  The production of $W/Z$ bosons in association with heavy flavour jets or
hadrons at the LHC is sensitive to the flavour content of the proton and
provides an important test of perturbative QCD. The production of a $W$ boson
in association with $D^{+}$ and $D^{*+}$ mesons will be discussed. This
precision measurement provides information about the strange content of the
proton. Measurements are compared to the state-of-the art
next-to-next-to-leading order theoretical calculations.
