  We report on a benchmark calculation of the in-medium radiative energy loss
of low-virtuality jet partons within the EPOS3-Jet framework. The radiative
energy loss is based on an extension of the Gunion-Bertsch matrix element for a
massive projectile and a massive radiated gluon. On top of that, the coherence
(LPM effect) is implemented by assigning a formation phase to the trial
radiated gluons in a fashion similar to the approach in JHEP 07 (2011), 118, by
Zapp, Stachel and Wiedemann. In a calculation with a simplified radiation
kernel, we reproduce the radiation spectrum reported in the approach above. The
radiation spectrum produces the LPM behaviour $dI/d\omega\propto\omega^{-1/2}$
up to an energy $\omega=\omega_c$, when the formation length of radiated gluons
becomes comparable to the size of the medium. Beyond $\omega_c$, the radiation
spectrum shows a characteristic suppression due to a smaller probability for a
gluon to be formed in-medium.
  Next, we embed the radiative energy loss of low-virtuality jet partons into a
more realistic "parton gun" calculation, where a stream of hard partons at high
initial energy $E_\text{ini}=100$ GeV and initial virtuality $Q^2=E^2$ passes
through a box of QGP medium with a constant temperature. At the end of the box
evolution, the partons are hadronized using Pythia 8, and the jets are
reconstructed with the FASTJET package. We find that the full jet energy loss
in such scenario approaches a ballpark value reported by the ALICE
collaboration. However, the calculation uses a somewhat larger value of the
coupling constant $\alpha_s$ to compensate for the missing collisional energy
loss of the low-virtuality jet partons.
