Preprint

PUBDB-2024-04726

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png MSHT Updates 2024

Thorne, R. (Corresponding author) ; Cridge, T.DESY* ; Harland-Lang, L.

2024

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Please use a persistent id in citations: doi:10.3204/PUBDB-2024-04726

Report No.: DESY-24-115; arXiv:2408.10008

Abstract: We present various recent updates related to the MSHT20 PDF sets, and particularly to the MSHT20 approximate N3LO (aN3LO) PDFs. These include an investigation of including eitherinclusive jet data or dijet data, and the detailed treatment of 𝑍 𝑝 𝑇 data, and the impact on the gluon PDF in particular. We also very briefly summarize the determination of the strong coupling via a aN3LO global PDF fit, finding 𝛼 𝑆 (𝑀_𝑍^2 ) = 0.1170 ± 0.016, and of including QED corrections in the aN3LO analysis. Finally we consider the preliminary finding associated with the effect of improved knowledge of the N3LO splitting functions on the aN3LO PDFs. In particular we note a relatively small, but significant impact on the gluon distribution, but a rather more limited impact on the gluon-gluon luminosity unless strong rapidity cuts are imposed. Hence, we conclude that while details of our aN3LO PDFs will change with more precise splitting functions, only relatively minor effects on predictions are likely to result.

Note: to be submitted to arxiv and for proceedings of the PoS DIS2024 conference

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Contributing Institute(s):

1. Theorie-Gruppe (T)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)
2. COLORFREE - High-Precision Global Analysis of Color-Free LHC Processes at Small Recoil (101002090) (101002090)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2024

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Database coverage:
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