Calculation of two-loop QCD corrections for hadronic single top-quark production in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>t</mml:mi></mml:mrow></mml:math>channel

Assadsolimani, M.; Kant, Philipp; Tausk, Bas; Uwer, Peter

doi:10.1103/physrevd.90.114024

Cited by 26 publications

(26 citation statements)

References 49 publications

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“…For example, the full two-loop diagrams involve four different scales, the Mandelstam variables s and t, the top quark mass m t , and the W boson mass m W . A full two-loop amplitude of this complexity has not been obtained yet, either analytically or numerically, though interesting progress has been made [46,47]. To bypass this complexity, we adopt the structure-function approximation [22], namely, we systematically neglect virtual and real radiation interference between the light quark line and the heavy quark line.…”

Section: Theoretical Frameworkmentioning

confidence: 99%

Differential distributions for t-channel single top-quark production and decay at next-to-next-to-leading order in QCD

Berger

Gao

Zhu

2017

J. High Energ. Phys.

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We present a detailed phenomenological study of the next-to-next-to-leading order (NNLO) QCD corrections for t-channel single top (anti-)quark production and its semi-leptonic decay at the CERN Large Hadron Collider (LHC). We find the NNLO corrections for the total inclusive rates at the LHC with different center of mass energies are generally smaller than the NLO corrections, indicative of improved convergence. However, they can be large for differential distributions, reaching a level of 10% or more in certain regions of the transverse momentum distributions of the top (anti-)quark and the pseudo-rapidity distributions of the leading jet in the event. In all cases the perturbative hard-scale uncertainties are greatly reduced after the NNLO corrections are included. We also show a comparison of the normalized parton-level distributions to recent data from the 8 TeV measurement of the ATLAS collaboration. The NNLO corrections tend to shift the theoretical predictions closer to the measured transverse momentum distribution of the top (anti)-quark. Importantly, for the LHC at 13 TeV, we present NNLO cross sections in a fiducial volume with decays of the top quark included.

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Section: Theoretical Frameworkmentioning

confidence: 99%

Differential distributions for t-channel single top-quark production and decay at next-to-next-to-leading order in QCD

Berger

Gao

Zhu

2017

J. High Energ. Phys.

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“…The use of the (fully differential) structure function approximation builds on the observation that QCD interference between the light-quark line and the heavy-quark line vanishes at NLO and is suppressed at least by a factor of 1/N 2 c at NNLO. The use of such an approximation is also crucial for making this calculation feasible, because interference contributions between the light and heavy-quark lines are not yet available [30] for the full two-loop virtual diagrams. The structure function approximation at NNLO is also used in an earlier…”

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confidence: 99%

NNLO QCD corrections tot-channel single top quark production and decay

et al. 2016

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We present a fully differential next-to-next-to-leading order calculation of t-channel single top-quark production and decay at the LHC under narrow-width approximation and neglecting cross-talk between incoming protons. We focus on the fiducial cross sections at 13 TeV, finding that the next-to-next-to-leading order QCD corrections can reach the level of −6%. The scale variations are reduced to the level of a percent. Our results can be used to improve experimental acceptance estimates and the measurements of the single top-quark production cross section and the top-quark electroweak couplings.Introduction. The top quark can be produced singly at a hadron collider through the electroweak (EW) W tb vertex. There are three production channels: the t-channel and s-channel processes through exchange of a W boson, and associated production of tW . All three channels are sensitive to the structure of the W tb vertex and to the CKM matrix element V tb , an important motivation for their study. Moreover, single top production provides an important window to physics beyond the standard model (SM) [1], e.g., a modified W tb vertex, new heavy quarks, new gauge bosons, flavor-changing neutral current, and so forth. Single top-quark production was first established at the Fermilab Tevatron [2,3], and later at the Large Hadron Collider (LHC) [4][5][6][7]. Single top-quark studies are expected to enter an era of high precision during the upcoming run of the LHC at higher energy and larger luminosity.The t-channel production has the largest rate among the three at the LHC, about 210 pb at √ s = 13 TeV. Significant efforts to improve the theoretical description of this process include next-to-leading order (NLO) QCD corrections in both 4-and 5-flavor schemes in Refs. [8][9][10][11][12][13][14][15][16]. Soft gluon resummation has been considered in Refs. [17][18][19][20]. Matching NLO calculations to parton showers is done in Refs. [21][22][23]. Recently, next-to-nextto-leading order (NNLO) QCD corrections with a stable top quark were calculated in Ref. [24], neglecting certain subleading contributions in color.In this manuscript we present the first fully differential NNLO calculation of t-channel single top quark production and decay at the LHC in the 5-flavor scheme in QCD. We follow Ref. [24] in neglecting cross-talk between the hadronic systems of the two incoming protons. To the best of our knowledge, our calculation is the first to combine QCD corrections at NNLO for production and decay, meaning that a realistic simulation at NNLO is now

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“…Restricting the analysis to the leading-color contribution, the calculation of the NNLO corrections is significantly simplified, since the double box contributions, notoriously difficult to calculate, drop out. As a step beyond this approximation the reduction of the double-box topologies to master integrals has been performed in [32]. However, the occurring master integrals are still unknown, although progress towards their evaluation has been made in [33], where some of the integrals are studied as sample applications.…”

Section: Introductionmentioning

confidence: 99%

Next-to-leading order QCD corrections for single top-quark production in association with two jets

2020

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In this article we calculate the next-to-leading order (NLO) QCD corrections for single on-shell top-quark production in association with two jets at proton-proton colliders. The tW channel is assumed to be measured independently. The QCD corrections to the inclusive cross section are about 28 (22)% for top (anti-top) quark production at the 13 TeV LHC. Theoretical errors are dominated by scale uncertainties, which are found to be around 5% at NLO. Results for various kinematical distributions are also provided using a well-motivated dynamical scale. The QCD corrections are found to have a non-trivial dependence on the phase-space.

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Calculation of two-loop QCD corrections for hadronic single top-quark production in thetchannel

Cited by 26 publications

References 49 publications

Differential distributions for t-channel single top-quark production and decay at next-to-next-to-leading order in QCD

Differential distributions for t-channel single top-quark production and decay at next-to-next-to-leading order in QCD

NNLO QCD corrections tot-channel single top quark production and decay

Next-to-leading order QCD corrections for single top-quark production in association with two jets

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