1 NCC Task Force Richard Seto NCC Task Force Meeting Dec 14, 2007 BNL

2 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 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. HI spin answer to committee

3 Schedule- work over the holidays Simulations chic – holidays – goal done by Dec 23 (Sky/Carla/Ondrej/Rich) Projective Geometry answer – done in a week (Edouard) 2 track pi0 – will be done in a week (Rich) single track pi0 – holidays – goal done by Jan 1 (Dave/Ondrej/Stefan) Direct photon signal in AuAu – Jan 5 A LL - Jan 7 Writing Assignments (write over the holidays) Intro – Rich (note prelim version of bullets done) Reconstruction – Edouard Calibration etc – Ondrej pi0 in heavy ions – Dave/Rich/Stefan direct photon in heavy ions – Takao Chic- Rich/Carla/Sky Spin – Ken/Todd Trigger – John Summary – Rich Timing To brant – Jan 14 To collaboration – Jan 20 To DOE – End of Jan Welcome to Statistical Mechanics Prof. Richard Seto grade 2 room 9 hwk due jan 8, 2007 gee – maybe I should have prepared for this class over Christmas…..

4 Latest 2 gamma spectra (near final) To be turned into R_AA Calibrations some not latest, some latest Cuts – for Heavy ion (i.e. all except 500 GeV pp) Chi2<10 opening angle >35-50 depending on run (standardize to 50) pt>200 For cut level 2 – no cut on y_gamma for cut level 3 – y_gamma<1.5 Note – 2 gamma’s close up at ~E=~4-5 GeV ~3 GeV Pt at y=1.5 and 1 GeV at 2.5

5 Example AuAu 80-92% y=1-1.5 pt=1.5-2 real pairs “hi pt” pi0 embedded in bkg mixed pairs pi0 embedded in bkg real pairs bkg only add in bkg from min bias events with no “high pt pi0” shows S/B Fit to subtracted spectrum subtracted spectrum Fluctuations to be added in later m=.133 sigma=.022 will typically show only these two

6 2 gamma pp 200/500 (spin) y=1-1.5 pt=1.5-2 y= pt= ppmb y=1.5-2 pt= y=1-1.5 pt=1.5-2 pp mb 500 GeV

7 heavy ions y1-1.5 pt1-1.5 y1-1.5 pt AuAu 50-60% y=1-1.5 pt=1.5-2 y=1.5-2 pt= dAu central opening angle cut must be increased

8 S/B pp dAu cent AuAu 50-60% ~0.6 ~0.02 ~0.2 central Arms pp GeV ~1.5 central Arms AuAu 0-10% ~0.005

9 AuAu b=11 (50-60%) :::::::::::::: spectrum_infoY _cut3.txt :::::::::::::: etamin-max ptmin-max m(pi) sig(pi) signal signal+back error frac_error nsigma signal/back eff e e e e e e e e e e e e e e e e :::::::::::::: spectrum_infoY _cut2.txt :::::::::::::: etamin-max ptmin-max m(pi) sig(pi) signal signal+back error frac_error nsigma signal/back eff e e e e ::::::::::::::

10 R_AA stat error only – 2 gamma y=1-1.5 single track takes over Assumed AuAu – 10B min bias events (since is 10% of cross section) scale error bars by 3 for 1B

11 Going to higher centrality Need more cuts chisqL<2 chisqT<4 Need to use DST probably – since VERY CPU intensive – running now at ISU longitudinal chi2 transverse chi2

12 AuAu b % pt=1.5-2 pt= pt= eff tot m=.123 sig=.030 m=.165 sig=.035 m=.175

13 AuAu b % pt=1.5-2 pt= m=.113 sig=.038 m=.133 sig=.035 eff tot 0-10% running at ISU now

14 status pp dAu mb dAu cent AuAu b % AuAu b % AuAu b % AuAu b % AuAu b % ½ AuAu b % AuAu b % ½ AuAu b % AuAu b % - running at ISU easy chi2 cut tight chi2 cut – run higher statistics when code is sped up

15 My plans My plan is to wrap the two track pi0 up in the next week, and spend the holiday A) writing B) helping with the chic. I hope to return from the holiday with the beginnings of a draft I will also make assignments for parts of this writeup that can be written before we have the final plots in the next week.