Change Details

This task is for implementing tau decays in EvtGen using the Helicity Matrix Element (HME) decay amplitude model in Pythia, which keeps particle spin information. We can then remove all TAUOLA-based code. Code development should use the `tauPythia` branch. The decay model is called `EvtHmePythia` which uses the `EvtPythiaEngine`, both defined in the `EvtGenExternal` source and header file directories. The `EvtPythiaEngine::hmeAmplitudes()` method needs the `initWaves()` function in `pythia8/include/Pythia8/HelicityMatrixElements.h`to be made public (instead of being protected).

This task is for implementing tau decays in EvtGen using the Helicity Matrix Element (HME) decay amplitude model in Pythia, which keeps particle spin information. We can then remove all TAUOLA-based code. Code development should use the [[ https://phab.hepforge.org/source/evtgen/history/tauPythia/ | tauPythia ]] branch. The decay model is called `EvtHmePythia` which uses the `EvtPythiaEngine`, both defined in the `EvtGenExternal` source and header file directories. The `EvtPythiaEngine::hmeAmplitudes()` method needs the `initWaves()` function in `pythia8/include/Pythia8/HelicityMatrixElements.h`to be made public (instead of being protected).

This task is for implementing tau decays in EvtGen using the Helicity Matrix Element (HME) decay amplitude model in Pythia, which keeps particle spin information. We can then remove all TAUOLA-based code. Code development should use the `[[ https://phab.hepforge.org/source/evtgen/history/tauPythia/ | tauPythia` ]] branch. The decay model is called `EvtHmePythia` which uses the `EvtPythiaEngine`, both defined in the `EvtGenExternal` source and header file directories. The `EvtPythiaEngine::hmeAmplitudes()` method needs the `initWaves()` function in `pythia8/include/Pythia8/HelicityMatrixElements.h`to be made public (instead of being protected).