Ionisation loss in extrapolator (was ACTS-481)
Original author Fabian Klimpel @fklimpel
The implemented formulas in the extrapolated for the energy loss due to ionisation are given by http://pdg.lbl.gov/2014/reviews/rpp2014-rev-passage-particles-matter.pdf
Eq. 32.5 is used for the reconstruction and eq. 32.11 for simulation. Eq. 32.12 provides a simpler form for the simulation than eq. 32.11. for the case of \beta\gamma\gtrapprox 100. The necessary parameters for the evaluation of this eq. are already given and might speed up the simulation.
It should be investigated if this is the case and if the approximation delivers comparable results to eq. 32.11 in the given regime