Chanchal Sharma, Kavita Lalwani

27 December 2023

Abstract: In the standard model, mixing and CP violation in the charm sector are expected to be very small, and thus, they constitute a sensitive probe for potential new physics contributions. The “wrong-sign” 𝐷0 −→ 𝐾+𝜋−𝜋0 decay is one of the most promising channels at Belle II, as this can be produced through two interfering processes: a direct doubly Cabibbo-suppressed decay of the 𝐷0 meson, or through 𝐷0-𝐷¯0 mixing followed by a Cabibbo-favored decay of the 𝐷¯0 meson. In this work, we report the time-integrated WS-to-RS ratio of the “wrong-sign” 𝐷0 −→ 𝐾+𝜋−𝜋0 decay in the simulation of the integrated luminosity of 1𝑎𝑏−1 at Belle II. The Belle II is the upgraded experimental facility at SuperKEKB, KEK, Japan. This study will be used to measure the mixing and CP Violation of the "wrong-sign" 𝐷0 −→ 𝐾+𝜋−𝜋0 decay.