General event variables:
One value per event
- runNumber (int)
Same for all events in one run - eventNumber (int)
Starting at 0 and going to number of events -1 - eventTime (float)
BIF timestamp in unix time - ahc_iEvt (int)
Starting at 1 and going to number of events (cross-check for eventNumber) - ahc_nHits (int)
Number of hits per event - ahc_nLayers (int)
Needs work: currently 100 for all events, meant to be the available number of layers from database - ahc_energySum (float)
Summed up energy of all hits above threshold per event in MIP:
ahc\_energySum = \sum_{i=0}^{ahc\_nHits - 1} ahc\_hitEnergy_i - ahc_energyDensity (float)
Energy of all hits in event divided by tile surface in MIP/mm2
ahc\_energyDensity = \sum_{i=1}^{ahc\_nLayers} \left( \sum_{j=0}^{ahc\_nHitsPerLayer_i -1} \frac{ahc\_hitEnergy_j}{{ahc\_cellSize_j}^2} \right) - ahc_radius (float)
Mean shower radius of an event in mm
ahc\_radius = \frac{\sum_{i=0}^{ahc\_nHits - 1} ahc\_hitRadius_i}{ahc\_nHits} - ahc_radiusEw (float)
Mean energy weighted shower radius using the layer-wise center of gravity in X and Y in mm
ahc\_radiusEw = \frac{\sum_{i=1}^{ahc\_nLayers} \left( \sum_{j=0}^{ahc\_nHitsPerLayer_i-1} \frac{ahc\_hitEnergy_j}{{ahc\_cellSize_j}^2} \cdot \sqrt{{ \left( ahc\_cogXPerLayer_i-ahc\_hitPos[0]_j \right) }^2 + { \left( ahc\_cogYPerLayer_i-ahc\_hitPos[1]_j \right) }^2} \right)}{ahc\_energyDensity} - ahc_cogX (float)
Center of gravity of event in X (perpendicular to beam axis) in mm with respect to the center of the detector
ahc\_cogX = \frac{\sum_{i=0}^{ahc\_nHits - 1} ahc\_hitPos[0]_i \cdot ahc\_hitEnergy_i}{ahc\_energySum} - ahc_cogY (float)
Center of gravity of event in Y (perpendicular to beam axis) in mm with respect to the center of the detector
ahc\_cogY = \frac{\sum_{i=0}^{ahc\_nHits - 1} ahc\_hitPos[1]_i \cdot ahc\_hitEnergy_i}{ahc\_energySum} - ahc_cogZ (float)
Center of gravity of event in Z (in beam direction) in mm with respect to the beginning of the first layer
ahc\_cogZ = \frac{\sum_{i=0}^{ahc\_nHits - 1} ahc\_hitPos[2]_i \cdot ahc\_hitEnergy_i}{ahc\_energySum}
Layer-wise event variables:
Array of size of ahc_nLayers per event
- ahc_energyPerLayer (float)
Energy sum of all hits in one layer per event in MIP - ahc_energyPerLayer_err (float)
Needs work: not yet saved in slcio files - ahc_nHitsPerLayer (int)
Number of hits in one layer per event - ahc_cogXPerLayer (float)
Center of gravity in X direction in mm in one layer per event - ahc_cogYPerLayer (float)
Center of gravity in Y direction in mm in one layer per event - ahc_radiusPerLayer (float)
Mean shower radius of an event in mm per layer - ahc_radiusEwPerLayer (float)
Mean energy weighted shower radius of an event per layer in mm
Hit variables:
Array of size of ahc_nHits per event
- ahc_hitEnergy (float)
Pedestal-subtracted and MIP-calibrated energy of the hit - ahc_cellSize (int)
Side length of hit scintillator tile in mm - ahc_hitPos (float)
3 arrays of size ahc_nHits, one each for X, Y and Z: ahc_hitPos[0] is the position in X direction, ahc_hitPos[1] is Y, ahc_hitPos[2] is Z
Hit position in mm in X, Y and Z with respect to the center of the detector (for X, Y) or the beginning of the first layer (for Z) - ahc_hitI (int)
Number of hit scintillator tile in X direction (going from 1 to 24) - ahc_hitJ (int)
Number of hit scintillator tile in Y direction (going from 1 to 24) - ahc_hitK (int)
Number of hit scintillator tile in Z direction (corresponds to the layer number, going from 1 to ahc_nLayers) - ahc_hitCellID (int)
Encoded IJK information of the hit - ahc_hitRadius (float)
Radial distance from center of gravity of event in x and y in mm
ahc\_hitRadius = \sqrt{{\left( ahc\_cogX - ahc\_hitPos[0] \right)}^2+{\left( ahc\_cogY - ahc\_hitPos[1] \right)}^2} - ahc_hitEnergyDensity (float)
Hit energy divided by surface of hit scintillator tile in MIP/mm2
ahc\_hitEnergyDensity = \frac{ahc\_hitEnergy}{{ahc\_cellSize}^2} - ahc_hitType (int)
Definition: GainBit*100 + memoryCell
Information on high gain (1) / low gain (0) and memory cell (0 to 15) - ahc_hitTime (float)
reference-subtracted and ns-calibrated time of the hit
5-layer variables:
- Variables for first five layers
- Only counts hits outside a radius of 280mm except for the center of gravity calculation