Top quark pair production at NNLO in the quark-antiquark channel

Abelof, Gabriel; Ridder, A. Gehrmann–De; Majer, I.

doi:10.1007/jhep12(2015)074

Cited by 30 publications

(28 citation statements)

References 55 publications

(167 reference statements)

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“…This has been possible thanks to the development of subtraction schemes [62][63][64][65][66][67][68][69][70], slicing methods [60,61,71] and the calculation of several two-to-two virtual amplitudes [72][73][74][75][76][77][78][79][80][81][82][83][84][85][86][87][88][89][90][91]. As far as top-quark pair production is concerned, besides our own calculation [10,92] only partial results are known at the differential level [93,94]; there is also progress at the level of total crosssection [95] obtained with slicing methods.…”

Section: Jhep05(2016)034mentioning

confidence: 99%

NNLO QCD predictions for fully-differential top-quark pair production at the Tevatron

Czakon

Fiedler

Heymes

et al. 2016

J. High Energ. Phys.

125

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We present a comprehensive study of differential distributions for Tevatron top-pair events at the level of stable top quarks. All calculations are performed in NNLO QCD with the help of a fully differential partonic Monte-Carlo and are exact at this order in perturbation theory. We present predictions for all kinematic distributions for which data exists. Particular attention is paid on the top-quark forward-backward asymmetry which we study in detail. We compare the NNLO results with existing approximate NNLO predictions as well as differential distributions computed with different parton distribution sets. Theory errors are significantly smaller than current experimental ones with overall agreement between theory and data.

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Section: Jhep05(2016)034mentioning

confidence: 99%

NNLO QCD predictions for fully-differential top-quark pair production at the Tevatron

Czakon

Fiedler

Heymes

et al. 2016

J. High Energ. Phys.

125

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“…This program can then incorporate the jet algorithm used in the experimental measurement as well as any type of event selection cuts. A substantial part of the infrastructure of our program is common to other NNLO calculations of jet production observables within the antenna subtraction method [28][29][30][31][32], which are all part of a newly developed code named NNLOJET. To validate our implementation of the tree-level and one-loop matrix elements, we compared the NLO predictions for dijet and trijet production against SHERPA [33] (in DIS kinematics [34]), which uses OPENLOOPS [35] to automatically generate the one-loop contributions at NLO.…”

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confidence: 99%

Precise QCD Predictions for the Production of Dijet Final States in Deep Inelastic Scattering

2016

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(2016) 'Precise QCD predictions for the production of dijet nal states in deep inelastic scattering.', Physical review letters., 117 (4). 042001.Further information on publisher's website:http://dx.doi.org/10.1103/PhysRevLett.117.042001Publisher's copyright statement:Reprinted with permission from the American Physical Society: Currie, James and Gehrmann, Thomas and Niehues, Jan (2016) 'Precise QCD predictions for the production of dijet nal states in deep inelastic scattering.', Physical review letters., 117 (4). 042001 c 2016 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modi ed, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.

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“…The tt asymmetry, which is nonvanishing starting from the NLO level [17,18], has recently been computed up to the NNLO level [19]. Other NNLO results on differential distributions are starting to appear [20][21][22][23].…”

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confidence: 99%

“…[12][13][14][15]19] for tt production have been performed by using the Stripper method [49]. Parallely, an ongoing effort is being made by using the antenna subtraction method [39,57], which led to the NNLO fully differential computation of tt production in the qq channel [21,22,58] at leading colour and including the light-quark contributions.…”

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confidence: 99%

The $$q_T$$ q T subtraction method for top-quark production at hadron colliders

et al. 2015

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We consider QCD radiative corrections to topquark pair production at hadron colliders. We use the q T subtraction formalism to perform a fully differential computation for this process. Our calculation is accurate up to the next-to-leading order in QCD perturbation theory and it includes all the flavour off-diagonal partonic channels at the next-to-next-to-leading order. We present a comparison of our numerical results with those obtained with the publicly available numerical programs MCFM and Top++.The top quark (t) has a special role [1] in elementary particle physics. Being the heaviest known fundamental constituent, with a mass of about 173.3 GeV [2], it couples strongly to the Higgs boson and it is crucial to the hierarchy problem. Within the Standard Model (SM) the main source of top-quark events in collisions at hadron colliders is top-quark pair production. Many New Physics (NP) models predict the existence of top partners with masses close to the electroweak symmetry breaking scale, which exhibit similar properties as the top quark and can decay into it. Studying the production of tt pairs at hadron colliders can not only shed light on the nature of the electroweak symmetry breaking but it also provides information on the backgrounds of many NP models.The theoretical efforts for obtaining precision predictions for top-quark pair production at hadron colliders started almost three decades ago with the calculation of the nextto-leading order (NLO) QCD corrections to the total cross section [3-6] and kinematical distributions [7] for this production process. The NLO calculations of the total cross section of Refs. [3][4][5][6] were carried out numerically. The expresa e-mail: grazzini@physik.uzh.ch b On leave of absence from INFN, Sezione di Firenze, Sesto Fiorentino, Florence, Italy sions in analytic form of the total partonic cross section 1 at NLO were obtained in Ref. [11]. Recently the calculation of the next-to-next-to-leading order (NNLO) QCD corrections to the tt total cross section was completed [12][13][14][15]. Besides the total cross section, differential cross sections and more general kinematical distributions are of great importance for precision studies. For instance, the tt (forward-backward and charge) asymmetry has received much attention in recent years (see, e.g., Ref.[16]). The tt asymmetry, which is nonvanishing starting from the NLO level [17,18], has recently been computed up to the NNLO level [19]. Other NNLO results on differential distributions are starting to appear [20][21][22][23].This letter is devoted to the NNLO (and NLO) QCD calculation of tt production. In particular, we present the results of the first NNLO application of the q T subtraction formalism [24] to the process of tt production in hadron collisions.At the partonic level, the NNLO calculation of tt production requires the evaluation of tree-level contributions with two additional unresolved partons in the final state, of oneloop contributions with one unresolved parton and of purely virtual contribution...

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Top quark pair production at NNLO in the quark-antiquark channel

Cited by 30 publications

References 55 publications

NNLO QCD predictions for fully-differential top-quark pair production at the Tevatron

NNLO QCD predictions for fully-differential top-quark pair production at the Tevatron

Precise QCD Predictions for the Production of Dijet Final States in Deep Inelastic Scattering

The $$q_T$$ q T subtraction method for top-quark production at hadron colliders

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