NCC simulation update DC meeting Oct 3, 2007 BNL Summary Schedule date for NCC Cost-schedule review ~mid Jan- date not finalized we must have our document to DOE by end of Nov We must have our document to the collaboration for review by ~mid-Nov A new CVS area set up: offline/analysis/NCCDOCS/NCCsimudoe The committee (the same previous committee) must pass us on the physics review before the Cost and Schedule review but the scheduling of that review is being done now The cost and schedule committee will be a new committee Status angular dependence, pi0, chic things work from PISA to reconstruction etc in pp working on higher multiplicities Successful test beam run able to read out detector using full electronics chain Axel asked for a full simulation status so some items are repeated from last time Tasks Each detector group should demonstrate and document scientific feasibility for two or more topics of high importance Pi0s (figure of merit R_AA vs centrality) Chic_C (figure of merit R_AA vs centrality [question of S/B] Simulation from generation, embedding, pisa, reconstruction and pattern recognition, analysis, signal extraction (figure of merit) The NCC group should demonstrate by simulations that the non- projective geometry and shower digitization does not preclude the ability to eliminate background at the level necessary to accomplish the proposed physics goals. eff of reconstrucing photons/pi0 vs angle do this vs multiplicity put in digitization Note: other things will come out but these are icing on the cake jet reconstruction direct photons NCC detector simulation Geant implemented into pisa Design change move SM detector from gap 9 to gap 3 (note it went gap 7,9,3) Merge working Major work now energy calibration show all ncc, and brick Change of geometry moved SM Tungsten 4 mm (EM) & 12mm (HAD) 500 um pitch Strips (StriPixels) EM1 electromagnetic EM2 electromagnetic HAD hadron identifier SM shower max PS pre-shower Depth: 42X 0 (1.6 ABS ) Silicon pads 1.5x1.5 cm 2 Analysis status Extensive shower shape study done to parameterize the showers (decided on 1/r as a rough 1 st step.) Detector energy calibrations had to be done (and now redone with correct pisa.par file) This turns out to be important and angle dependent (see later slides) Optimization of the pi0 code is being done (at the moment there are many different ways to calculate the mass) Cuts need to be figured out to optimize the chic NCC shower cuts FVTX cuts on DCA Simulation running AuAu basically done pp for spin studies about done 170 more jobs at ~5/day=28 more days Pattern recognition and reconstruction Detector gives towers (1x1 pad) in EM1 EM2 HAD take highest energy tower as a seed and form clusters Start in EM2, take highest energy cluster draw line to vertex match clusters from EM1 EM2 and HAD to form a track Iterate until all clusters used clusters can be shared between tracks this is where1/r parameterization is used Energy is calculated from ADC sum+angle (sampling fraction) Note Pi0 study may be done at the GEANT level and not at the PISA level Need to add magnet yoke and FVTX material in front 10 GeV e- y=1.1 y=1.5 y=2.5 EM1 HAD Angle studies 10 GeV electron y=1 center of gravity of cluster Like pixel tracking three layers+vertex iteration assuming parameterization of shower shape for cluster sharing etc vertex EM1EM2 HAD photon track eff vs y for 5 GeV Showers Delta E cut required 1 sigma (so max ~94%) need to do vs multiplicity delta E/E for GeV sigma~23% mean=0.13 Photons 14 E measured / E initial Problem seems to be in calibration in general Energy correction is rapidity dependent Edouard is working on this ChiC first energy resolution for NCC then J/psi from FVTX then Chic some numbers before after quick and dirty energy correction (needs to be done MUCH more carefully function of angle etc) Ondrej is doing this Edouard found some problems in code Width of chic ~100 MeV with Energy recal from TDR Rich analysis, now on to pp pythia events cheat use know photon for chic Procedure use known photon (closest one) Cuts Chisq_ncc0.5GeV chic_real background all events harder cuts Cuts chisq_ncc1 pt_photon>0. 5 Sky analysis -Now for real Mixed and Real Events chic embedded in pp min bias Require J/psi and gamma to be in same NCC using rapidity cuts. Apply cuts suggested by Rich, Ephoton>0.5GeV, and chisq_photon 3.8. Working further on energy calibs not certain that my analysis had same energy recal Edouard a problem in his code ( c - J/) Mixed Mass dAu Minbias Plots show Pt slices from 0- 5GeV In 1.25GeV increments. Data sample 50K dAu minbias ( c - J/) Background Subtracted Plots show Pt slices from 0- 5GeV In 1.25GeV increments. Data sample 50K dAu minbias Counting question Should get 10K chic in central events in 1 yr run Real question is what is will S/B be? Things that help dN/dy of pi0 ~1/2 J/psi width reduced by FVTX by 1.5 rejection of hadronic decay-DCA cut (needs to be studied) J/psi width ~100 MeV with fvtx stuff from melynda need to work on additional clean up cuts What is it? The parts of the NCC Silicon pads 1.5x1.5 cm 2 Tungsten 4 mm (EM) & 12mm (HAD) HAD hadron identifier SM shower max PS pre-shower Depth: 42X 0 (1.6 ABS ) 30 GeV 0 The PS and SM Detectors: identifying 0 s 500 um pitch Strips (StriPixels) SM Total Energy from pads Opening angle from PS Energy asymmetry from SM invariant mass old slide of illustration single 0 simulations PS Total Energy from pads Opening angle from PS Energy asymmetry from SM invariant mass SM old slide of illustration 2-track single-track new simulation old slide of illustration merged into pp two track, 5-10Gev two track, 10-15Gev single track, 10-15Gev Signal pi0s with pt spectrum put in by hand background pythia with real pi0s concentrated at low energy pp merged single track pi0s GeV GeV GeV GeV 0 now merged in 10 min bias pythia events On to higher multiplicites (from edourd) EK 09/25/2007 Track momenta P [GeV/c} PT [GeV/c} 0s vs 0s with 10 MB events single track pi0s Test particle merged with 10 min bias events just pi0, black total colors are momentum bins red is lowest (ask edouard what the bins are get the pt range) cable fixed 100 GeV e width 5% Theory Getting pi0 suppression Theory plots form V Topor Pop (Hijing) Will be contacting Ivan Vitev Also running hijing changing MFP and energy loss Some predictions from Vasile Pop Central 10% y=0 SCF (strong color fluctuati ons) ncc rapidity Less suppression predicted by SCF model in forward than central rapidity