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Single Top Production in PDF fits
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Single Top Production in PDF fits
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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.
Forward citations
Cited by 1 Pith paper
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Measurement of differential $t$-channel single top (anti)quark production cross-sections at 13 TeV with the ATLAS detector
First separate differential tq and tbarq t-channel single-top cross-sections at 13 TeV, using the full ATLAS Run 2 sample, agree with NLO/NNLO QCD and set −0.12 < C_Qq^{3,1}/Λ² < 0.12 TeV⁻² at 95% CL.
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