the inclusive jet data is relatively poor. We examine the impact of including full colour corrections in a global PDF fit for the first time, finding this to be relatively mild. We also revisit the fit to the ATLAS 8 TeV ZpT data, considering the role that the pT cuts, data selection and different aspects of the aN3LO treatment have on the fit quality and PDF impact. We observe that in all cases the aN3LO fit quality is consistently improved relative to the NNLO, indicating a clear preference for higher order theory for these data.
| Type: | Article |
|---|---|
| Title: | The impact of LHC jet and Z pT data at up to approximate N3LO order in the MSHT global PDF fit |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1140/epjc/s10052-024-12771-0 |
| Publisher version: | http://dx.doi.org/10.1140/epjc/s10052-024-12771-0 |
| Language: | English |
| Additional information: | This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10192668 |
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