Parton distributions with QED corrections

By T. Ball, Valerio Bertone, Stefano Carrazza, Luigi Del Debbio, S. Forte, Alberto Guffanti, Nathan Hartland, Juan Rojo. 2013

639 citations recorded by the source corpus.

We present a set of parton distribution functions (PDFs), based on the NNPDF2.3 set, which includes a photon PDF, and QED contributions to parton evolution. We describe the implementation of the combined QCD+QED evolution in the NNPDF framework. We then provide a first determination of the full set of PDFs based on deep-inelastic scattering data and LHC data for W and Z/γ⁎ Drell–Yan production, using leading-order QED and NLO or NNLO QCD. We compare the ensuing NNPDF2.3QED PDF set to the older MRST2004QED set. We perform a preliminary investigation of the phenomenological implications of NNPDF2.3QED: specifically, photon-induced corrections to direct photon production at HERA, and high-mass dilepton and W pair production at the LHC.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/da29debf13ecc0e7af4144cf63f410e6daee949f

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Citations in the corpus

Heavy Majorana neutrinos from Wγ fusion at hadron colliders (2014, methodology): “Real, initial-state photons from inelastic quark emissions can be studied in MG5 by linking the appropriate Les Houches accord PDFs (LHAPDF) libraries [96] and using the MRST2004QED [72] or NNPDF QED [97] PDF sets.”
Electroweak radiative corrections for collider physics (2019, methodology): “About ten years later, the NNPDF group supported QED corrections and photon PDFs in the NNPDF23qed [412] and NNPDF30qed [413] PDF sets, which were derived from experimental data (DIS, Drell–Yan-like W/Z production).”
Higgs Physics at the HL-LHC and HE-LHC (2019, methodology): “This is due to the updated set of parton distribution functions used for this prediction, i.e. LUXqed_plus_PDF4LHC_nnlo_100 instead of NNPDF23_nlo_as_0118_qed.”
Physics at a 100 TeV pp collider: Higgs and EW symmetry breaking studies (2016, methodology): “3 parton densities [155], showering and hadronization via Pythia8 [156] and the fast detector simulation with Delphes3 [157, 158].”
Event generator tunes obtained from underlying event and multiparton scattering measurements (2015, neutral): “3LO [22, 23]), (ii) new PYTHIA6 (version 6.”
PDF4LHC recommendations for LHC Run II (2015, methodology): “rrections, which were presented for the rst time in Ref. [66] by the MRST group, have been updated in Ref. [67]; a determination of the photon PDF from the data has been presented for the rst time in [68], with the corresponding study in the CT14 framework found in Ref. [69]. It is also important to”
Les Houches 2015: Physics at TeV Colliders Standard Model Working Group Report (2016, background): “3QED [324] parton distributions with αs = 0.”
Parton distributions from high-precision collider data (2017, methodology): “g bias related to the identication of m c as a parameter which determines the size of the charm PDF. A NNPDF3.1QED PDF set including the photon PDF (x;Q2), thereby updating the previous NNPDF2.3QED [154] and NNPDF3.0QED [155] sets. This update should include recent theoretical progress: specically t”
Electroweak and QCD corrections to top-pair hadroproduction in association with heavy bosons (2015, background): “3QED [38], which has the disadvantage of treating QED effects only at the leading order.”