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- Title
Associated production of a top quark pair with a heavy electroweak gauge boson at NLO+NNLL accuracy.
- Authors
Kulesza, Anna; Motyka, Leszek; Schwartländer, Daniel; Stebel, Tomasz; Theeuwes, Vincent
- 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 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 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 t ¯ W ± case. The obtained results are compared to recent measurements performed by CMS and ATLAS collaborations at the LHC.
- Subjects
TOP quarks; GAUGE bosons; GLUONS; HADRON interactions; LARGE Hadron Collider; MASS production
- Publication
European Physical Journal C -- Particles & Fields, 2019, Vol 79, Issue 3, pN.PAG
- ISSN
1434-6044
- Publication type
Article
- DOI
10.1140/epjc/s10052-019-6746-z