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arXiv · 1909.11576

QCD Corrections in SMEFT Fits to $WZ$ and $WW$ Production

Julien Baglio·Sally Dawson·Samuel Homiller
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Abstract

We investigate the role of anomalous gauge boson and fermion couplings on the production of $WZ$ and $W^+W^-$ pairs at the LHC to NLO QCD in the Standard Model effective field theory, including dimension-6 operators. Our results are implemented in a publicly available version of the POWHEG-BOX. We combine our $WZ$ results in the leptonic final state $e\nu \mu^+\mu^-$ with previous $W^+W^-$ results to demonstrate the numerical effects of NLO QCD corrections on the limits on effective couplings derived from ATLAS and CMS 8 and 13 TeV differential measurements. Our study demonstrates the importance of including NLO QCD SMEFT corrections in the $WZ$ analysis, while the effects on $WW$ production are smaller. We also show that the $\mathcal{O}(1/\Lambda^4)$ contributions dominate the analysis, where $\Lambda$ is the high energy scale associated with the SMEFT.

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Julien Baglio, Sally Dawson, Samuel Homiller. 2019-09-23. QCD Corrections in SMEFT Fits to $WZ$ and $WW$ Production. https://doi.org/10.1103/physrevd.100.113010

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