CKM $\gamma$ measurements at LHCb

Abstract

The tree-level measurement of the CKM $\gamma$ angle is a crucial test of $CP$ violation in the Standard Model (SM). Discrepancies between direct measurements (tree-level decays) and indirect measurements (loop decays) could indicate physics beyond the SM. Recent measurements using decays such as $B^0\to D{K}^{\ast 0},B^{\pm }\to [D{\pi }^0/\gamma {]}_{D^{\ast }}{h}^{\pm }$ (where $D$ decays to $K_S^0{h}^{+}{h}^{-}$ with $h=K,\pi$) and $B^{\pm }\to [h^{\prime +}{h}^{\prime -}{\pi }^{+}{\pi }^{-}{]}_D{h}^{\pm }$ are presented. Additionally, the combination of previous $\gamma$ measurements at LHCb, excluding the aforementioned results, is also presented. The LHCb result, with a precision of $(63.8_{-3.7}^{+3.5}{)}^{\circ }$ establishes itself as a dominant measurement in this field.

EPS-HEP 2023 Conference