Associated production of a top quark pair with a heavy electroweak gauge boson at NLO+NNLL accuracy

Abstract

We perform threshold resummation of soft gluon corrections to the total cross sections and the invariant mass distributions for production of a top-antitop quark pair associated with a heavy electroweak boson $V=W^{+}$, $W^{-}$ or $Z$ in $pp$ collisions at the Large Hadron Collider. The resummation is carried out at next-to-next-to-leading-logarithmic (NNLL) accuracy using the direct QCD Mellin space technique in the three-particle invariant mass kinematics. It is found that for the $t\bar{t}Z$ process the soft gluon resummation introduces significant corrections to the next-to-leading order (NLO) results. For the central scale equal to the $t\bar{t}Z$ invariant mass the corrections reach nearly 30%. For this process, the dominant theoretical uncertainty of the cross section due to the scale choice is significantly reduced at the NLO+NNLL level with respect to the NLO results. The effects of resummation are found to be less pronounced in the $t\bar{t}{W}^{\pm }$ case. The obtained results are compared to recent measurements performed by CMS and ATLAS collaborations at the LHC.

24 pages, 16 figures

References in corpus (13)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Parton distributions in the LHC era: MMHT 2014 PDFs
• t tbar W and t tbar Z Hadroproduction at NLO accuracy in QCD with Parton Shower and Hadronization effects
• Next-to-leading order QCD corrections to t-tbar-Z production at the LHC
• Weak corrections to Higgs hadroproduction in association with a top-quark pair
• Top-quark charge asymmetry and polarization in $t\bar{t}{W}^{\pm }$ production at the LHC
• QCD corrections to the hadronic production of a heavy quark pair and a W-boson including decay correlations
• NNLL resummation for the associated production of a top pair and a Higgs boson at the LHC
• Renormalization group improved predictions for $t\bar{t}{W}^{\pm }$ production at hadron colliders
• Associated production of a top pair and a W boson at next-to-next-to-leading logarithmic accuracy
• NLO QCD corrections to the production of t-tbar-Z in gluon fusion
• Soft gluon resummation at fixed invariant mass for associated $t\bar{t}H$ production at the LHC
• Soft gluon resummation for the associated production of a top quark pair with a W boson at the LHC

Cited by in corpus (3)

• The top quark legacy of the LHC Run II for PDF and SMEFT analyses
• The simplest of them all: $t\bar{t}{W}^{\pm }$ at NLO accuracy in QCD
• Differential measurement of $\mathrm{t}\bar{\mathrm{t}}\mathrm{Z}$ production at $\sqrt{s}=13\mathrm{TeV}$ with the CMS experiment