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GMT Eta Distributions Study - Part 1: Understanding Eta Distribution Spikes

This study analyzes the causes of spikes in GMT Eta distributions by observing subsystem matches at different qualities and plotting Eta distributions. Part 2 delves into relative rate analysis of GMT matches across subsystems.

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GMT Eta Distributions Study - Part 1: Understanding Eta Distribution Spikes

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  1. L1 Trigger Rate Study Nathaniel Amos

  2. Part 1 • GMT Eta Distributions

  3. GMT Eta Distribution • Studied Eta distribution of GMT output • Can be used to estimate GMT Rate in Eta • Data sample taken from: • Runs: 190389-194115 • HLT_L1SingleMuOpen and json_DSConly.txt • GMT Qualities selected: • Quality 5: RPC Only • Quality 6: DT or CSC, No RPC • Quality 7: DT/RPC or CSC/RPC

  4. GMT Eta Distribution Spikes Eta

  5. What causes the spikes? • Observe each subsystem independently • Observe GMT-DT matches at GMT Quality 6, 7 • Observe GMT-CSC matches at GMT Quality 6, 7 • If GMT Eta > 2.1, require CSCTF Mode 5 • Observe RPC-GMT matches at GMT Quality 5 and GMT BX = 0 • Plot each Eta distribution

  6. GMT-CSC Matches at Quality = 6 No spike observed at |Eta| = 1.0 Eta

  7. GMT-CSC Matches at Quality = 7 No spike observed at |Eta| = 1.0 Eta

  8. GMT-CSC Matches at 5 ≤ Quality ≤ 7 No spike observed at |Eta| = 1.0 Eta

  9. GMT-RPC Matches at Quality = 5 Eta

  10. GMT-DT Matches at Quality = 6 Spikes Eta

  11. GMT-DT Matches at Quality = 7 Eta

  12. GMT-DT Matches at 5 ≤ Quality ≤ 7 Spikes Eta

  13. Part 2 • GMT Relative Rates

  14. Relative GMT Matches • Plot number of GMT-subsystem matches relative to total number of GMT matches • Plotted for each category (below) • Define several categories for matches: • DT, |Eta| < 0.9 • CSC, 1.2 < |Eta| < 2.1 • or 1.2 < |Eta| < 2.0 (See next slides) • RPC, |Eta| < 1.6 • DT Overlap, 0.9 < |Eta| < 1.2 • CSC Overlap, 0.9 < |Eta| < 1.2

  15. Two Methods of Plotting • Plot GMT-subsystem matches divided by total number of GMT matches (referred to as “relative counts”) • Plot GMT-subsystem matches divided by total number of GMT matches per subsystem region width (a type of rate density) • Example: • CSC (1.2 < |Eta| < 2.1): each Eta bin has width of Eta = 0.1 • Therefore CSC relative counts divided by 18 bins

  16. Relative Counts, |Eta| < 2.1 60% of the GMT matches come from the CSCs.

  17. Relative Counts Per Region Width,|Eta| < 2.1 The spikes we saw in the Overlap region from the DT each come in a single bin (Eta = ±1.0) The DT overlap region produces a much greater contribution per bin.

  18. Relative Counts, |Eta| < 2.0 Now, with |Eta| strictly less than 2.0, the CSCs are seen to contribute less than 30% of the GMT tracks (outside the overlap region). A lot of rate is bottled up in that extra Eta bin at ±2.1 (some tracks maybe have ME1/1 A station).

  19. Relative Counts Per Region Width, |Eta| < 2.0 Once again, with the width of the full region reduced from |Eta| < 2.1 to |Eta|< 2.0, the CSCs are seen to contribute much less rate. The DT Overlap’s spikes are very apparent here.

  20. Conclusions • Spikes do not appear to come from CSC • But there is a lot of rate at 2.0 <|Eta| < 2.1 • Some tracks may come from ME 1/1A • DT in overlap region shows spikes • Appears to be Eta = ±1.0 • Plan to repeat study • Use HLT_L1SingleMu10 • More statistics • JSON_MuonPhys.txt • Exclude possible problems in muonsystem

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