1. Fcal/sFcal Pointing resolution S. DAHBI, Y. TAYALATI ( Mohamed V University Rabat) B. LUND-JENSEN ( KTH Royal Institute of Technology Stockholm ) Mohamed V University Faculty of Sciences Rabat Upgrade Plans for ATLAS Forward Calorimetry

2. Interpolate points in the graph below at Phi Measured using a linear interpolation between the two points of Phi Truth close to Phi Measured is computed using function Eval( ). The Correction way S-shape correction at 100 GeV e- at Nominal Granularity ( FCal ) S-shape correction at 100 GeV e- at Nominal Granularity ( FCal ) phiMeasuredCorrected=gr->Eval(phiMeasured); φ between 0 to 0.62 rad φ between 0 to 0.62 rad η between 3.4 to 3.5 η between 3.4 to 3.5 23/03/2016Fcal/sFcal Pointing resolution 2 a)b) c)d)

3. Variation of Pointing Phi Resolution as a function of Eta at Nominal Granularity ( FCal ) Variation of Pointing Phi Resolution as a function of Eta at Nominal Granularity ( FCal ) η between 3.4 to 3.5 η between 3.5 to 3.6 η between 3.6 to 3.7 η between 3.7 to 3.8 η between 3.8 to 3.9 η between 3.9 to 4 η between 4 to 4.1 η between 4.1 to 4.2 23/03/2016Fcal/sFcal Pointing resolution3

4. Nominal Granularity (before correction). Nominal Granularity (after correction). 23/03/2016Fcal/sFcal Pointing resolution4 Variation of Pointing Phi Resolution as a function of Eta at Nominal Granularity ( FCal ) Variation of Pointing Phi Resolution as a function of Eta at Nominal Granularity ( FCal )

5. Variation of Pointing Phi Resolution as a function of Energy at Nominal Granularity ( FCal ) Variation of Pointing Phi Resolution as a function of Energy at Nominal Granularity ( FCal ) 5 GeV 23/03/2016Fcal/sFcal Pointing resolution5 200 GeV Nominal Granularity (before correction). Nominal Granularity (after correction).

6. S-shape correction at 100 GeV e- for Fine Granularity (sFCal) S-shape correction at 100 GeV e- for Fine Granularity (sFCal) φ between 0 to 0.62 rad φ between 0 to 0.62 rad η between 3.4 to 3.5 η between 3.4 to 3.5 23/03/2016 Fcal/sFcal Pointing resolution 6 a) b) c)d)

7. Variation of Pointing Phi Resolution as a function of Eta for Fine Granularity ( sFCal ) Variation of Pointing Phi Resolution as a function of Eta for Fine Granularity ( sFCal ) η between 3.4 to 3.5 η between 3.5 to 3.6 η between 3.6 to 3.7 η between 3.7 to 3.8 η between 3.8 to 3.9 η between 3.9 to 4 η between 4 to 4.1 η between 4.1 to 4.2 23/03/2016Fcal/sFcal Pointing resolution7

8. Fine Granularity (before Correction). Fine Granularity (after Correction). 23/03/2016Fcal/sFcal Pointing resolution8 Variation of Pointing Phi Resolution as a function of Eta for Fine Granularity ( sFCal ) Variation of Pointing Phi Resolution as a function of Eta for Fine Granularity ( sFCal )

9. Variation of Pointing Phi Resolution as a function of Energy for Fine Granularity ( sFCal) Variation of Pointing Phi Resolution as a function of Energy for Fine Granularity ( sFCal) 5 GeV 200 GeV 23/03/2016Fcal/sFcal Pointing resolution9 Fine Granularity (before correction). Fine Granularity (after correction).

10. CONCLUSION CONCLUSION The pointing resolution in phi for Electrons is clearly better in sFCal than Fcal Applying S-shape corrections improves the resolution significantly. 23/03/2016 10 Nominal Granularity (FCal). Fine Granularity (sFcal). Fcal/sFcal Pointing resolution