  Jet pull is an observable designed to probe colour flow between jets. Thus
far, a particular projection of the pull vector, the pull angle, has been
employed to distinguish colour flow between jets produced by a colour singlet
or an octet decay. This is of particular importance in order to separate the
decay of a Higgs boson to a pair of bottom quarks from the QCD background.
However, the pull angle is not infra-red and collinear (IRC) safe. In this
paper we introduce IRC safe projections of the pull vector that exhibit good
sensitivity to colour flow, while maintaining calculability. We calculate these
distributions to next-to-leading logarithmic accuracy, in the context of the
hadronic decay of a Higgs boson, and compare these results to Monte Carlo
simulations. This study allows us to define an IRC safe version of the pull
angle in terms of asymmetry distributions. Furthermore, because of their
sensitivity to wide-angle soft radiation, we anticipate that these asymmetries
can play an important role in assessing subleading colour correlations and
their modelling in general-purpose Monte Carlo parton showers.
