1 / 29

NCC Task Force

NCC Task Force. Richard Seto NCC Task Force Meeting Dec 4, 2007 BNL. Agenda. Reports Its Dec 4–asses whether Dec 20 is a reasonable goal for completion. Report from Dave/Stefan – pi0, dir photon Carla/Sky - chic Ken – delta G

eitan
Télécharger la présentation

NCC Task Force

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. NCC Task Force Richard Seto NCC Task Force Meeting Dec 4, 2007 BNL

  2. Agenda • Reports • Its Dec 4–asses whether Dec 20 is a reasonable goal for completion. Report from • Dave/Stefan – pi0, dir photon • Carla/Sky - chic • Ken – delta G • Edouard/Ondrej – general state of reconstruction/calibrations • The question is can we start the following: • Some folks will start to write: • Goal? Doc to collaboration, mid -Jan • Doc to DOE – end of Jan, before QM • I will have to give an update for the Wed core week meeting so please provide me with plots by next Tues meeting

  3. Goals • Started with ncc bullets • The goals in simplest terms for the NCC task force is to produce the following figure of merit (FOM) plots from realistic physics simulations. Realistic means a full simulation using PISA with detector response, reconstruction, and data analysis. • a) R_AA for pi0 as a function of pt for various centralities in AuAu and dAu collisions • b) Direct photons cross sections, and likewise R_AA. • c) R_AA for the Chi_C via its decay to J/psi photon as a function of pt for various centralities. Very likely we will limit this to rapidity 1-1.5 • d) A_LL(pt) for direct photons in 500 GeV polarized pp collisions • d') Because we already have jet reconstruction going in pp collisions we should easily be able to use this information to get A_LL(x) giving a greater sensitivity to low-x • e) a demonstration that we can we can extract pi0's at various angles in various centrality collisions with a known efficiency - This should answer the projective Geometry question.

  4. ngammas, from edouards new code, a new chi2 from Ondrej richard seto Dec 4

  5. Ngammas black – mc ngammas red=ngammas where I cut chi2<10 black- from MC red – from NCC edouards new code black – mc ngammas red=ntracks cut E>1000 MeV cut E>300 MeV

  6. Ngammas +Ondrej new chi2 black – mc ngammas red=ngammas where I cut chi2<10 black- from MC red – from NCC edouards new code ondrej’s new code conclusion chi2<10 good Low energy need recalibration black – mc ngammas red=ntracks cut E>1000 MeV cut E>300 MeV

  7. chi2=Lchi2+Tchi2 I think Y=1.5-2.0 Y=1.0-1.5 from this I think maybe I should cut at ln(chi2)=4 or chi2=50 instead of 10? ln(chi2) ln(chi2) black – all tracks from pp min bias file colored lines are from pi0 only files red photons from pt_pi0=1-1.5 blue photons from pt_pi0=5-5.5 magenta photons from pi0=9-9.5 except y=2-2.5 where its 7.5-8 Y=2.0-2.5 ln(chi2)

  8. chi2=Lchi2+Tchi2 I think Y=1.5-2.0 Y=1.0-1.5 Ondrej – new chi2 from this I think maybe I should cut at ln(chi2)=4 or chi2=50 instead of 10? ANSWER:NO now chi2 kill bkg more effectively ln(chi2) ln(chi2) black – all tracks from pp min bias file colored lines are from pi0 only files red photons from pt_pi0=1-1.5 blue photons from pt_pi0=5-5.5 magenta photons from pi0=9-9.5 except y=2-2.5 where its 7.5-8 Y=2.0-2.5 ln(chi2)

  9. Lchi2 Y=1.5-2.0 Y=1.0-1.5 ln(chi2) ln(chi2) black – all tracks from pp min bias file colored lines are from pi0 only files red photons from pt_pi0=1-1.5 blue photons from pt_pi0=5-5.5 magenta photons from pi0=9-9.5 except y=2-2.5 where its 7.5-8 Y=2.0-2.5 ln(chi2)

  10. Lchi2 Y=1.5-2.0 Y=1.0-1.5 Ondrej – new chi2 kills bkg more effectively ln(chi2) ln(chi2) black – all tracks from pp min bias file colored lines are from pi0 only files red photons from pt_pi0=1-1.5 blue photons from pt_pi0=5-5.5 magenta photons from pi0=9-9.5 except y=2-2.5 where its 7.5-8 Y=2.0-2.5 ln(chi2)

