Single top production in PDF fits

A bstract We study the impact of recent LHC t -channel single top-quark and top-antiquark measurements at centre-of-mass energies of 7, 8 and 13 TeV on the parton distribution functions (PDFs) of the proton. We consider, namely, total cross sections, top-antitop cross section ratios, and differentia...

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Bibliographic Details
Published in:The journal of high energy physics 2020-05, Vol.2020 (5), p.1-47, Article 67
Main Authors: Nocera, Emanuele R., Ubiali, Maria, Voisey, Cameron
Format: Article
Language:English
Subjects:
Classical and Quantum Gravitation
Cross-sections
Distribution functions
Elementary Particles
Flavor (particle physics)
Gluons
High energy physics
Large Hadron Collider
Partons
Physics
Physics and Astronomy
QCD Phenomenology
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Quarks
Regular Article - Theoretical Physics
Relativity Theory
String Theory
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Summary:A bstract We study the impact of recent LHC t -channel single top-quark and top-antiquark measurements at centre-of-mass energies of 7, 8 and 13 TeV on the parton distribution functions (PDFs) of the proton. We consider, namely, total cross sections, top-antitop cross section ratios, and differential distributions. We present a critical appraisal of the data, studying in particular how their description is affected by the theoretical details that enter the computation of the corresponding observables: QCD and electroweak higher-order corrections, the flavour scheme, and the value of the bottom-quark threshold. We perform a series of fits to the data within the NNPDF3.1 framework, whereby next-to-next-to-leading order QCD corrections are applied to single top measurements in a systematic way. We find that there exists an optimal combination of data that maximises consistency with the rest of the dataset, and efficiency in constraining the up, down and, partially, gluon PDFs.
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP05(2020)067