eprintid: 10195907
rev_number: 9
eprint_status: archive
userid: 699
dir: disk0/10/19/59/07
datestamp: 2024-08-19 08:55:19
lastmod: 2024-08-19 08:55:19
status_changed: 2024-08-19 08:55:19
type: article
metadata_visibility: show
sword_depositor: 699
creators_name: Cridge, Thomas
creators_name: Harland-Lang, Lucian A
creators_name: Thorne, Robert S
title: Combining QED and approximate N3LO 3 LO QCD corrections in a global PDF fit: MSHT20qed_an3lo PDFs
ispublished: pub
divisions: UCL
divisions: B04
divisions: C06
divisions: F60
note: Copyright T. Cridge et al. This work is licensed under the Creative Commons Attribution 4.0 International License.
Published by the SciPost Foundation.
abstract: We present the MSHT20qed_an3lo parton distribution functions (PDFs). These result from the first global PDF analysis to combine QED and approximate N3LO (aN3LO) QCD corrections in the theoretical calculation of the PDF evolution and cross sections entering the fit. We examine the PDF impact, and find that the effect of QED is relatively mild in comparison to the aN3LO corrections, although it should still be accounted for at the level of precision now required. These QED corrections are in addition found to roughly factorise from the QCD corrections; that is, their relative impact on the PDFs is roughly the same at NNLO and aN3LO. The fit quality exhibits a very small deterioration at aN3LO upon the inclusion of QED corrections, which is rather smaller than the deterioration observed at NNLO in QCD. The impact on several cross-sections at N3LO is also examined, including the Higgs cross sections at N3LO. Finally, a LO in QCD fit that includes QED corrections is also presented: the MSHT20qed_an3lo set.
date: 2024-07-30
date_type: published
publisher: SCIPOST FOUNDATION
official_url: http://dx.doi.org/10.21468/scipostphys.17.1.026
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 2303683
doi: 10.21468/SciPostPhys.17.1.026
lyricists_name: Thorne, Robert
lyricists_id: RTHOR15
actors_name: Thorne, Robert
actors_id: RTHOR15
actors_role: owner
funding_acknowledgements: 101002090 COLORFREE [European Research Council (ERC)]; ST/T000856/1 [STFC]; ST/X000516/1 [STFC]
full_text_status: public
publication: SciPost Physics
volume: 17
number: 1
article_number: 026
pages: 26
issn: 2542-4653
citation:        Cridge, Thomas;    Harland-Lang, Lucian A;    Thorne, Robert S;      (2024)    Combining QED and approximate N3LO 3 LO QCD corrections in a global PDF fit: MSHT20qed_an3lo PDFs.                   SciPost Physics , 17  (1)    , Article 026.  10.21468/SciPostPhys.17.1.026 <https://doi.org/10.21468/SciPostPhys.17.1.026>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10195907/1/Thorne_SciPostPhys_17_1_026.pdf