1. RICH upgrade simulation: updates 11-2-2015 RICH upgrade-software meeting 1 S.Easo

2.  Updates from LHCb tracking, PID algorithm  RICH 1 Optics : Fine tuning spherical mirror ROC  Plans : Evolutions of MAPMT array configurations Outline 2

3. LHCb Tracking 2012-13 (TDR studies): No ‘upgrade tracking’ available for RICH studies Used current LHCb tracking geometry + different versions of RICH upgrade geometry Not a perfect, but a practical solution at the time.  2014 : ‘Upgrade tracking’ became available, so started using it for RICH. 2014 Feb : Upgrade/current tracking comparisons in terms of PID. Track quality parameters were not available. So assumed all long tracks are ‘good tracks’ as a first step.  2015 : Track ghost probability parameter available, Used this to filter the upgrade tracks used for RICH.  This talk: PID with some of the above tracking setups. They all use same PYTHIA (generator) and beam configurations. So expect only minor variations of PID performance among them. RICH performance depends on the tracks input to RICH. 3

4. Simulation Configuration  Gauss v47r0p1, Boole 29r3, Brunel v47r4  Tracking : Recent version as in Brunel v47r4 for upgrade/current LHCb  Luminosity : Lumi20 ( 2X 10 34 cm 2 s -1 ), no spillover  B s   events  RICH Optics: 4 ROC 3800 mm, 3600 mm, 3650 mm With/without photon plane shift of 100 mm. Current standard setup in software: ROC 3800mm, no plane shift RICH2 : large+ small pmts  PID Tuning: Current/Old tuning. Current tuning is default.  Several PID combinations: Different Tracking/PID Tuning/RICH Optics. Only a few combinations used in this presentation

5. Red: Upgrade LHCb Tracking + Tracks selected with ghost probability cut Blue: Upgrade LHCb Tracking + All tracks Black: Current LHCb Tracking + Tracks selected with ghost probability cut PID from Upgrade LHCb tracking improved compared to that from Current LHCb tracking RICH1: standard setup 5

6. 6 RICH1 optics “out of focus” Red: Upgrade LHCb Tracking + Tracks selected with ghost probability cut Cyan: Upgrade LHCb Tracking + All tracks Black: Current LHCb Tracking + Tracks selected with ghost probability cut RICH1 optics: ROC= 3600 mm PID from Upgrade LHCb tracking improved compared to that from Current LHCb tracking, for all optics

7. 7 Upgrade tracking, ghost probability< 0.3 Red: RICH1 ROC 3800 mm Black: RICH1 ROC 3800 mm, photon plane shift 100 mm Blue: RICH1 ROC 3600mm, photon plane shift 100 mm Cyan : RICH1 ROC 3650 mm, photon plane shift 100 mm Effect from photon plane shift recovered by change in ROC upgrade PID plots wth ‘recent best configuration’

8. 8 Current LHCb tracking Red: RICH1 ROC 3800 mm Black: RICH1 ROC 3800 mm, photon plane shift 100 mm Blue: RICH1 ROC 3600mm, photon plane shift 100 mm Upgrade tracking, : All tracks Effect from photon plane shift recovered by change in ROC This conclusion on optics obtained, independent of the tracking used.

9. Effects from PID tuning Some tuning done in 2013 Now re-visiting with current versions For illustration use tracks with 7.5 < P < 100 GeV/c on this page. (backup slide with full P range). Blue: Current tuning Magenta: Old Tuning All Plots:RICH1 ROC=3800 mm using upgrade tracking Top Plot: Standard setup, no shift in photon plane Bottom plot: Photon plane shift=100 mm Tuning gave a small improvement in PID performance in both plots

10. 10 Optics and PID tuning : Upgrade LHCb Tracking Upgrade LHCb Tracking, Current PID Tuning Upgrade LHCb Tracking Old PID Tuning Effect from photon plane shift recovered by change in ROC This conclusion on optics obtained, is independent of the PID tuning used with Upgrade LHCb tracking Red: RICH1 ROC 3800 mm Black: RICH1 ROC 3800 mm, photon plane shift 100 mm Blue: RICH1 ROC 3600mm, photon plane shift 100 mm

11. 11 Optics and PID tuning : Current LHCb Tracking Current LHCb Tracking, Current PID Tuning Current LHCb Tracking Old PID Tuning Effect from photon plane shift recovered by change in ROC This conclusion on optics obtained, is independent of the PID tuning used with Current LHCb tracking Red: RICH1 ROC 3800 mm Black: RICH1 ROC 3800 mm, photon plane shift 100 mm Blue: RICH1 ROC 3600mm, photon plane shift 100 mm

12. 12 Plans Once the exact ROC is decided, freeze the optics geometry for a while. Long term: Rebuild the PMT arrays in software, using the Elementary Cells. Further tuning of the PID algorithm

13. 13 SUMMARY  PID performance verified with different tracking and PID tuning combinations.  The usage of ghost probability gives a minor improvement in PID performance  All the PID performances obtained are consistent with each other and are as expected.

14. BACKUP SLIDES 14

15. 15 PID vs Momentum Upgrade tracking, ghost probability <0.3 RICH standard setup (ROC 3800 mm) Current LHCb tracking, ghost probability <0.3 RICH standard setup (ROC 3800 mm)

16. 16 PID vs Momentum Upgrade tracking, All tracks RICH standard setup (ROC 3800 mm) Upgrade tracking, All tracks RICH standard setup (ROC 3800 mm) Old PID tuning

17. Red: Upgrade LHCb Tracking + Tracks selected with ghost probability cut Cyan: Upgrade LHCb Tracking + All tracks Black: Current LHCb Tracking + Tracks selected with ghost probability cut RICH1 optics “out of focus” PID from Upgrade LHCb tracking improved over that from Current LHCb tracking 17

18. Red: Upgrade LHCb Tracking + Tracks selected with ghost probability cut Cyan: Upgrade LHCb Tracking + All tracks Black: Current LHCb Tracking + Tracks selected with ghost probability cut PID from Upgrade LHCb tracking improved over that from Current LHCb tracking RICH1 optics: ROC= 3600 mm 18

19. Red: RICH1 ROC 3800 mm Black: RICH1 ROC 3800 mm, photon plane shift 100 mm Blue: RICH1 ROC 3600mm, photon plane shift 100 mm PID has same trend as in upgrade tracking Current LHCb tracking 19

20. 20 Red: RICH1 ROC 3800 mm Black: RICH1 ROC 3800 mm, photon plane shift 100 mm Blue: RICH1 ROC 3600mm, photon plane shift 100 mm Cyan : RICH1 ROC 3650 mm, photon plane shift 100 mm Upgrade tracking, All tracks

21. Effects from PID tuning Some tuning done in 2013 Now re-visiting with current versions For illustration use tracks with 1.5 < P < 100 GeV/c on this page. Blue: Current tuning Magenta: Old Tuning All Plots:RICH1 ROC=3800 mm Top Plot: No shift in photon plane Bottom plot: Photon plane shift=100 mm Tuning improved the PID in general, apart from very low momentum tracks below 7.5 GeV/c. So a minor retuning for this in the future.

22. Black: Current LHCb tracking Green/Blue: Upgrade LHCb tracking Blue: Upgrade tracking + RICH2 ‘all small’ PMTs Red: Upgrade tracking + RICH2 mixed PMTs Red : used as ‘reference plot’ in Dec 2014. Recapitulation