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arXiv · 2606.06436

Probing anomalous quartic gauge couplings in same-sign $W$ boson scattering with polarization and spin correlation

Oscar J. P. Éboli·Rafiqul Rahaman·Amir Subba
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Abstract

The study of quartic couplings of electroweak gauge bosons not only provides a test of the Standard Model (SM) predictions, but also can look for signals of new physics beyond the SM. We present a comprehensive study of anomalous quartic gauge couplings in same-sign $W^\pm W^\pm$ production via vector boson scattering at the LHC. The analysis is carried out within the framework of the SM Effective Field Theory, exploiting polarization and spin-correlation effects encoded in angular asymmetries in addition to conventional kinematic observables. We demonstrate that spin-correlation asymmetries provide sensitivity to anomalous $WWWW$ interactions that is comparable to that obtained from the transverse mass distribution of the $WW$ system. By identifying a minimal set of the most sensitive asymmetries, we show that the dominant constraints on the Wilson coefficients can be captured with a reduced number of observables. A combined analysis of angular asymmetries and kinematic information leads to improved limits compared to either approach alone. The impact of unitarity considerations is also examined by imposing invariant-mass cut-offs on the $WW$ system, allowing us to determine unitarity-safe regions for the anomalous couplings.

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Oscar J. P. Éboli, Rafiqul Rahaman, Amir Subba. 2026-06-04. Probing anomalous quartic gauge couplings in same-sign $W$ boson scattering with polarization and spin correlation. https://arxiv.org/abs/2606.06436

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