Abstract
We for the first time identify all the dimension-8 (dim-8) SMEFT operators that can have an interference with the SM with E4/Λ4 enhancement in the high energy limit for the processes \( q\overline{q}\to WW/ WZ \). Our results therefore explicitly show that the non-interference observed for the dimension-six does not extend to dimension-eight. We compute the contributions of those dimension-8 operators to the cross-section at the 14 TeV Large Hadron Collider and compare the results with dimension-6 (dim-6) originated corrections at the order of dim-6-SM interference and dim-6 squared. We find one (two) dim-8 operator(s) can generate amplitudes of a similar order of magnitude compared with their dim-6 squared counterparts assuming unity dimensionless Wilson coefficients. During the study, new non-interference scenarios are found due to the selection rule of angular momentum as well as strong suppression due to the symmetric initial state for the proton-proton collider.
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Acknowledgments
HL thanks Rafael Aoude, Olivier Mattelaer, Zhe Ren, Ming-Lei Xiao and Yu-Hui Zheng for the helpful discussion. HL is supported by the 4.4517.08 IISN-F.N.R.S convention.
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Degrande, C., Li, HL. Impact of dimension-8 SMEFT operators on diboson productions. J. High Energ. Phys. 2023, 149 (2023). https://doi.org/10.1007/JHEP06(2023)149
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DOI: https://doi.org/10.1007/JHEP06(2023)149