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pp-pileup in MDC4

pp-pileup in MDC4. Goals MDC4 statistics vertex finder performance (ppLMV) leading particle recon efficiency. Jan Balewski, IUCF Star Analysis Meeting May 13, 2001 , BNL. MDC4 overview. Small problems of MDC4: crash after ~400 eve  fixed SVT crash on empty eve  fixed

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pp-pileup in MDC4

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  1. pp-pileup in MDC4 • Goals • MDC4 statistics • vertex finder performance (ppLMV) • leading particle recon efficiency Jan Balewski, IUCF Star Analysis Meeting May 13, 2001 , BNL

  2. MDC4 overview • Small problems of MDC4: • crash after ~400 eve  fixed • SVT crash on empty eve  fixed • root crash after 15,000 eve  fixed • root version RCF vs. PDSF  recompiled • NFS problem corrupted DST  rerun • 100,000 pp events processed • PYTHI 6.1, minbias, nondiffractive • GSTAR with y2001 (actual) geometry • 8 pileup events added • root4star --> ppDST • ‘spin sorted’ -distributions for rLP • ResourcesMDC4=1 hour of STAR • CPU : 50 sec/event •  total 1400 hours CPU •  1000 jobs with 100 events •  2 days on 100 CPU (real time) Thanks to Yuri, Lidia, Helen and all other for help

  3. MDC4: pp event topology 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 104 Total 105 events ( 1 hour of STAR) X minbias trigger 12 primary tracks, ~30 TPC tracks Leading Particle pT (GeV/c)

  4. MDC4: Vertex finder (ppLMV) -2 -2 0 0 2 2 Only TPC tracks used with 8 pileup’s /event (without pileup in green) RMS=6.7 cm generated =7.5 cm Z (cm) RMS=4.7 mm (3.2 mm) ‘efficiency’=96% (90%) signal/noise =5/2 (68/1) RMS=4.3 mm (3.2 mm) Vertex Z (cm) Vertex X (cm)

  5. MDC4: Efficiency of ppLMV vs. LP pT 0 0 1.5 1.5 -1.5 -1.5 Only TPC tracks used with 8 pileup’s /event Leading Particle pT <1 GeV/c RMS=5.1 mm signal/noise =5/2 pT =[2,3] GeV/c RMS=3.3 mm signal/noise =9/1 pT =[1,2] GeV/c RMS=3.9 mm signal/noise =6/1 Vertex Z (cm) Vertex Z (cm)

  6. MDC4: Reconstructed LP vs.  With 8 pileup’s per event (no SVT) No pileup (no SVT) GeV/c GeV/c problem GeV/c GeV/c  of recon LP (deg)  of recon LP (deg)

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