1 / 31

Report from the Muon Trigger WG

Report from the Muon Trigger WG. Aleandro Nisati On behalf of the Muon Trigger Slice Community Muon Week, April 18° 2007. Level-1. LVL1 Barrel: Efficiency curves for low-p T thresholds. Standard low-p T thresholds (6, 8, 10 GeV/c). log scale. p T [GeV]. p T [GeV]. p T [GeV].

cahil
Download Presentation

Report from the Muon Trigger WG

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Report from the Muon Trigger WG Aleandro Nisati On behalf of the Muon Trigger Slice Community Muon Week, April 18° 2007

  2. Level-1

  3. LVL1 Barrel: Efficiency curves for low-pT thresholds Standard low-pT thresholds(6, 8, 10 GeV/c) log scale pT [GeV] pT [GeV] pT [GeV] • CSC single muons data (Athena release12.0.3) • LvL1 performances have been studied using CommonMuonSlice AANT produced with rel 12.0.6

  4. LVL1 barrel : Low-pT Trigger rates Using the Level-1 Efficiency curves we may estimate the rates with different threshold.

  5. LVL1 Barrel: Efficiency curves for high-pT thresholds Standard high-pT thresholds(11, 20, 40 GeV/c) log scale pT [GeV] pT [GeV] • CSC single muons data (Athena release12.0.3) • LvL1 performances have been studied using CommonMuonSlice AANT produced with rel 12.0.6 • High-pT plateau at 78%

  6. LVL1 barrel : High-pT Trigger rates Level-1 Efficiency Preliminary Inclusive μcross-section @ LHC (prompt μ and /K decay)

  7. LVL1 barrel : Trigger rates vs. Threshold The plot shows the expected single muon trigger rates at a luminosity of 1033 cm-2s-1. The cosmic configuration is plotted with a threshold of 3 GeV. Rate [Hz] threshold [GeV]

  8. Endcaps : Software Status Latest TGC(endcap) LVL1 trigger software(towards 13.0.0) TrigT1TGC-00-01-26 - The algorithm creating CBNTAA is added. - Some minor bugs are fixed. TGCcabling-00-00-34 - Bug fixed Effect of these bugs are negligible. Future plan (once CBNTAA data is available) - perform rate calculation with the latest trigger configuration - optimize coincidence window and investigate position dependency - more detailed study of LVL1 di-muon trigger.

  9. Endcap Trigger Efficiency We used these data set. - Single muon events produced with athena 12.0.3(RDO) - Use TrigT1TGC-00-01-18-10 for LVL1 trigger simulation 6GeV 20GeV 3-station coincidence trigger efficiency of TGC

  10. Endcap Trigger Rates L=1033 cm-2 s-1 L=1034 cm-2 s-1

  11. MuCTPI overlap resolution in the endcap • We discovered that the sector numbering in the TGC and MuCTPI simulations were not consistent • This led to an increased fake double-count rate, since some sector edges were not handled by either simulation. • Compensating for it in the MuCTPI simulation, this is how the EC double-count probabilities change. • This results in a 315 Hz  37 Hz fake double count rate reduction in the endcap. (Preliminary result) • The total fake di muon rate goes from 432 Hz to ~154 Hz without MuCTPI with MuCTPI after the fix

  12. MuCTPI overlap resolution in the endcap (*) Not using strip masks on sector edges. This may improve the rejection of double counting.

  13. LVL2 Algorithms

  14.  muFast: improvements since last TP week • mFast resolution improved by the use of LUT for separate charge; • 6 GeV resolution moves from 10% to 7%; • degradation of the resolution at high-pT due to the vertex spread recovered by the use of the MDT fit segment from the Innermost Station; • comparison between mFast resolution obtained making use of different reconstructed variables (alpha and beta angles) shows a similar behaviour but: • alpha has more coverage than beta; • alpha shows less tails in the resolution distributions • Studies on which variables is best to use is still going on; • Studies to improve the timing of the calibration access are ongoing too. DR

  15.  muFast: improvements since last TP Week • mFast resolution improved by the use of LUT for separate charge; • 6 GeV resolution moves from 10% to 7%; • degradation of the resolution at high-pT due to the vertex spread recovered by the use of the MDT fit segment from the Innermost Station; • comparison between mFast resolution • obtained making use of different • reconstructed variables • (alpha and beta angles) shows a similar • behaviour but: • alpha has more coverage than beta; • alpha shows less tails in the resolution • distributions • Studies on which variables is best • to use is still going on; • Studies to improve the timing of the • calibration access are ongoing too.

