Illuminating the photon content of the proton within a global PDF analysis
| Autor: | Valerio Bertone, Stefano Carrazza, Nathan P. Hartland, Juan Rojo |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Top quark
Particle physics Photon Nuclear Theory nucl-th FOS: Physical sciences General Physics and Astronomy 01 natural sciences 7. Clean energy High Energy Physics - Experiment Vector boson Nuclear Theory (nucl-th) High Energy Physics - Experiment (hep-ex) High Energy Physics - Phenomenology (hep-ph) 0103 physical sciences 010306 general physics Particle Physics - Phenomenology Quantum chromodynamics Physics Large Hadron Collider hep-ex 010308 nuclear & particles physics High Energy Physics::Phenomenology Electroweak interaction Drell–Yan process hep-ph lcsh:QC1-999 High Energy Physics - Phenomenology Nuclear Physics - Theory Higgs boson High Energy Physics::Experiment lcsh:Physics Particle Physics - Experiment |
| Zdroj: | SciPost Physics, Vol 5, Iss 1, p 008 (2018) SciPost Physics |
| ISSN: | 2542-4653 |
| DOI: | 10.21468/scipostphys.5.1.008 |
| Popis: | Precision phenomenology at the LHC requires accounting for both higher-order QCD and electroweak corrections as well as for photon-initiated subprocesses. Building upon the recent NNPDF3.1 fit, in this work the photon content of the proton is determined within a global analysis supplemented by the LUXqed constraint relating the photon PDF to lepton-proton scattering structure functions: NNPDF3.1luxQED. The uncertainties on the resulting photon PDF are at the level of a few percent, with photons carrying up to 0.5% of the proton's momentum. We study the phenomenological implications of NNPDF3.1luxQED at the LHC for Drell-Yan, vector boson pair, top quark pair, and Higgs plus vector boson production. We find that photon-initiated contributions can be significant for many processes, leading to corrections of up to 20%. Our results represent a state-of-the-art determination of the partonic structure of the proton including its photon component. Comment: 29 pages, 19 figures, minor corrections |
| Databáze: | OpenAIRE |
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