\begin{document}$b\to dd{\bar s}$\end{document} is highly suppressed in the Standard Model, which makes it a potential channel for exploring new physics signals. We present a study of the exclusive two-body wrong sign weak decay \begin{document}$\smash{\overline B}^0\to K^+\pi^-$\end{document} , which belongs to this class, in the perturbative QCD framework. We perform a model independent analysis for various effective dimension-6 operators for which large effects are possible. We further analyze the considered process in the Randall-Sundrum model, including the custodially protected and the bulk-Higgs Randall-Sundrum models. Exploring the experimentally favored parameter space of these models leads to a large and significant enhancement of the decay rate compared to the Standard Model, which might be accessible in future experiments. We propose to search for the wrong sign decay \begin{document}$\smash{\overline B}^0\to K^+\pi^-$\end{document} via flavor-tagged time-dependent analyses, which can be performed at LHCb and Belle-II."> New physics search in the doubly weak decay <inline-formula><tex-math id="M1">\begin{document}${{\overline B}^0 \to K^+ \pi^- }$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/af9d5f88-e3c7-49a5-8afb-3edbf368806e/CPC-2018-0440_M1.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/af9d5f88-e3c7-49a5-8afb-3edbf368806e/CPC-2018-0440_M1.png"/></alternatives></inline-formula> -
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