Speaker
Description
An analysis of the decays $B^+ \to K_S^0 \pi^+$ and $B^+ \to K_S^0 K^+$ is performed using $pp$ collision data collected by the LHCb experiment at a centre-of-mass energy of 13TeV, corresponding to an integrated luminosity of $5.4fb^{-1}$. This study provides the world’s most precise measurements of direct CP asymmetries in these modes. In particular, the measurement precision in the theoretically clean $B^+ \to K_S^0 \pi^+$ channel reaches the $\mathcal{O}(0.01)$ level for the first time, enabling a stringent test of the Standard Model prediction of vanishing CP asymmetry and offering crucial input to address the long-standing $K\pi$ puzzle.
In addition, a simultaneous search for the rare decay $B_c^+ \to K_S^0 K^+$, highly suppressed in the Standard Model but potentially enhanced in new physics scenarios, yields the world’s most stringent upper limit. These results constitute a major advance in the study of charmless $B^+$ decays, providing sensitive probes of the Standard Model and possible new sources of CP violation.
