Illuminating the photon content of the proton within a global PDF analysis - INSPIRE

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Illuminating the photon content of the proton within a global PDF analysis

NNPDF

Collaboration

•

Valerio Bertone
(
- Vrije U., Amsterdam and
- NIKHEF, Amsterdam
)

Dec 19, 2017

33 pages

Published in:

SciPost Phys. 5 (2018) 1, 008

Published: Jul 25, 2018

e-Print:

1712.07053 [hep-ph]

DOI:

10.21468/SciPostPhys.5.1.008 (publication)

Report number:

Nikhef/2017-064,
CERN-TH-2017-235,
NIKHEF-2017-064

Experiments:

NNPDF

View in:

reference search256 citations

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Abstract: (SciPost Fundation)

Precision phenomenology at the LHC requires accounting for both higher-orderQCD and electroweak corrections as well as for photon-initiated subprocesses.Building upon the recent NNPDF3.1 fit, in this work the photon content of theproton is determined within a global analysis supplemented by the LUXqedconstraint relating the photon PDF to lepton-proton scattering structurefunctions: NNPDF3.1luxQED. The uncertainties on the resulting photon PDF are atthe level of a few percent, with photons carrying up to 0.5% of the proton'smomentum. We study the phenomenological implications of NNPDF3.1luxQED at theLHC for Drell-Yan, vector boson pair, top quark pair, and Higgs plus vectorboson production. We find that photon-initiated contributions can besignificant for many processes, leading to corrections of up to 20%. Ourresults represent a state-of-the-art determination of the partonic structure ofthe proton including its photon component.

Note:

29 pages, 19 figures, minor corrections

photon: distribution function
quantum electrodynamics: correction
quantum chromodynamics: correction
correction: higher-order
higher-order: 2
CERN LHC Coll
p p: scattering
Drell-Yan process
top: pair production
vector boson: production

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