Constraints on the CKM angle $\gamma$ and extensions with $B^\pm$ $\to DK^{\ast} {^\pm}$ decays at LHCb

CKM angle $\gamma$ is the least well know of the unitary triangle angles. The most common decay modes studied to determine $\gamma$ are of the form $B \to DK$. These have been extensively looked at in Run 1 at LHCb. Another possibility for LHCb are decays of the type $B^{\pm} \to DK^{*\pm}$. A preliminary look at this final state in the Cabibbo favoured decay of the $D$, $D \to K\pi$ is presented. Data from Run1 and Run2 are used. Further analysis of the other $D \to hh$ modes will give sensitivity to the CKM angle $\gamma$.