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Aug 2003 Craig Ogilvie 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,

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Presentation on theme: "Aug 2003 Craig Ogilvie 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,"— Presentation transcript:

1 Aug 2003 Craig Ogilvie 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 , 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

2 Aug 2003 Craig Ogilvie 2 backups

3 Aug 2003 Craig Ogilvie 3 Work Plan (done =  ) * D from pythia, , K from min.bias Au+Au EXODUS pt > 1 GeV/c on , 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

4 Aug 2003 Craig Ogilvie 4 aerogel

5 Aug 2003 Craig Ogilvie 5 Bz Bz values in field map vary < 1% (histogram of points in map) -12<z<12 and 4 < r < 10 cm

6 Aug 2003 Craig Ogilvie 6 Fitting A review of fast circle and helix fitting R. Fruhwirth http://acat02.sinp.msu.ru/presentations/fruehwirth/talk.pdf

7 Aug 2003 Craig Ogilvie 7 High-pt: Flavor Dependence Energy-loss  @ higher pt, e and  decay channels dominated by beauty –hadronic decay for high-pt charm spectra »multiple-scattering, small acceptance less problematic D + => K -      (BR 9%) cc pt >4 GeV/c D 0 =>K  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)

8 Aug 2003 Craig Ogilvie 8 PHENIX QM02

9 Aug 2003 Craig Ogilvie 9 Electron pt Spectra from D

10 Aug 2003 Craig Ogilvie 10 Signal/background of invariant mass peak (2002 plots) Kapton beam-pipe Be beam-pipe S/B ~ 0.1% for dca cut =150  m Assumed per event 1 D 0, 150 K -, 1000  +

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

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