2019/07/31 by L. A. Harland-Lang, A. D. Martin, R. Nathvani +1 · 1 citation
Physics and Astronomy · #Consistency (knowledge bases) #DGLAP #Deep inelastic scattering #Distribution (mathematics) #Distribution function #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Parton #Photon #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #hep-ex #hep-ph
paper · pdf · doi:10.1140/epjc/s10052-019-7296-0
54 pages, 34 figures. Typo corrected in Eq.(7)
openalex created_date 2019/07/12 · openalex publication_date 2019/10/01 · arxiv created 2021/05/07 · arxiv updated 2021/05/10 · openalex updated_date 2026/08/05
Abstract 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(α ) <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>O</mml:mi><mml:mo>(</mml:mo><mml:mi>α</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:math> , \mathcal O(α α S) <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>O</mml:mi><mml:mo>(</mml:mo><mml:mi>α</mml:mi><mml:msub><mml:mi>α</mml:mi><mml:mi>S</mml:mi></mml:msub><mml:mo>)</mml:mo></mml:mrow></mml:math> , \mathcal O(α 2) <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>O</mml:mi><mml:mo>(</mml:mo><mml:msup><mml:mi>α</mml:mi><mml:mn>2</mml:mn></mml:msup><mml:mo>)</mml:mo></mml:mrow></mml:math> . 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.