Question: How much charge & pT reconstruction depends on accuracy of E-SMD hit.

1. General method: as desribed here, geometry UPGR12,

2. electrons w/ pt=30 GeV/c.

3. Tracking uses: FST+FGT+TPC+ESMD, no Vertex

4. Used detector configurations:
   * config=D : vert=yes, FST=1+4, FGT=1+3, ESMD=yes (for reference)
   * config=H : vert=no, FST=1+4, FGT=1+3, ESMD=yes
   * config=J : vert=no, FST=1..4, FGT=1..3, ESMD=yes
   * config=A : vert=yes, FST=1..4, FGT=1..4, ESMD=yes (for reference)

5. Charge reco efficiency is defined as the ratio of # of generated electrons to # of reco tracks w/
   * nFitP>=5
   * delPhi<3 mrad (at z=gVert)
   * delTheta <3 mrad (at z=gVert)
   * the sign of the reco charge is correct

6. Resulting charge reco efficiency for electrons w/ pt=30 GeV/c.
   TPC are used in all configurations.

   	Config D: vert=yes, FST=1+4, FGT=1+3, ESMD=yes	Config H: vert=no, FST=1+4, FGT=1+3, ESMD=yes	--	Config J: vert=no, FST=1..4, FGT=1..3, ESMD=yes	Config A: vert=yes, FST=1..4, FGT=1..4, ESMD=yes
   phi cut 3 mrad			.
   theta cut 3 mrad			.
   charge eff			.
   	Config D: vert=yes, FST=1+4, FGT=1+3, ESMD=yes	Config H: vert=no, FST=1+4, FGT=1+3, ESMD=yes	--	Config J: vert=no, FST=1..4, FGT=1..3, ESMD=yes	Config A: vert=yes, FST=1..4, FGT=1..4, ESMD=yes

7. Conclusions (How important is vertex hit?, compare config H vs. D or J vs. A )
   1. The apparent drop of charge reco efficiency to ~60% for zVertex [-30,0] cm results from poor tracking model ignoring HFT, IST, and SSD hits. Such tracks often miss also both FST & FGT ( see item #4 here). If we drop the vertex hit one ends up only w/ TPC+SMD hits.
      All this work needs to be redone after all inner trackers are in the reco algo.
   2. For zVertex=+30 cm (blue): sizable loss of charge reco efficiency for eta [1.2,1.5] , this will improve once FST,FGT are moved in Z & Rxy.
   3. For zVertex=+0 cm (green): small (~10%) loss of charge reco efficiency for eta [1.5,2.0] , for smaller eta model is inadequate
   4. For zVertex=-30 cm (green): this model is inadequate