$B^+ \rightarrow D^0 K^+$ decays at CDF

The measurement of BRs and asymmetries of $B^\pm \rightarrow D^0 K^\pm$
modes  is a theoretically clean method for the determination of the CKM
angle $\gamma$.  We present first results of the analysis of these modes
at a hadron collider,  from a sample of 1 fb$^{-1}$ of data collected with
the CDFII detector at the  Tevatron collider at Fermilab.