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Lorentz beta for improved scattering calculation

Mihail Bogdan Blidaru requested to merge mblidaru/corryvreckan:beta_factor into master

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.

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