TY  - EJOUR
AU  - Thorne, Robert
AU  - Cridge, Thomas
AU  - Harland-Lang, Lucian
TI  - MSHT Updates 2024
IS  - DESY-24-115
M1  - PUBDB-2024-04726
M1  - DESY-24-115
M1  - arXiv:2408.10008
PY  - 2024
N1  - to be submitted to arxiv and for proceedings of the PoS DIS2024 conference
AB  - 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.
LB  - PUB:(DE-HGF)25
DO  - DOI:10.3204/PUBDB-2024-04726
UR  - https://bib-pubdb1.desy.de/record/610892
ER  -