The output trees are organized into two main parts. Information about the generated events and information collected at sensitive detectors/flux planes.
evNpart will be a scaler that defines the size of each of the subsequent arrays with the exception of evAsym which will is the analyzing power for the moller scattering event. Note: In the case of a beam simulation evAsym would be recorded as zero.
To extract the information about the Z position of the vertex for the who particles we would access evVz[0] or evVz[1].
| Branch Name | Description |
|---|---|
| evNpart | number of generated particles |
| evPid | Geant4 particle type |
| evVx | creation vertex, lab frame [m] |
| evVy | creation vertex, lab frame [m] |
| evVz | creation vertex, lab frame [m] |
| evP | Particle initial momentum [GeV] |
| evPx | Particle initial momentum components, lab frame [GeV] |
| evPy | Particle initial momentum components, lab frame [GeV] |
| evPz | Particle initial momentum components, lab frame [GeV] |
| evTh | Particle initial polar angle [rad] |
| evPh | Particle initial azimuthal angle [rad] |
| evThcom | Particle initial polar angle in CM frame |
| evPhcom | Particle initial azimuthal angle in CM frame |
| evAsym | Azz calucated |
hitN is a scalar that defines (to you) the size of each of the arrays that contain information about a particle as it passed through a flux plane or hit a detector. Let's suppose two particles passed through 14 planes and each hit the detector; in this case, there would be 15 entries for each particle so hitN would be 30. Each recorded hit will tell you which detector hitDet and the information about the particle as it passed through a particular detector or flux plane.
| Branch Name | Description |
|---|---|
| hitN | Number of hits for the event, number of electrons emitted |
| hitDet | Detector number |
| hitVid | Volume ID number (not yet implemented) |
| hitPid | Geant4 particle type |
| hitTrid | Geant4 track ID number (1 = first particle created) |
| hitMtrid | Geant4 mother track ID number (0 = particle from gun) |
| hitX | Hit X coordinate, lab frame [m] |
| hitY | Hit Y coordinate, lab frame [m] |
| hitZ | Hit Z coordinate, lab frame [m] |
| hitLx | Hit Local X coordinate, lab frame [m] |
| hitLy | Hit Local X coordinate, lab frame [m] |
| hitLz | Hit Local X coordinate, lab frame [m] |
| hitP | Momentum magnitude of particle [GeV] |
| hitPx | Momentum X-component of particle, lab frame [GeV] |
| hitPy | Momentum Y-component of particle, lab frame [GeV] |
| hitPz | Momentum Z-component of particle, lab frame [GeV] |
| hitVx | Creation X-coordinate of vertex of particles |
| hitVx | Creation Y-coordinate of vertex of particles |
| hitVx | Creation Z-coordinate of vertex of particles |
| hitE | Energy of particle [GeV] |
| hitM | Mass of particle [GeV] |
Information on the detector numbering system can be found in the main README.md file.