First measurements of the ${\varphi }_3$-sensitive decay $B^{\pm }\to D(K_{\mathrm{S}}^0{\pi }^{+}{\pi }^{-}{\pi }^0)K^{\pm }$ with Belle

Abstract

The current experimental uncertainty on the CKM unitarity triangle angle ${\varphi }_3$ is significantly larger than that on the standard model prediction. A more precise measurement of ${\varphi }_3$ is crucial for testing the SM description of $CP$ violation and probing for new physics effects. The precision can be improved by exploring new $B$ and $D$ decay modes. The first model-independent measurement of the CKM angle ${\varphi }_3$ using $B^{\pm }\to D(K_{\mathrm{S}}^0{\pi }^{+}{\pi }^{-}{\pi }^0)K^{\pm }$ decays is presented here. The GGSZ method is used by binning the five-dimensional phase space of the $D$ decay. This analysis uses the measurement of the average strong-phase differences across the phase space in $D\to K_{\mathrm{S}}^0{\pi }^{+}{\pi }^{-}{\pi }^0$ decays from CLEO-c, as input. The results are obtained from the full Belle data set with an integrated luminosity of 711~fb${}^{-1}$ collected at the ${\rm Y}(4S)$ resonance.

on behalf of the Belle Collaboration, presented at EPS-HEP 2019

References in corpus (1)

• First measurement of the CKM angle ${\varphi }_3$ with $B^{\pm }\to D(K_{\mathrm{S}}^0{\pi }^{+}{\pi }^{-}{\pi }^0)K^{\pm }$ decays