  16. muFast: Using charge dependent LUT We use a Look-Up Table to calculate pT from the angle α. By taking into account the charge difference in the LUT, we see an improvement in the overall resolution ~10%  ~7 %

  17. muFast:Momentum measurement Sigma of Resolution distributions Momentum measurement using alpha, beta, radius and DeltaR Performances obtained using sample with no spread in Z for primary vertex. (Slight difference in dataset wrt previous measurement) As expected momentum measurement from radius and deltaR are linear wrt momentum on large momentum range. Mean of Resolution distributions

  18. Accessing the MDT calibration constants at LVL2 Problem: Using MDT calibration a` la offline takes ~40%~50% of total muFast time First: Understand the best granularity to access the MDT calibration constants (per tube, per layer, per station,...) Looking at Sector13 cosmics data (Nov 2006) accessing t0 and r-t relation per MultiLayer should be good enough (at least for LVL2 trigger purposes ) T0 distribution ~4ns BIL3 BIL2 BIL1 From M. Iodice Muon week talk Drift length ~ 7ns

  19. LVL2 mIsol Status • Algorithm: • Included in 13 nightlies • Migration to new steering: done • Configurables migration: on going (ready in 1 week) • Monitoring: • new monitoring module added: AANT + Histograms • so far used for CSC studies, eventually will provide monitoring histograms for DQ • Performances/Optimization studies: • Just started: • timing  cones/cell energy threshold optimization • To follow: • efficiency for Z/W, rejection against bbX BG

  20. Event Filter

  21. Seeding Algorithms assume the seed is from LVL2 or a LVL1 ROI Full functionality in barrel and end-caps 3 istances of TrigMoore called by the steering, for reconstruction in the MS, extrapolation to the IP and combination with ID tracks TrigMoore attaches to the TE a "TrigMooreFeature" for each ROI, accessed by TrigMooreHypo for pT test TrigMoore records in SG the TrigMooreFeature per each ROI and all reconstructed tracks in the event in a single container for conversion in Trk:Track format and subsequent output in ESD and AOD LVL1 LVL2 (muFast) LVL2 ID LVL2 (muComb) Seeding Algs Moore Algs Hypo Alg TrigMoore MuIdStandAlone Algs Hypo Alg MuIdCombined Algs Hypo Alg Offline ID TrigMoore : Brief Reminder (12.0.6) • Two different running modes: • Seeded • Reconstruction performed only in the geometrical regions provided by the RoIs of previous levels. • Full scan • Full reconstruction, ~equivalent to the offline working mode

  22. Work Ongoing for Rel 13 • TrigMoore and TrigMooreHypo have been migrated to the new trigger steering • first validation OK; more robustness test will follow • Use of the configurables • EDM Migration (see next slides) • Use of HLT seeded New Tracking ID for combined muons in TrigMuidCombined (see next slides) • Ongoing work to increase modularity: • present implementation not very flexible • we’ll have 3 HLTalgos instead of 3 instances of TrigMoore

  23. EDM Migration • Need to adapt Moore to be able to easily use new pattern recognition algs • Cosmic pattern recognition • Local CSC and MDT tracking • to be able to easily output objects required for Calibration/Alignment studies • use of PRD as common input • Motivated by Common Tracking for ATLAS and by desire for increased commonality in Muon-specific reco software • The current (12.0.6) implementation of TrigMoore uses digits (RDO) as input objects. Standard muon-sw converters or the production of digits from (transient) byte-stream or from RDO are used. Need to use Muon PrepRawData as input. (Trig)Moore PhiPatternsAlgTool Phi Patterns Combine Patterns Calibrated Segments Combined Segments Roads RZ Patterns RZPatternsAlgTool

  24. Trigger rates First exercise to look at rates at pT thresholds different than the typical scenarios: 6 and 20 GeV/c Luminosity set to 1033 cm-2s-1 efficiencies for LVL1 from F. Conventi for 6, 8, 10 GeV/c (in good agreement with our estimates) our estimates for 11, 20, 40 GeV/c Typical scenarios: mu(6) 3.0 kHz mu(20) 25 Hz

  25. Trigger rates First exercise to look at rates at the EF in the END CAPS and vs pT thresholds Luminosity set to 1033 cm-2s-1 Efficiencies for LVL1 from our estimate maybe slightly inaccurate for the known bugs in TGCCabling expected effects at EF <10% Typical scenarios: mu(6) 3.1 kHz mu(20) 27 Hz Barrel + EndCap EF Rate @ 1033 cm-2s-1mu(6) 6.1 kHz mu(20) 52 Hz

  26. Trigger Rates Rate for mu(5) at the EF in the barrel use LVL1 efficiency for the barrel with the trigger re-configured to have 5GeV/c as lowest threshold Luminosity set to 1033 cm-2s-1

  27. Muon Slice Data Quality (II) • Nothing exists for the moment for Muon Slice DQA but what implemented for monitoring during 2004 test beam (A. Di Mattia for LVL2) and the test of the trigger slices on the pre-series machines at Point 1 in december 2006 (D. Scannicchio for EF) can be a starting point for Data Quality Monitoring e.g. MuFast histos from last technical run Trigger/TrigAlgorithms/TrigmuFast/src/OnlineSurvey.cxx Shows linear distribution between 1/s and pT as expected Core of the fit residual matching the resolution of the single tube: 80 mm.

  28. Muon Slice Data Quality (III) e.g. TrigMoore histos for the ongoing technical run Trigger/TrigAlgorithms/TrigMoore/src/TrigMooreHisto.cxx (here obtained running the jobOptions prepared for the on-line with a bytestream file containing 50 top events as input: muons are selected by the LVL2 and the EF muon algorithms)

More Related