Abstract
Diboson production at the LHC is a process of great importance both in the context of tests of the SM and for direct searches for new physics. In this paper we present a phenomenological study of mathrm {W}mathrm {W} (rightarrow mathrm {e^+}nu _{mathrm {e}}mathrm {mu ^-}bar{nu }_{mu }), mathrm {W}mathrm {Z} (rightarrow mathrm {e^-}overline{nu }_{mathrm{e}} mu ^+ mu ^-), and mathrm {Z}mathrm {Z} (rightarrow mathrm {e^+}mathrm {e^-}mu ^+ mu ^-) production considering event selections of interest for the anomalous triple-gauge-boson-coupling searches at the LHC: we provide theoretical predictions within the Standard Model at NLO QCD and NLO EW accuracy and study the effect of the anomalous triple-gauge-boson interactions at NLO QCD. For mathrm {W}mathrm {W} and mathrm {Z}mathrm {Z} the contribution of the loop-induced mathrm {g}mathrm {g}rightarrow mathrm {W}^+mathrm {W}^- and mathrm {g}mathrm {g}rightarrow mathrm {Z}mathrm {Z} processes is included. Anomalous triple-gauge-boson interactions are parametrized in the EFT framework. This paper is the first application of Recola2 in the EFT context.
Highlights
In this paper we present a phenomenological study of WW (→ e+νeμ−νμ), WZ (→ e−νeμ+μ−), and ZZ (→ e+e−μ+μ−) production considering event selections of interest for the anomalous triplegauge-boson-coupling searches at the LHC: we provide theoretical predictions within the Standard Model at NLO QCD and NLO EW accuracy and study the effect of the anomalous triple-gauge-boson interactions at NLO QCD
LO predictions for the gg channel have been computed in Refs. [58,59,60] for stable V s and in Refs. [61,62,63] including leptonic vector-boson decays, while the NLO QCD corrections have been published in Refs. [64,65] where the interference with the Higgs-mediated process gg → H → V V has been neglected
The interference with gg → H → V V has been studied at LO in Refs. [67,68,69,70,71], the LOPS predictions have been presented in Ref. [72], the universal soft–collinear terms of the QCD corrections have been included in Ref. [73], and the full NLO calculation has been published in Ref. [74]
Summary
We compute the NLO QCD corrections to the four-lepton production processes at the LHC including the effect of the anomalous triple-gauge-boson interactions. In addition to the SM O(α4) contribution, we include the effect of the anomalous triple-gauge-boson interactions corresponding to the higherdimensional operators described in Sect. In order to validate the implementation of the non-SM W +W −V (V = Z , γ ) interaction, we compared our results for the LO matrix-element squared computed with Recola with the ones obtained with the VBF@NLO program for the CP-even dimension-6 operators. The NLO QCD corrections to the diagrams involving the anomalous triple-gauge-boson interactions have been computed analytically and the results have been used to cross check the predictions from Recola at the amplitude level. The two models have been compared at the matrix-element level by using the conversion formulas of Sect. 3 and we found perfect agreement when the gauge-boson widths are set to zero.
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