1. ATLAS Upgrade Program Sarah Demers, US ATLAS Fellow with BNL
Yale University
2013 US LHC Users Organization Annual Meeting

2. What ATLAS vulnerabilities appear with increased luminosity and time?

3. detector detector in pile-up
What ATLAS vulnerabilities appear with increased luminosity and time?
detector
detector in pile-up

4. PHYSICS

5. PHYSICS The Standard Model Open access to new ideas and searches
Continue to test SM
Continue to use SM physics to measure efficiencies
Open access to new ideas and searches
Increase flexibility of trigger system

6. Current Work Includes:
Insertable B-Layer
Topological Trigger
Combining muon
and calorimeter objects – can make
requirements on angular distributions
masses to select signal or reject BG

7. Fast TracKer (FTK)
Electronics for global tracking on every L1 Trigger to provide
early access to tracking information at Level 2.
Main motivation: b- and t-tagging

8. FTK Efficiencies for muons and pions with respect to
truth (simulation)
and
offline reconstruction
ATLAS-TDR

9. 2018 – fb pile-up events
Phase-I

10. Phase-I
Level1 Calorimeter Trigger/Readout
Muon New Small Wheel

11. Level 1 Calorimeter Trigger: Increased Granularity

12. Level 1 Calorimeter Trigger: Increased Granularity
Current L1 Trigger Tower

13. Level 1 Calorimeter Trigger: Increased Granularity
Current L1 Trigger Tower
Full Detector Granularity

14. Level 1 Calorimeter Trigger: Increased Granularity
Current L1 Trigger Tower
Phase-II Supercell
Full Detector Granularity

15. Muon New Small Wheel (NSW)
A set of precision tracking and trigger detectors
that can work at high rates with excellent time and
spatial resolution.
ATLAS-TDR

16. Muon New Small Wheel
Low purity (currenty) in the end-cap region

17. Segment finding for a 2 TeV Z’ decaying
Muon New Small Wheel
Segment finding for a 2 TeV Z’ decaying
to a pair of muons

18. Phase-II 2024 – 203x 3000 fb-1 140 – 200 pile-up events Level 1 Track
Trigger

19. The ATLAS Tracking Chambers

20. an example upgrade layout

21. channel occupancy with 200 pile-up interactions

22. Constraints Include Access

23. From ATLAS Phase-II Letter of Intent

24. Motivation for the Track Trigger

25. Performance assumptions based on full simulation for an upgraded ATLAS detector at a High-Luminosity LHC The ATLAS Collaboration ATLAS-PUB

26. 25 GeV for electrons and muons 60 GeV for photons and taus
Performance assumptions based on full simulation for an upgraded ATLAS detector at a High-Luminosity LHC The ATLAS Collaboration ATLAS-PUB
offline cuts of
25 GeV for electrons and muons
60 GeV for photons and taus
180 GeV for Missing ET

27. Performance assumptions based on full simulation for an upgraded ATLAS detector at a High-Luminosity LHC The ATLAS Collaboration ATLAS-PUB

28. https://twiki.cern.ch/twiki/bin/view/AtlasPublic/UpgradePhysicsStudies

29. Sensitivity of ATLAS at HL-LHC to flavour changing neutral currents in top quark decays t → cH, with H → gg ATLAS-PHYS-PUB

30. Prospects for benchmark SSUY search at high luminosity with the ATLAS Detector ATL-PUB-2013-001
The 95 % CL exclusion limits (dashed) and 5-sigma discovery reach (solid)
for 300 inverse fb (red) and 3000 fb-1 (black) in the stop, neutralino-1 mass plane
assuming a stop to top and neutralino-1 decay with a branching ratio of 100 %.

31. Propoer Decay Time Resolution

32. Conclusions Physics Goals drive the ATLAS upgrade Plan
Increased Performance and Flexibility of our detector and trigger will allow us to
use SM physics to understand our detector in new machine environments
continue to Probe the Higgs Boson
search for other physics beyond the SM
respond to what we uncover at high energy!