# Probing anomalous $t\bar t Z$ interactions with rare meson decays

Brod, Joachim; Greljo, Admir; Stamou, Emmanuel; Uttayarat, Patipan (2015). Probing anomalous $t\bar t Z$ interactions with rare meson decays. Journal of High Energy Physics, 2015(2):141.

## Abstract

Anomalous couplings of the $Z$ boson to top quarks are only marginally constrained by direct searches and are still sensitive to new particle dynamics at the TeV scale. Employing an effective field theory approach we consider the dimension-six operators which generate deviations from the standard-model vector and axial-vector interactions. We show that rare $B$ and $K$ meson decays together with electroweak precision observables provide strong constraints on these couplings. We also consider constraints from t-channel single-top production.

## Abstract

Anomalous couplings of the $Z$ boson to top quarks are only marginally constrained by direct searches and are still sensitive to new particle dynamics at the TeV scale. Employing an effective field theory approach we consider the dimension-six operators which generate deviations from the standard-model vector and axial-vector interactions. We show that rare $B$ and $K$ meson decays together with electroweak precision observables provide strong constraints on these couplings. We also consider constraints from t-channel single-top production.

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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics English 2015 16 Feb 2016 13:28 15 Sep 2017 10:54 Springer 1029-8479 Publisher DOI. An embargo period may apply. https://doi.org/10.1007/JHEP02(2015)141 http://arxiv.org/abs/1408.0792

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