Lorentz beta for improved scattering calculation
Improved Highland formula to account for particle charge number and Lorentz beta factor.
Tested with data from protons and deuterons 80-200 MeV kinetic energy (300-700 MeV/c).
With beta = 1
the kink angles are underestimated (even by up to 40%) for low momentum particles.
Usage of correct beta (eg: protons at 80MeV have a beta ~ 0.4
) also leads to a better track chi2 mean and stddev.
If nothing is specified, it treats everything as highly relativistic.