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Anomalous Triple Gauge Couplings in the Effective Field Theory Approach at the LHC

Abstract : We discuss how to perform consistent extractions of anomalous triple gauge couplings (aTGC) from electroweak boson pair production at the LHC in the Standard Model Effective Field Theory (SMEFT). After recasting recent ATLAS and CMS searches in $pp\to WZ (WW) \to \ell' \nu \ell^+\ell^- (\nu_{\ell})$ channels, we find that: (a) working consistently at order $\Lambda^{-2}$ in the EFT expansion the existing aTGC bounds from Higgs and LEP-2 data are not improved, (b) the strong limits quoted by the experimental collaboration are due to the partial $\Lambda^{-4}$ corrections (dimension-6 squared contributions). Using helicity selection rule arguments we are able to explain the suppression in some of the interference terms, and discuss conditions on New Physics (NP) models that can benefit from such LHC analyses. Furthermore, standard analyses assume implicitly a quite large NP scale, an assumption that can be relaxed by imposing cuts on the underlying scale of the process ($\sqrt{\hat{s}}$). In practice, we find almost no correlation between $\sqrt{\hat{s}}$ and the experimentally accessible quantities, which complicates the EFT interpretation. Nevertheless, we provide a method to set (conservative) aTGC bounds in this situation, and recast the present searches accordingly. Finally, we introduce a simple NP model for aTGC to compare the bounds obtained directly in the model with those from the EFT analysis.
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Contributor : Dominique Girod Connect in order to contact the contributor
Submitted on : Monday, October 3, 2016 - 1:38:01 PM
Last modification on : Friday, September 10, 2021 - 1:50:15 PM

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A. Falkowski, M. Gonzalez-Alonso, A. Greljo, D. Marzocca, M. Son. Anomalous Triple Gauge Couplings in the Effective Field Theory Approach at the LHC. Journal of High Energy Physics, Springer Verlag (Germany), 2017, 02, pp.115. ⟨10.1007/JHEP02(2017)115⟩. ⟨in2p3-01375658⟩



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