1 / 9

SVT 4/5 operation CDF meeting 1/16/2003

SVT 4/5 operation CDF meeting 1/16/2003. G. Punzi for the SVT group. SVT had a test run after Christmas with 4/5 operation and standard physics table (155818+) Uses all 5 SVXII layers allowing 1 miss Standard mode (4/4): require 4 hits on a fixed set of 4 layers

jerry-nunez
Download Presentation

SVT 4/5 operation CDF meeting 1/16/2003

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. SVT 4/5 operationCDF meeting 1/16/2003 G. Punzi for the SVT group

  2. SVT had a test run after Christmas with 4/5 operation and standard physics table (155818+) • Uses all 5 SVXII layers allowing 1 miss • Standard mode (4/4): require 4 hits on a fixed set of 4 layers • Separate test of 3/3 (recover 3-layer wedges) (155918) • Expect efficiency improvement and less need for SVT config changes with changing SVX conditions. • 4/5 mode is part of the SVT design, yet took lots of hard software work to implement: patterns, simulation, download code…(Roberto, Bill, Jahred...)

  3. Impact on trigger timing • SVT execution time increase 7µs • due to increased number of candidate track fits (compatible with expectations) • limited impact on overall L2: ~40µs  ~47µs (+17%) • No significant effect with the current L1 rate limitation • but we are looking at ways to control this anyway • Optimize patterns • Cut on strip noise

  4. Impact on trigger rates

  5. Resolution • Resolution uniform between combinations - slightly worse when L0 is missing • 3-layers: larger I.P. tails: 28% vs 17% (small number of wedges) (µm)

  6. Efficiency • Expect track efficiency improvement ~1.4 for the 2/3 of wedges with 5 active layers ~1.25 overall • Measurements of track eff. and S/B underway Eff. Gain (for tracks with 4 good hits) (/a4)[[1-(1-a5)5]+5(1-)a5] Patt. Coverage (4-comb.)

  7. D0 yield x1.7±0.1 (L3 tracks) (Roberto) 4/4 379 nb-1 4/5 471 nb-1

  8. D0 yield x1.46±0.01 (full reco)(Stefano) = 1.55

  9. Plans • Analyze “SVT calibration” run taken last week (being produced) • Study&optimize: 4/5 has even more free parameters than 4/4 - try to get maximum benefit with minimal side effects. • Further L3 rate reduction by Si tracking will be important (Marco,Rolf : ~x2 reduction) • Look forward to starting up with a new improved hadronic trigger after the shutdown

More Related