The 2025 International Workshop on the High Energy Circular Electron Positron Collider

Prospect for Measurement of CKM Angle $\gamma$ in $B_s^0 \rightarrow D_s^{\mp} K^{\pm}$ Decays at CEPC

We present a study projecting the sensitivity of measuring Cabibbo–Kobayashi–Maskawa (CKM) matrix elements at the CEPC, via direct observation of semi-leptonic WW decays at a center-of-mass energy (\sqrt{s} = 240\ \text{GeV}). This analysis focuses on determining six CKM matrix elements, including (|V_{cd}|), (|V_{cs}|), (|V_{cb}|), (|V_{ud}|), (|V_{us}|), and (|V_{ub}|), and...

The $b \to s\gamma$ is a critical FCNC process that could be used to probe CP violation (CPV) and New Physics (NP), especially in the context of future Z factory. The Circular Electron-Positron Collider (CEPC) offers inherent advantages for studying flavor physics, as it offers high statistic, clean collision environment, and superior detector performance. We quantify the anticipated precision...