Single top-quark production in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>t</mml:mi></mml:math>- channel at CERN LHC: A realistic test of electroweak models

Beccaria, Matteo; Macorini, Guido; Renard, F.M.; Verzegnassi, C.

doi:10.1103/physrevd.74.013008

Cited by 23 publications

(11 citation statements)

References 41 publications

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“…1(a)). This extends previous NLO (QCD or EW) results which are based on the 2 → 2 leading order process [19,20,21,22,23,24,25,26,27]. A comparison of the two calculations allows a first study of their consistency across a broad kinematic range.…”

Section: Introductionsupporting

confidence: 75%

NLO predictions for t-channel production of single top and fourth generation quarks at hadron colliders

Campbell

Frederix

Maltoni

et al. 2009

J. High Energy Phys.

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We present updated NLO predictions for the electroweak t-channel production of heavy quarks at the Tevatron and at the LHC. We consider production of single top and fourth generation t ′ starting from both 2 → 2 and 2 → 3 Born processes. Predictions for tb ′ and t ′ b ′ cross sections at NLO are also given for the first time. A thorough study of the theoretical uncertainties coming from parton distribution functions, renormalisation and factorisation scale dependence and heavy quark masses is performed. Keywords: Top quark, Standard Model, Beyond the Standard Model, Tevatron, LHC. * On leave of absence from CP3, Université catholique de Louvain.

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Section: Introductionsupporting

confidence: 75%

NLO predictions for t-channel production of single top and fourth generation quarks at hadron colliders

Campbell

Frederix

Maltoni

et al. 2009

J. High Energy Phys.

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“…(6.22) includes both t-and s-channel mechanisms. Its NLO EW corrections have been computed before in the context of supersymmetric extensions of the SM [163][164][165] (a soft approximation has been employed in ref. [163] to deal with real-emission contributions).…”

Section: Associated Top-quark and Jet Productionmentioning

confidence: 99%

The automation of next-to-leading order electroweak calculations

Frederix

Frixione

Hirschi

et al. 2018

J. High Energ. Phys.

246

327

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We present the key features relevant to the automated computation of all the leading-and next-to-leading order contributions to short-distance cross sections in a mixed-coupling expansion, with special emphasis on the first subleading NLO term in the QCD+EW scenario, commonly referred to as NLO EW corrections. We discuss, in particular, the FKS subtraction in the context of a mixed-coupling expansion; the extension of the FKS subtraction to processes that include final-state tagged particles, defined by means of fragmentation functions; and some properties of the complex mass scheme. We combine the present paper with the release of a new version of MadGraph5 aMC@NLO, capable of dealing with mixed-coupling expansions. We use the code to obtain illustrative inclusive and differential results for the 13-TeV LHC.

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“…On the other hand, we will investigate how the description of the data is affected by the theoretical details that enter the computation of single top observables. Specifically, we will pay attention to the inclusion of higher-order quantum chromodynamics (QCD) corrections [18][19][20][21][22][23], recently computed up to next-to-next-to-leading order (NNLO) accuracy [24][25][26]; to the effect of next-to-leading order (NLO) electroweak (EW) corrections [27][28][29]; and to the choice of the heavy flavour scheme. In this last respect we will restrict our analysis to NLO QCD, and compare the four-flavour scheme (4FS) [30], in which the bottom quark is treated as a massive final state and does not contribute to the proton wave-function, with the five-flavour scheme (5FS) [18], in which the bottom quark is treated as a light quark, perturbatively generated within the proton above a certain matching scale (often taken to be of the order of the bottom-quark pole mass).…”

Section: Introductionmentioning

confidence: 99%

Single top production in PDF fits

Nocera

Ubiali

Voisey

2020

J. High Energ. Phys.

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We study the impact of recent LHC t-channel single top-quark and topantiquark 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, topantitop 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.

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Single top-quark production in thet- channel at CERN LHC: A realistic test of electroweak models

Cited by 23 publications

References 41 publications

NLO predictions for t-channel production of single top and fourth generation quarks at hadron colliders

NLO predictions for t-channel production of single top and fourth generation quarks at hadron colliders

The automation of next-to-leading order electroweak calculations

Single top production in PDF fits

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