Ad Lucem: QED Parton Distribution Functions in the MMHT Framework
| Autor: | Robert S. Thorne, Ricky Nathvani, Alan D. Martin, Lucian Harland-Lang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Particle physics
Photon Physics and Astronomy (miscellaneous) Proton FOS: Physical sciences Parton lcsh:Astrophysics 01 natural sciences Computer Science::Digital Libraries High Energy Physics - Experiment High Energy Physics - Experiment (hep-ex) High Energy Physics - Phenomenology (hep-ph) 0103 physical sciences lcsh:QB460-466 Neutron lcsh:Nuclear and particle physics. Atomic energy. Radioactivity 010306 general physics Nuclear Experiment Engineering (miscellaneous) Physics 010308 nuclear & particles physics High Energy Physics::Phenomenology High Energy Physics - Phenomenology Distribution (mathematics) DGLAP Distribution function lcsh:QC770-798 Production (computer science) High Energy Physics::Experiment |
| Zdroj: | European Physical Journal European physical journal C, 2019, Vol.79(10), pp.811 [Peer Reviewed Journal] European Physical Journal C: Particles and Fields, Vol 79, Iss 10, Pp 1-32 (2019) |
| DOI: | 10.48550/arxiv.1907.02750 |
| Popis: | We present the MMHT2015qed PDF set, resulting from the inclusion of QED corrections to the existing set of MMHT Parton Distribution Functions (PDFs), and which contain the photon PDF of the proton. Adopting an input distribution from the LUXqed formulation, we discuss our methods of including QED effects for the full, coupled DGLAP evolution of all partons with QED at $\mathcal{O}(\alpha)$, $\mathcal{O}(\alpha\alpha_{S})$, $\mathcal{O}(\alpha^2)$. While we find consistency for the photon PDF of the proton with other recent sets, building on this we also present a set of QED corrected neutron PDFs and provide the photon PDF separated into its elastic and inelastic contributions. The effect of QED corrections on the other partons and the fit quality is investigated, and the sources of uncertainty for the photon are outlined. Finally we explore the phenomenological implications of this set, giving the partonic luminosities for both the elastic and inelastic contributions to the photon and the effect of our photon PDF on fits to high mass Drell-Yan production, including the photon--initiated channel. Comment: 54 pages, 34 figures. Typo corrected in Eq.(7) |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|