On LHC searches for CP-violating, dimension-6 electroweak gauge boson operators

Abstract

We reconsider the prospects for observing a dimension-6, CP-violating operator involving $W^{+}{W}^{-}Z$ at the LHC. Firstly, we correct a number of earlier calculations of the loop contribution to the neutron electric dipole moment of a companion operator, involving $W^{+}{W}^{-}\gamma$, showing that measurements imply a very strong bound on the companion operator. Secondly, we quantify the link between the two operators, showing that strongly-coupled new physics could only be observable in proposed searches if it appeared at a scale below $\sim 170$ GeV. This is most unlikely, given the null results of other searches at the LHC and elsewhere.

pdfLaTeX, 12 pages, 4 feynmf figures. Formatted for JHEP. v2: Fixed numerical error and added reference

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• Constraints on CP-violating gauge-Higgs operators
• Effective Field Theory in the top sector: do multijets help?
• Comparing EFT and Exact One-Loop Analyses of Non-Degenerate Stops
• Composite Dark Matter with Forbidden Annihilation
• Jet Substructure Measurements of Interference in Non-Interfering SMEFT Effects
• Beautiful and charming chromodipole moments