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The initial pre-equilibrium stage of a heavy ion collision can have a significant impact on hard probes of the quark gluon plasma such as jets and heavy quarks. In weak coupling QCD the properties of this pre-equilibrium phase can be understood by effective kinetic theory, which can follow the development of the system from the glasma to hydrodynamics. We compute the jet quenching parameter q̂ and the heavy quark momentum diffusion coefficient using the effective kinetic theory this bottom-up isotropization phase. To a first approximation these coefficients are similar to a thermal system with the same energy density. However, unlike the thermal case these coefficients are also anisotropic. They are also enhanced in the earliest overoccupied phase and suppressed in the later, underoccupied, stage of thermalization.
[1] Heavy quark diffusion coefficient in heavy-ion collisions via kinetic theory, K. Boguslavski, A. Kurkela, T. Lappi, F. Lindenbauer, J. Peuron, arXiv:2303.12520 [hep-ph]
[2] Jet momentum broadening during initial stages in heavy-ion collisions, K. Boguslavski, A. Kurkela, T. Lappi, F. Lindenbauer, J. Peuron, arXiv:2303.12595 [hep-ph]
