Charge reco efficiency for 40 GeV e- using 6-disk FGT as on December 2007
Updated: December 15,2007

Assumptions about resolution of detectors.
* Use: Vertex, IST1+2, SSD, 6-disk FGT, truncated TPC(nHit>=5), ESMD

detector	assumed resolution	weight of the point	Remarks
vertex	200 mu m in X,Y 30 cm in Z	W=1/(200 mu m)^2	added as a hit
IST1	20 mum in r*phi 0.5 mm in Z	W=1/(20 mu m)^2	-
IST2	0.5 mm in r*phi 20 mum in Z	W=1/(0.5 mm)^2	-
SSD	20 mum in r*phi 1 mm in Z	W=1/(20 mu m)^2	-
FGT	60 mu m in X,Y 1 mm in Z	W=1/(60 mu m)^2	6 disks hit reco eff=100%
TPC	1 mm along arc 1 mm in Z	W=1/(1mm)^2 nHit>=5	* drop padrow #1 and #13 * drop hits at \|Z\|>197 cm * drop all hits if below 5
Endcap SMD mock hit **)	1.5 mm in X,Y 5mm in Z	W=1/(1.5 mm)^2	at xPoint of Geant helix w/ SMD plane

Quality of the reco 3D tracks (fit of circle+line) is defined based on a difference of the reco direction of primary track at the vertex vs. Geant track direction.
Track reco efficiency is defined as the ratio of# of reco tracks (N1) w/
* nFitP>=5, including vertex as a hit
* delPhi<3 mrad
* delTheta <3 mrad
to the # of generated electrons (N0).
Charge reco efficiency requiers additinal
* the sign of the reco charge is correct. Track counter is N2.
No cut on reco pT is imposed.
Sketch of possible FGT gometries, each consisting of 6 disks.
* 'large-layout', disks encoded in UPGR13, Z₁=60,..., Z₆=150cm, D_Z=18 cm, R_in=7.5cm, R_out=43 cm
* 'realistic-layout', disks drawn in magenta, Z₁=60,..., Z₆=120cm, D_Z=10 cm, R_in=~11.5cm, R_out=~38 cm
* 'compact-layout', disks drawn in green, Z₁=60,..., Z₆=120cm, D_Z=10 cm, R_in=~20cm, R_out=~38 cm
Hits distribution, track, charge reco efficiencies for single electrons with ET of 40 GeV.
1. DETAILS of : Z₁=70,..., Z₆=150cm, D_Z=16 cm, R_in=11.5cm, R_out=37.6 cm
2. DETAILS of : Z₁=70,..., Z₆=120cm, D_Z=10 cm, R_in=11.5cm, R_out=37.6 cm
3. DETAILS of : Z₁=70,..., Z₆=120cm, D_Z=10 cm, R_in=18cm, R_out=37.6 cm
4. DETAILS of : Z₁=110,..., Z₆=160cm, D_Z=10 cm, R_in=11.5cm, R_out=37.6 cm