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tudo-astroparticlephysics / PROPOSAL

Monte Carlo Simulation propagating charged Leptons through Media as C++ Library
GNU Lesser General Public License v3.0
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Add LPM effect for photopair, fixes for BremsLPM #336

Closed Jean1995 closed 1 year ago

Jean1995 commented 1 year ago

New PR for #334 but with clean history.

This PR adds the LPM effect for pair production of electron-positron pairs by photons.

Furthermore, this PR fixes the following issues in the implementation of the LPM effect in Bremsstrahlung:

  1. An inconsistent definition of eLPM has been fixed
  2. A more general definition of s1 is now used, to that the BremsLPM parametrization is not only valid for muons, but also for other particles (electrons/positrons/taus)
Jean1995 commented 1 year ago

Enclosed are some exemplary comparisons of Bremsstrahlung dEdx between this PR and the current master:

brems_MuMinus_ice

brems_EMinus_lead

brems_TauMinus_ice

Jean1995 commented 1 year ago

As an additional validiation, I have created plots where I compare the new dEdx results to the results from Polityko et al:

brems_MuMinus_iron

brems_MuMinus_water

Note that the energies used in their paper only go up to 1e18 MeV, but it is sufficient to see that the agreement is now much better.