  Jet production and jet substructure modification in heavy-ion collisions have
played an essential role in revealing the in-medium evolution of parton showers
and the determination of the properties of strongly-interacting matter under
extreme conditions. It is imperative to extend these studies to include flavor
tagging and to devise observables that are sensitive to the partonic origin of
jets. The average jet charge, defined as the momentum-weighted sum of the
electric charges of particles inside the jet, is a proxy of the electric charge
of the quark or gluon that initiates the jet. We demonstrate how the
factorization framework of soft-collinear effective theory can be generalized
to evaluate the jet charge in a dense strongly-interacting matter environment,
such as the one produced in nuclear reactions at collider energies. Observables
that can separate the contribution of in-medium branching from the trivial
isospin effects are identified and their connection to established jet
quenching effects is elucidated. We present predictions for the transverse
momentum dependence of the jet charge distribution in nucleus-nucleus
collisions and its modification relative to the proton case.
