Progress in the Determination of the Partonic Structure of the Proton

By S. Forte, Graeme Watt. 2013

148 citations recorded by the source corpus.

We review the state of the art of the determination of the parton substructure of the nucleon, as expressed in terms of parton distribution functions (PDFs) and probed in high-energy lepton–hadron and hadron–hadron collisions. We also assess their implications for current precision collider phenomenology, in particular at the Large Hadron Collider (LHC). We review the theoretical foundations of PDF determination: how cross sections are expressed in terms of PDFs by use of perturbative QCD factorization and evolution, the methodology used to extract PDFs from experimental data, and how different physical processes can be used to constrain different PDFs. We summarize current knowledge of PDFs and the limitations in accuracy that this knowledge currently entails for the computation of hadron collider processes, in particular at the LHC. We discuss the current main sources of theoretical and phenomenological uncertainties and the direction of progress toward their reduction in the future.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/07eeb5107b832377756f4064c857e11d156633e6

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In Nuclear and High Energy Physics

Citations in the corpus

PDF4LHC recommendations for LHC Run II (2015, methodology): “1 The Monte Carlo combination of PDF sets The first step in the construction of a Monte Carlo statistical combination [2,3,101,111,113,114] is the transformation of the Hessian PDF sets into Monte Carlo PDF sets using the WattThorne method [101].”
Parton distributions for the LHC run II (2014, background): “0 dataset uses for the first time in a global fit many datasets whose importance has been repeatedly emphasized for constraining particular PDF combinations [71, 72]: correlated pairs of measurements at different center-of-mass energies (the ATLAS 2.”
Higgs Physics at the HL-LHC and HE-LHC (2019, background): “The detailed understanding of the quark and gluon structure of the proton, quantified by the parton distribution functions (PDFs) [92, 93, 94], is an essential ingredient for the theoretical predictions at hadron colliders.”
Parton distributions from high-precision collider data (2017, background): “[2]) as a clean and powerful constraint on PDFs, particularly the gluon.”
LHAPDF6: parton density access in the LHC precision era (2014, methodology): “[4] for a more comprehensive review of the different approaches, and Refs.”
The Structure of the Proton in the LHC Precision Era (2017, methodology): “70 we show two representative examples of NLO EW corrections for processes relevant for PDF determinations, computed with MCFM at √ s = 13 TeV [535].”
Les Houches 2015: Physics at TeV Colliders Standard Model Working Group Report (2016, methodology): “These recommendations are specifically based on the usage of combined PDF sets, which are obtained using the Monte Carlo (MC) method [185,210], constructed from the combination of Nrep = 300 MC replicas from the NNPDF3.”