b-hadron feed-down fraction of \Dzero-meson tagged jets as a function of \ptchjet\ (left) and \zpar\ (right) in \pp\ collisions at $\s=7$ TeV. On the right, the fraction is shown for $5< \ptchjet< 15$ \GeVc\ (circles) and for $15< \ptchjet< 30$ \GeVc\ (squares) The boxes represent the systematic uncertainties, see Section \ref{sec:systunc} for details.