  11. Tchi2 Y=1.5-2.0 Y=1.0-1.5 ln(chi2) ln(chi2) black – all tracks from pp min bias file colored lines are from pi0 only files red photons from pt_pi0=1-1.5 blue photons from pt_pi0=5-5.5 magenta photons from pi0=9-9.5 except y=2-2.5 where its 7.5-8 Y=2.0-2.5 ln(chi2)

  12. Tchi2 Y=1.5-2.0 Y=1.0-1.5 Ondrej – new chi2 Start thinking about cutting separately on Lchi2 and Tchi2 ln(chi2) ln(chi2) black – all tracks from pp min bias file colored lines are from pi0 only files red photons from pt_pi0=1-1.5 blue photons from pt_pi0=5-5.5 magenta photons from pi0=9-9.5 except y=2-2.5 where its 7.5-8 Y=2.0-2.5 ln(chi2)

  13. 2 gamma pi0After Edouards new code Dec 2BEFORE Ondrej chi2 Cuts: 0 – chisq<10 1 – eta<1.5 chisq<10 2- pt>200 chisq<10 3- eta<1.5 pt>200 chisq<10 good only for y=1-1.25

  14. ppmb y=1-1.5 embedded events subtracted fit signal on full bkg pt=1-1.5 cut3 pt=3-3.5 cut3 pt==2-2.5 cut3 black signal embedded in bkg red – mixed events blue – bkg from events with no embedded pi0 cut is so effective we need to run much more bkg

  15. ppmb higher y embedded events subtracted fit signal on full bkg y=1.5-2 pt=1-1.5 cut2 y=2-2.5 pt=1-1.5 cut2 y=1.5-2 pt=2-2.5 cut2 black signal embedded in bkg red – mixed events blue – bkg from events with no embedded pi0 as high in pt as we can go for 2 gamma at y=1.5-2 as high in pt as we can go for 2 gamma at y=2-2.5

  16. ppmb :inv yield with error bars, pi0 mean/width S/B S/B pi0 width pi0 mass pi0 width pi0 mass y=1-1.5 y=2-2.5 y=1-1.5 Central arm pp pT/GeV S/B ----------- 1 1.5 2 7

  17. ppmb eff all pt bins correct pt bin higher pt bin lower pt bin y=2.0-2.5 y=1-1.5 y=1.5-2.0

  18. dAu mb y=1-1.5 embedded events subtracted fit signal on full bkg pt=1-1.5 cut3 pt=3-3.5 cut3 pt==2-2.5 cut3 black signal embedded in bkg red – mixed events blue – bkg from events with no embedded pi0

  19. dAu mb higher y subtracted subtracted embedded events embedded events signal on full bkg fit signal on full bkg fit y=1.5-2 pt=1-1.5 cut2 y=1.4-2 pt=1.5-3 cut2 black signal embedded in bkg red – mixed events blue – bkg from events with no embedded pi0

  20. dAu mb y=1-1.5 eff all pt bins S/B eff correct pt bin pi0 width pi0 mass efff higher pt bin eff lower pt bin

  21. dAu mb y=1.5-2 eff all pt bins S/B eff correct pt bin pi0 width pi0 mass efff higher pt bin eff lower pt bin

  22. dAu cent y=1.0-1.5 subtracted subtracted embedded events embedded events signal on full bkg fit signal on full bkg fit pt=3.5-4 pt=1-1.5

  23. dAu cent higher y subtracted embedded events signal on full bkg fit y=1.5-2 pt=1-1.5

  24. dAu cent y=1.0-1.5 eff all pt bins S/B eff correct pt bin pi0 width pi0 mass efff higher pt bin eff lower pt bin y=1-1.5

  25. dAu cent 1.5-2.0 all pt bins S/B correct pt bin pi0 width pi0 mass higher pt bin lower pt bin y=1-1.5

  26. AuAu ~50% subtracted subtracted embedded events embedded events signal on full bkg signal on full bkg fit fit

  27. AuAu 50% higher y subtracted embedded events signal on full bkg fit y=1-1.5 pt=1-1.5

  28. AuAu 50% y=1-1.5 all pt bins S/B correct pt bin pi0 width pi0 mass higher pt bin lower pt bin y=1-1.5

  29. plans • 2 track pi0’s - limited pt range • Central ran at ISU last nite – low bkg statistics (need to make plots) • use bigger stats for pp bkg • get 500 GeV S/B etc • run everything with final cuts • Get final R_AA plots out • Big step – merge with single track data

More Related