On the NNLO QCD corrections to single-top production at the LHC

By Mathias Brucherseifer, F. Caola, K. Melnikov. 2014

165 citations recorded by the source corpus.

We present a fully-differential calculation of the NNLO QCD corrections to the t-channel mechanism for producing single top quarks at the LHC. We work in the structure function approximation, computing QCD corrections to the light- and heavy-quark lines separately and neglecting the dynamical cross-talk between the two. The neglected contribution, which appears at NNLO for the first time, is color-suppressed and is expected to be sub-dominant. Within this approximation, we find that, for the total cross section, NNLO QCD corrections are in the few percent range and, therefore, are comparable to NLO QCD corrections. We also find that the scale independence of the theoretical prediction for single-top production improves significantly once NNLO QCD corrections are included. Furthermore, we show how these results change if a cut on the transverse momentum of the top quark is applied and derive the NNLO QCD prediction for the ratio of single top and single anti-top production cross sections at the 8 TeV LHC.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/25b51ba6222589af078875b596fb2d9d694c6f16

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Nuclear and High Energy Physics

Citations in the corpus

Collider physics at the precision frontier (2020, methodology): “This fact can be attributed to a delicate cancellation of the various Born diagrams, which is spoiled by the radiative corrections.”
Opportunities in Flavour Physics at the HL-LHC and HE-LHC (2018, methodology): “The measurements can be compared with the SM prediction [1222] at NNLO in QCD, while BSM contributions have been evaluated at NLO [1223–1226].”
The Structure of the Proton in the LHC Precision Era (2017, methodology): “State of the art calculations of this process are based on NNLO QCD theory both for the total cross sections and for differential distributions [388, 389], and LHC measurements at 8 TeV and 13 TeV of total cross sections (including ratios of top to anti–top production) as well as single inclusive di”
Predictions for diphoton production at the LHC through NNLO in QCD (2016, methodology): “Although a variety of other methods for regularizing and combining infrared singularities have been devised [24–26], and used to provide a suite of new predictions for 2 → 2 hadron collider processes [27–32], the relative simplicity of the QT subtraction method is highly appealing [33–39].”
Les Houches 2017: Physics at TeV Colliders Standard Model Working Group Report (2017, methodology): “t/t̄: Fully differential N(2)LOQCD corrections have been completed for the dominant tchannel production process, first for stable tops [149], and more recently including top-decays to NNLO accuracy, in the NWA [185].”
Fully differential NNLO computations with MATRIX (2017, background): “cluster_submit_line[1-99] Lines in cluster submit file to add cluster-specific options.”
Parton distributions from high-precision collider data (2017, background): “These include prompt photon production [163], for which NNLO corrections are now available [164] and whose impact on PDF is well known [165]; single-top production (also known at NNLO [166]); and possibly forward D meson production or more in general processes with final-state D mesons, such as W + ”