  Tagged jet measurements in high energy hadronic and nuclear reactions provide
constraints on the energy and parton flavor origin of the parton shower that
recoils against the tagging particle. Such additional insight can be especially
beneficial in illuminating the mechanisms of heavy flavor production in
proton-proton collisions at the LHC and their modification in the heavy ion
environment, which are not fully understood. With this motivation, we present
theoretical results for isolated-photon-tagged and B-meson-tagged b-jet
production at center-of-mass energy 5.1 TeV for comparison to the upcoming
lead-lead data. We find that photon-tagged b-jets exhibit smaller momentum
imbalance shift in nuclear matter, and correspondingly smaller energy loss,
than photon-tagged light flavor jets. Our results show that B-meson tagging is
most effective in ensuring that the dominant fraction of recoiling jets
originate from prompt b-quarks. Interestingly, in this channel the large
suppression of the cross section is not accompanied by a significant momentum
imbalance shift.
