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PIXEL patch efficiency

PIXEL patch efficiency. Update of friday’s meeting. 2 configurations of pixel sectors (3 out of 10) are studied for reconstruction of low or high Pt D 0 ’s. we looked at the normalized distributions (Pt,  ) of the parent D 0 for different cuts on the Pt of their daughters. patch:

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PIXEL patch efficiency

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  1. PIXEL patch efficiency • Update of friday’s meeting. • 2 configurations of pixel sectors (3 out of 10) are studied for reconstruction of low or high Pt D0’s. we looked at the normalized distributions(Pt,) of the parent D0 for different cuts on the Pt of their daughters. patch: triangle patch: joined HFT patch acceptance

  2. Simulation • Generate 100k D0 with : • Flat Pt in [0,5], ||<3,|Vz|<10 cm • Use only fz file --> no reconstruction, etc … • Count : • NN : # of D0 input • N0 : # of D0 after Pt cut for both daughters and|| <1 • N1 : # of D0 with above cuts + TPC>10,PXL=2 • N2 : # of D0 in triangle configuration • N3 : # of D0 in joined configuration • Then : • Efficiency triangle config. = N2 / N1 • Efficiency joined config. = N3/ N1 • etc … HFT patch acceptance

  3. Summary of plots • Slide 4 : phase space of D0 generated with Starsim : NN • Slide 5-7 : application of cut |  |<1 and Pt of daughters : N0 • Slide 8-10 : application of cut |  |<1 , TPC>10, PIXL=2, and Pt of daughters : N1 • Slide 11-12 : application of cut |  |<1 , TPC>10, PIXL=2, and Pt of daughters and patch triangle : N2 • Slide 13-14 : application of cut |  |<1 , TPC>10, PIXL=2, and Pt of daughters and patch joined : N3 HFT patch acceptance

  4. Phase space : input (NN) • Pt and  of the D0’s with Starsim • Uniform distributions HFT patch acceptance

  5. Cut on daughters : ||<1 , Pt>0.3(N0) HFT patch acceptance

  6. Cut on daughters : ||<1 , Pt>0.8 (N0) HFT patch acceptance

  7. Cut on daughters : ||<1 •  distributions have the same shape. • the cut Pt>.8 removes entries around Pt ~ 1GeV HFT patch acceptance

  8. Cut on daughters : ||<1 , Pt>0.3, TPC>10,PIXL=2(N1) HFT patch acceptance

  9. Cut on daughters : ||<1 , Pt>0.8, TPC>10,PIXL=2(N1) HFT patch acceptance

  10. Cut on daughters:||<1,TPC>10,PIXL=2 •  and Pt distributions have similar shapes than in slide 7. • TPC and PIXEL hits cuts just gives a “usable” number of D0’s for this study (same cuts are applied in BFC reconstruction), it does not change the kinematics of the D0’s. HFT patch acceptance

  11. Cut :||<1, TPC>10,PIXL=2,patch=triangle(N2) Pt(daughters)>.3 Pt(daughters)>.8 HFT patch acceptance

  12. Cut on daughters :||<1, TPC>10,PIXL=2,patch=triangle • The cut at Pt>.8 removes more entries for Pt~1GeV/c. HFT patch acceptance

  13. Cut :||<1, TPC>10,PIXL=2,patch=joined(N3) Pt(daughters)>.3 Pt(daughters)>.8 HFT patch acceptance

  14. Cut :||<1, TPC>10,PIXL=2,patch=joined • The D0’s Pt distribution is not sensible to the cut on the daughters Pt with this PIXL configuration. HFT patch acceptance

  15. Next : • What is the best configuration ? optimization • Run BFC chain (reconstruction) over existing production with patches. • Do the simulation with run 13 : agml • Try to optimize the tracker because we do expect bad performances with TPC+PIXL (searchWindow parameters, to check with StiPulls) HFT patch acceptance

  16. Item 1. :Optimization wrt TPC sectors • TPC has 12 sectors • PIXEL has 10 sectors HFT patch acceptance

  17. Item 2. : reconstruction with BFC • Option 1 : • mask the pixel Hits in the FastSimMaker (ready) • Run the BFC with no reconstruction in SSD (then no tracking) and no tracking in IST • This will allow us to use the old fz already previous • Cons : • It will not be as the real situation since the material of SSD,IST will be taken into account • Option 2 : • Modify the geometry in GEANT to have the desired pixel geometry + no SSD, no IST (done in starsim) • Generate fz files • Run BFC • Cons : • Require a bit more work but precise material. HFT patch acceptance

  18. Option 1. Only pixelHits that satisfy the condition for this configuration (based on their ladder and layer number Option 2. Upgr15 modified HFT patch acceptance

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