Subdetector Enumerator Mapping

In the TrackerGeometry each GeomDet has a type from which it is possible to obtain the subdetector. The subdetector is coded according to the GeomDetEnumerators::SubDetector enumerators in the Geometry/CommonDetUnit package. They contains all the possible Tracker subdetectors for the present and upgraded detector. In the process of building the TrackerGeometry object from the GeometricDet tree (created by the code in the Geometry/TrackerNumberingBuilder package) the GeometricDet::GDEnumType enumerators are mapped onto the GeomDetEnumerators::SubDetector enumerators. In some cases the Tracker subdetector GeomDetEnumerators::SubDetector enumerators have to be mapped to the first six enumerators because they are used as index for vectors and arrays of six elements. This is achieved with the map GeomDetEnumerators::subDetGeom[GeomDetEnumerators::SubDetector id] which returns one of the first six enumerators. To simplify the conditional statements based on the value of the GeomDetEnumerators::SubDetector enumerators, a few helper methods are available (and other can be added if needed): GeomDetEnumerators::isBarrel(subdet), GeomDetEnumerators::isEndcap(subdet), GeomDetEnumerators::isTrackerPixel(subdet), GeomDetEnumerators::isTrackerStrip(subdet) and equivalent methods in the GeomDetType class. The present map between enumerators and the returned values of the above methods are summarized in the table below:

GeometricDet::GDEnumType	GeomDetEnumerators::SubDetector	GeomDetEnumerators::subDetGeom[id]	isTrackerPixel	isTrackerStrip	isBarrel	isEndcap
PixelBarrel	PixelBarrel	PixelBarrel	true	false	true	false
PixelEndCap	PixelEndcap	PixelEndcap	true	false	false	true
TIB	TIB	TIB	false	true	true	false
TID	TID	TID	false	true	false	true
TOB	TOB	TOB	false	true	true	false
TEC	TEC	TEC	false	true	false	true
PixelPhase1Barrel	P1PXB	PixelBarrel	true	false	true	false
PixelPhase1EndCap	P1PXEC	PixelEndcap	true	false	false	true
PixelPhase2EndCap	P2PXEC	PixelEndcap	true	false	false	true
OTPhase2Barrel	P2OTB	TOB	true	false	true	false
OTPhase2EndCap	P2OTEC	TID	true	false	false	true

TrackerGeometry useful methods

Since the GeomDet are not always available, two help methods are available: TrackerGeometry::geomDetSubDetector(int i) which returns the value of the GeomDetEnumerators::SubDetector enumerator which correspond to the DetId subdetector i, and TrackerGeometry::numberOfLayers(int i) which returns the number of layers of the DetId subdetector i. The values of these methods for the three scenarios available so far are described in the tables below. In addition the method TrackerGeometry::isThere(GeomDetEnumerators::SubDetector subdet) can be used to test if the geometry contains the subdetector subdet.

• Present detector

DetId::subDetId()	TrackerGeometry::geomDetSubDetector(subdet)	TrackerGeometry::numberOfLayers(subdet)
1	GeomDetEnumerators::PixelBarrel	3
2	GeomDetEnumerators::PixelEndcap	2
3	GeomDetEnumerators::TIB	4
4	GeomDetEnumerators::TID	3
5	GeomDetEnumerators::TOB	6
6	GeomDetEnumerators::TEC	9

• Phase1 Tracker

DetId::subDetId()	TrackerGeometry::geomDetSubDetector(subdet)	TrackerGeometry::numberOfLayers(subdet)
1	GeomDetEnumerators::P1PXB	4
2	GeomDetEnumerators::P1PXEC	3
3	GeomDetEnumerators::TIB	4
4	GeomDetEnumerators::TID	3
5	GeomDetEnumerators::TOB	6
6	GeomDetEnumerators::TEC	9

• Phase2 Tracker

DetId::subDetId()	TrackerGeometry::geomDetSubDetector(subdet)	TrackerGeometry::numberOfLayers(subdet)
1	GeomDetEnumerators::P1PXB	4
2	GeomDetEnumerators::P2PXEC	10
3	GeomDetEnumerators::invalidDet	0
4	GeomDetEnumerators::P2OTEC	5
5	GeomDetEnumerators::P2OTB	6
6	GeomDetEnumerators::invalidDet	0