1. 1 ttbar events with Atlantis   Tops back to back in the transverse plane, but objects in the barrel apart from c-jet (Extended tile)   Big activity in endcaps (|  >1.4) !   Objects well separated, apart from b-jet1 and s-jet   Ex: tt  Wb Wb  e e b csb (Evt #10 in first file of #5200 with 11.0.41)  p T miss el b2 b1 b2 b1 s el c b2 b1 el p T miss TruthE (GeV) p T (GeV)  (deg) Elec.1391140.66177 b1113109-0.2-20 b2123104-0.42176 c230122-1.252 s136102-0.8-32 87 0.03155 c s s c z 

2. 2 Primary vertex X-Y plane p T > 5 GeV   Transverse plane: Primary vertex displaced by 10  m, precision ± 20  m   z: Primary vertex displaced by 3 cm, precision ± 2 mm   Pb: 4 particles (3 , 1  ) originated from the MC vertex. FSR from jets? Reconstructed tracks Monte Carlo tracks e e  Detector center Rec. vertex Monte Carlo vertex Rec. vertex Detector center  -Z plane p T > 5 GeV Monte Carlo vertex X y 20  m 50 mm ρ z  p    p    e e TruthE (GeV) p T (GeV)  (deg) Elec.1391140.66177 b1113109-0.2-20 b2123104-0.42176 c230122-1.252 s136102-0.8-32 87 0.03155

3. 3 B tagging X-Y pT > 5 GeV X-Y (j1) pT > 5 GeV X-Y (j2) pT > 5 GeV Detector center j2 j1 e 4 cm 5 mm Monte Carlo vertex j1 j2 Detector center Reconstructed tracks Monte Carlo tracks 1 cm 4 mm SV1+IP3D b-jet 19.7 b-jet 24.7 TruthE (GeV) p T (GeV)  (deg) Elec.1391140.66177 b1113109-0.2-20 b2123104-0.42176 c230122-1.252 s136102-0.8-32 87 0.03155   Nice b-jets !

4. 4 Electron ID track Pixel (3) SCT (4) TRT (27 LT+5 HT) InDet   Pixel, SCT, TRT Hits( ) on the track !   MC and ID track superimposed !   TRT Hits size= e/h identification. Electron has a lot of High Thres.(HT) Hits !   pT rec lower. Small brem ? iPatRec ? Reconstructed electron Reconstructed tracks Monte Carlo tracks p T rec (GeV)  rec  rec (deg) Elec.1050.66177 j2 j1 el TruthE (GeV) p T (GeV)  (deg) Elec.1391140.66177 b1113109-0.2-20 b2123104-0.42176 c-jet230122-1.252 s-jet136102-0.8-32 87 0.03155

5. 5 Electron, jets in calorimeters   tt  Wb Wb  e e b csb (Evt #10 in first file of #5200 with 11.0.41)   most of the jet E in the EM, expect b1, b2   Rec. ~OK, except b2 Electron b1 b2 180 900  E rec (GeV)  rec  rec (deg) Elec.1390.67177 b-jet 1118-0.18-21 b-jet 295-0.32185 c-jet233-1.222 s-jet158-0.78-31 c s TruthE (GeV) p T (GeV)  (deg) Elec.1391140.66177 b1113109-0.20-20 b2123104-0.42176 c230122-1.252 s136102-0.80-32 87 0.03155 Jet circle  R=0.4