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README.hitdet.md

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Selecting hits from certain detectors

All sensitive detectors are represented internally by a positive integer.

Although this is not a requirement by Geant4 (which assigns a name to the sensitive detectors), having an integer make it easier to store hits in a flat tree with a single integer variable representing the detector. This then allows:

T->Draw("hit.y:hit.x","hit.pid < 20")

Obtaining a listing of all detector numbers

The full listing of detector numbers can be obtained with a macro

build/remoll macros/printgeometry.mac

The number in square brackets at the end of the line indicates the detector number for those volumes. If there is no number in square brackets, that means that the volume does not have a sensitive detector associated with it.

Using volume name aliases for the detector numbers

To connect the numbers to more human readable detector names it is also possible to use convenient aliases in the output tree:

T->Draw("hit.y:hit.x","hit.pid == dets.lv.logicDScoll_5")
T->Draw("hit.y:hit.x","hit.pid == dets.sd.pionLuciteDet")

In the first case (dets.lv) the logical volume name is used. In the second case (dets.sd) the sensitive detector name is used.