期刊
EUROPEAN PHYSICAL JOURNAL C
卷 79, 期 3, 页码 -出版社
SPRINGER
DOI: 10.1140/epjc/s10052-019-6746-z
关键词
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资金
- DFG [KU 3103/1]
- Polish National Science Center (NCN) [2017/27/B/ST2/02755]
- Ministry of Science and Higher Education of Poland
- Brookhaven National Laboratory
- German Academic Exchange Service (DAAD)
- German Federal Ministry of Education and Research (BMBF)
- People Programme (Marie Curie Actions) of the European Union Seventh Framework Programme (FP7/20072013) under REA [605728]
- Mainz Institute for Theoretical Physics
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 >Z process the soft gluon resummation introduces significant corrections to the next-to-leading order (NLO) results. For the central scale equal to the >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 +/- case. The obtained results are compared to recent measurements performed by CMS and ATLAS collaborations at the LHC.
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