L1 Trigger Rate Study

1. L1 Trigger Rate Study Nathaniel Amos

2. GMT Eta Distribution • Studied Eta distribution of GMT output to estimate GMT Rate in η • Data sample taken from: • Runs: 190389-194115 • HLT_L1SingleMu12 and json_MuonPhys.txt • GMT Qualities selected: • GMT Quality 5: RPC Only • GMT Quality 6: DT or CSC, No RPC • GMT Quality 7: DT/RPC or CSC/RPC

3. GMT Eta Distribution -Over 700 counts from each spike Spikes η

4. What causes the spikes? • Observe each subsystem independently • All track matching done manually between GMT and subsystem • Define ∆R2=∆φ2 + Δη2 • Require ∆R < 0.05 • Take GMT-DT matches at GMT Quality 6, 7 • Take GMT-CSC matches at GMT Quality 6, 7 • If GMT η > 2.1, require CSCTF Mode 5 • Take RPC-GMT matches at GMT Quality 5, GMT BX = 0 • Plot each Eta distribution

5. ∆R Distributions DT Overlap DT Only Most ∆R < 0.05 Most ∆R < 0.05 CSC Overlap CSC Only Most ∆R < 0.05 Many ∆R > 0.05?

6. ∆R Distributions Already matched from DT, where ∆R<0.05. Remove these from CSC Overlap. NEW CSC Overlap without already matched DT tracks. Most ∆R < 0.05

7. GMT-CSC Matches at 5 ≤ Quality ≤ 7 No large spikes observed at |η| = 1.0 η

8. GMT-RPC Matches at Quality = 5 η

9. GMT-DT Matches at 5 ≤ Quality ≤ 7 Spikes η

10. GMT Relative Rates • Plot number of GMT-subsystem matches relative to total number of GMT matches • Partition η into regions: • DT, |η| < 0.9 • GMT Quality 6 and Quality 7 • CSC, 1.2 < |η| < 2.1 • GMT Quality 6 and Quality 7 • Also choose 1.2 < |η| < 2.0 (See next slides) • RPC, |η| < 1.6 • DT Overlap, 0.9 < |η| < 1.2 • CSC Overlap, 0.9 < |η| < 1.2

11. Two Types of Plots • Plot GMT-subsystem matches divided by total number of GMT matches (“Relative Rates”) • Plot GMT-subsystem matches divided by total number of GMT matches per subsystem region width (a type of rate density) • Example: • CSC (1.2 < |η| < 2.1): each η bin has width of η = 0.1 • Therefore CSC Relative Rates divided by 18 bins

12. Relative Rates, |η| < 2.1 60% of the GMT matches come from the CSCs.

13. Relative Rates Per Region Width,|η| < 2.1 Spikes in overlap region from DT each come in a single bin (η = ±1.0) DT overlap region produces much greater contribution per bin.

14. Relative Rates, |η| < 2.0 For |η|<2.0, CSCs contribute 20% of GMT tracks (outside overlap region). A lot of rate comes from extra η bin at ±2.1 (maybe from ME1/1 A station).

15. Relative Rates Per Region Width, |η| < 2.0 Full region reduced from |η| < 2.1 to |η|< 2.0, CSCs contribute much less rate. DT Overlap’s spikes very apparent.

16. Current Efficiency Efficiency about 96% at |η|=1.0

17. Potential Efficiency: Ignore DT in Overlap Region Efficiency between 85% and 95% at η≈1.0. About 90% on average.

18. Conclusions • Spikes do not come from CSC • But, a lot of rate at 2.0 <|η| < 2.1 • Some tracks may come from ME 1/1A • DT in overlap region causes spikes • Appears to be η = ±1.0 • If ignore DT in overlap region: • Efficiency drops from 96% to 90% • NOTE: Using only CSC, about 12% of tracks will be lowest CSCTF Quality • Rate consequences not fully understood • Maybe need GMT Emulator?

19. Backup

20. GMT-CSC Matches at Quality = 6 No large spikes observed at |η| = 1.0 η

21. GMT-CSC Matches at Quality = 7 No large spikes observed at |η| = 1.0 η

22. GMT-DT Matches at Quality = 6 Spikes η

23. GMT-DT Matches at Quality = 7 η