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Illuminating the photon content of the proton within a global PDF analysis
by Valerio Bertone, Stefano Carrazza, Nathan P. Hartland, Juan Rojo
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Submission summary
| Authors (as registered SciPost users): | Stefano Carrazza |
| Submission information | |
|---|---|
| Preprint Link: | https://arxiv.org/abs/1712.07053v3 (pdf) |
| Date accepted: | 2018-05-29 |
| Date submitted: | 2018-05-25 02:00 |
| Submitted by: | Carrazza, Stefano |
| Submitted to: | SciPost Physics |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approach: | Theoretical |
Abstract
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.
Author comments upon resubmission
List of changes
As listed in the last referee reply.
Published as SciPost Phys. 5, 008 (2018)