TPC-SVT Fourth Level Trigger

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Rene Bellwied, Wayne State University February 13, 1995

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4th Level Trigger Options

• Baryochemical Potential Trigger
  • Description: measures stopping and baryochemical potential via p/pbar ratio
  • Modules needed:
    • SVT tracking
    • TPC tracking
    • SVT-TPC matching
    • global refitting
    • global PID
  • Alternate Trigger: include TOF
• Strangeness Trigger
  • Description: measures strangeness density via K/pi ratio
  • Modules Needed: modules needed: SVT tracking
    • TPC tracking
    • SVT-TPC matching
    • global refitting
    • global PID
  • Alternate trigger: include TOF
• Strangeness Chemical Potential Trigger
  • Description: measures net zero strangenss via lambda/p or lambda/K ratio. Depends strongly on lambda enhancement in QGP case (present FRITIOF has only 6 lambdas per event in our accpetance).
  • Modules needed:
    • SVT tracking
    • TPC tracking
    • SVT-TPC matching
    • global refitting
    • global PID
    • SVT V0 reconstruction (most probably too slow)

Availability of Possible SVT Trigger Algorithms

• SVT-TPC Matching, hash tables
  • Contact person: Dave Read, Lanny Ray
• Global Tracking
  • contact person: Lanny Ray
• Global PID
  • contact person: Lanny Ray
• SVT V0 reconstruction
  • contact person: Ken Wilson