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Enhanced Trigger Performance with Advanced Singlet Algorithm in L1 Central Tracking

This paper discusses the improvements in Level-1 Central Tracking (L1CTT2b) by employing a refined Singlet algorithm to enhance track definitions in high-energy physics experiments. Utilizing a combination of silicon and scintillating fiber detectors, we achieved efficient trigger performance with an overall suppression of fake triggers. Our findings showcase a 97.5% trigger efficiency in Run2b with significantly reduced QCD fake rates. The studies indicate promising results in extending the Singlet algorithm to lower momentum ranges, ensuring robust performance with low FPGA resource utilization.

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Enhanced Trigger Performance with Advanced Singlet Algorithm in L1 Central Tracking

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  1. DØ Track triggerLiang Han and Yu-Hsiang (Louis) Lin

  2. Vertex & Central Tracking 1. SMT: silicon ~ 10 mm 2. CFT: scintillating fiber ~ 100 mm

  3. Fibers of 1 super Layer/sector:

  4. Use look up tables of all possible combinations of ‘singlet’ or ‘doublet’ hits to define tracks in Level-1 trigger

  5. PT1 effi PT1 fake FPGA Run2a 96.9% 1.0% ~50% Run2b 97.5% 0.03% ~140% • Trigger efficiency -> high • QCD fake -> low • FPGA resource -> low Good overall performance! L1CTT2b Singlet vs. current Doublet： Low fake @2E32 >10KHz! Pass DOE Review -> upgrade baseline

  6. Latest development of L1CTT2b： Aiming to reduce fake further at low PT area, we extended Singlet algorithm to the whole PT>1.5 range. preliminary studies gave positive result • we believe after pruning FPGA of all Singlet can be under control, eg • good efficiencies, eg for the hardest cut hits>100 • Fake study in progress, see Louis’ talk

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