Hit Structure proposed for the DCH collection of hits in BOGUS
(Ernesto Lamanna, Caterina Perri)
The definition of the HIT structure in BgsDchSim must take into account the main characteristics of the selected model geometry.
The layer geometry model and the G4navigator track the particles in the Drift Chamber crossing each layer surface and computing the information stored in the hit.
Some requirements associated to the downstream module which includes the fast fit to make track reco like objects, BgsDchReco, must be also considered.
The parameters collected in the following table will be estimated using the particle intersection points with the layer surfaces.
New Layer Hit structure
| Number |
Information |
Name |
Type |
| 1 |
X point of intersection (track - layer surface containing the sense wires) |
xPosition |
G4double |
| 2 |
Y point of intersection (track - layer surface containing the sense wires) |
yPosition |
G4double |
| 3 |
Z point of intersection (track - layer surface containing the sense wires ) |
zPosition |
G4double |
| 4 |
px at the intersection point |
px |
G4double |
| 5 |
py at the intersection point |
py |
G4double |
| 6 |
pz at the intersection point |
pz |
G4double |
| 7 |
layer number |
layer |
G4int |
| 8 |
cell number |
cell |
G4int |
| 9 |
HEP particle id |
particleId |
G4int |
| 10 |
Track number |
track |
G4int |
| 11 |
path between two layer surface intersactions |
path |
G4double |
| 12 |
energy loss |
energyLoss |
G4double |
| 13 |
Number of crossed radiation length |
crossedRadLeng |
G4double |
| 14 |
Distance of the intersaction point from the sense wire (on the layer surface) |
wireDistance |
G4double |
| 15 |
Intrinsic Resolution |
resolution |
G4double |
| 16 |
Layer stereo angle |
stereoAngle |
G4double |
| 17 |
Layer dip angle |
dipAngle |
G4double |
The 16th and 17th parameters can be estimated in the downstream module. |
