Tree level $\gamma$ determination at LHCb

LHCb has been investigating several methods to measure precisely the CP-violating parameter $\gamma$. We review studies of $B$ decays, which proceed via tree-level amplitudes, that will determine the value of $\gamma$ with negligible theoretical uncertainty. From a combination of different techniques, both time-dependent and time-independent, a precision of 1.9-2.7° can be achieved with 10 $fb^-1$ of data.