Speaker
Description
The CKM angle $\gamma$ is a free parameter of the Standard Model of particle physics that determines the level of CP-violation in the quark sector. Measurements of this parameter test the unitarity property of the CKM matrix and act as a sensitive probe for physics beyond the SM. As such, it is a focus of several analyses at LHCb. Direct measurements are usually limited by factors such as model-bias, external inputs or sample size. The Phase Correction method presented in this talk avoids all these problems, promising a new, precise gamma measurement using the golden channel: $B^{\pm}\to[K_{S}^{0} \pi^{+}\pi^{-}]_DK^{\pm}$.
A large source of uncertainty in $\gamma$ can come from $D$-decay strong-phase models. We use both LHCb and BESIII datasets to explore the phase space of the $D$-decay. From them, we determine the strong-phase correction terms necessary to free the description of the strong-phase from any model bias. The unbinned LHCb and BESIII fits maximise the information from both datasets.
Here, I will present the phenomenology of the method and the progress of the ongoing measurement. Our studies show that this has the potential to be the most precise single $\gamma$ measurement to date.
