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Progress

Progress. High pt D=>Kpi, need rates S/B vs DCA cut and S/  B vs DCA cut strategy reminder B=0 Fit Si hits with a line, calculate DCA to collision use fast filter to see if p , K in PHENIX acceptance Progress pythia 100k p+p => D + x 5.5k D with pt > 2GeV/c

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Progress

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  1. Progress High pt D=>Kpi, need • rates • S/B vs DCA cut and S/B vs DCA cut strategy reminder • B=0 • Fit Si hits with a line, calculate DCA to collision • use fast filter to see if p, K in PHENIX acceptance Progress • pythia 100k p+p => D + x • 5.5k D with pt > 2GeV/c • decayed, filter (tof || aerogel for K) && (dch for pi) • no pairs both in acceptance?, bug, or opening angle Craig Ogilvie

  2. backups Craig Ogilvie

  3. Work Plan (done =) • <ncoll> * D from pythia, p, K from min.bias Au+Au EXODUS • pt > 1 GeV/c on p, K (primary and daughters) • selects > 2 GeV/c D’s • Kaon into acceptance of TOF or aerogel • goal of PID cut is to reduce S/B • S/B vs DCA cut • Use Tony’s #events collected in a Au+Au run • significance of signal over fluctuating background • increases with sqrt(nevents) • plot significance vs DCA cut Craig Ogilvie

  4. aerogel Craig Ogilvie

  5. Bz Bz values in field map vary < 1% (histogram of points in map) -12<z<12 and 4 < r < 10 cm Craig Ogilvie

  6. Fitting A review of fast circle and helix fitting R. Fruhwirth http://acat02.sinp.msu.ru/presentations/fruehwirth/talk.pdf Craig Ogilvie

  7. D+ => K-p+ p+(BR 9%) Lc High-pt: Flavor Dependence Energy-loss • @ higher pt, e and m decay channels dominated by beauty • hadronic decay for high-pt charm spectra • multiple-scattering, small acceptance less problematic pt >4 GeV/c D0=>Kp p+p 30k/year Au+Au 10K/year Au+Au 4blue-book luminosity, 50 full days/year, yield Au+Au= AA*(yield p+p) Craig Ogilvie

  8. PHENIX QM02 Craig Ogilvie

  9. Electron pt Spectra from D Craig Ogilvie

  10. Signal/background of invariant mass peak (2002 plots) Kapton beam-pipe Be beam-pipe S/B ~ 0.1% for dca cut =150mm Assumed per event 1 D0, 150 K-, 1000 p+ Craig Ogilvie

  11. DCA of K/Pion from D0 comparing with DCA of primary K/Pion (no pt cut)

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