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pp Pileup Filter in 2001

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  1. pp Pileup Filter in 2001 Jan Balewski, IUCF L3 Workshop May 9, 2001 , BNL

  2. How hard collision can be probed in 2001 ? 107 P•AN ~1% 103 • Assuming • L=4•1030cm-2s-1 • NON DIF =28 mb • DAQ rate of 30 Hz • 7•107 events over 4 weeks • Trigger mix: • unbias trigger (RHIC clock) • B-B counters minbias trigger • EMC high tower trigger ( p0 ) • CTB high PT trigger (ADC > ~n*MIP’s) • FPD trigger ( forward p0 ) (with some mutliplicity cut)

  3. p+p Pileup in 2001 L=4•1030cm-2s-1,NON DIF =28 mb Collision rate = 120 KHz 60 bunches/ring  213 nsec 1 coll/50 bunches = 1 coll/10 sec 40 sec TPC drift  8 coll/ TPC frame pileup  few 100 tracks in TPC diamond total width of ± 15 cm PYTHIA minbias trigger event, generated at s=200 GeV Leading Particle Track color encodes its transverse momentum (GeV/c) Y X 12 primary tracks, ~30 TPC tracks

  4. L3 topology (at some point in the past) GL3 SL3

  5. L3 pileup filter in 2001 GL3 dump • refit track segments • match tracks to CTB slats • find vertex • match tracks to vertex • tag tracks & L3 points SL3 Sector track finder Track segments TPC space points CTB Sector claster finder TPC raw TPC hits