  Jet charge has played an important role in experimentally testing the Parton
Model and the Standard Model, and has many potential LHC applications. The
energy-weighted charge of a jet is not an infrared-safe quantity, so
hadronization must be taken into account. Here we develop the formalism to
calculate it, cleanly separating the nonperturbative from the perturbative
physics, which we compute at one-loop order. We first study the average and
width of the jet charge distribution, for which the nonperturbative input is
related to (dihadron) fragmentation functions. In an alternative and novel
approach, we consider the full nonperturbative jet charge distribution and
calculate its evolution and jet algorithm corrections, which has a natural
Monte Carlo-style implementation. Our numerical results are compared to Pythia
and agree well in almost all cases. This calculation can directly be extended
to similar track-based observables, such as the total track momentum generated
by an energetic parton.
