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Year -2

Year -2. topics simulations needs for these. Barbara Jacak March 2, 2001. Year -2 physics topics. This year’s analyses at s = 200 multiplicity, E T , flow single particle spectra, ratios HBT higher p T electron pairs and K+K- muons and e- m direct g spin.

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Year -2

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  1. Year -2 • topics • simulations needs for these Barbara Jacak March 2, 2001

  2. Year -2 physics topics • This year’s analyses at s = 200 • multiplicity, ET, flow • single particle spectra, ratios • HBT • higher pT • electron pairs and K+K- • muons and e-m • direct g • spin

  3. For analyses like this year • HIJING events for Nch, ET, p0 corrections • ~100K events adequate, as this year • single particles for correction functions & embedding • as this year, but higher statistics • few days - a week CPUs usage

  4. Charged singles corrections • Throw single particles • flat in pT, weight for correct spectrum • physics processes in PISA yield decay, interaction corrections • Tracking as in data • get geom. Acceptance & tracking efficiency • rely upon DC,PC simul/data agreement • correct for match, TOF cuts via cut s • TOF simulation being worked on now - will allow same cuts on MC & data • Make corrections vs. pT • fit to remove statistical fluctuations • Separate Nch dependence • by embedding tracks into real events • check that pT and Nch effects factorize

  5. completeEvaluation ntuple Event Vertex:eventxvtx, eventyvtx, eventzvtx Pc Vertex: Reconstructed: pc13vtxr GEANT: pc13vtxm Bbc Vertex and t0: bbcvtx, bbct0 Dc charged particle track: Reconstructed: recoQual, momentumR, theta0R, phi0R, xhits, uvhits ,chi2, numHitsFit Evaluation: sumfound, solution, . . . GEANT: momentumG, theta, phi, theta0G, phi0G, alphaG, betaG, zedG Pc1 and Pc3 hits: Reconstructed: xpc1r,ypc1r,zpc1r,xpc3r,ypc3r,zpc3r Projected: xpc1pro, ypc1pro, zpc1pro, xpc3pro, ypc3pro, zpc3pro GEANT: xpc1m, ypc1m, zpc1m, pc3mcid, xpc3m, ypc3m, zpc3m

  6. completeEvaluation ntuple. . . Particle generation, decay vertex, ID: generation, particleID, parentID, primaryID, rvtx, zvtx Emc shower position and energy: Reconstruced: xemcreco, yemcreco, zemcreco, emcecore, emcecorr,. . . Projected: xemcproj,yemcproj,zemcproj,pathlemc GEANT: xemcmc,yemcmc,zemcmc,. . Crk PMTs/pathlength: Reconstructed: crkacc, crknpmt0, crknpmt1, crknpmt3, crknpe0, crknpe1, crknpe3, crkchi2, crkdisp Projected: crkpath Tof time-of-flight: Reconstructed: xtofr, ytofr, ztofr, toftofr, elosstofr, pidtofr Projected: xtofpro, ytofpro, ztofpro, tofpath GEANT: xtofm, ytofm, ztofm, toftofm,elosstofm, pidtofm

  7. Pairs • Factorize corrections • Throw single parent distribution • according to physical distribution • events have 2 instead of 1 particle • corrections as for singles • Denominator in corrections • daughters within acceptance & kinematic cuts • separate correction for this • analytical for resonances with known decay kinematics • cannot do w/o model dependence for continuum • impose geometry/kinematic cuts on theory • Relation to singles corrections • 2D space, fit function to corrections • exchange systematic s for statistics

  8. HBT • Single particle corrections cancel • MC corrections for 2-particle acceptance, efficiency cutting into q space • MC to study residual correlation effects

  9. Higher pT needs • Full simulation of TEC tracking • tune as was done for DC • Modeling to optimize outer detector cuts • further response tuning? • Single particle events with full history • develop cleanup for pT>5 GeV/c • recall S/B now ~1 at 5 GeV/c • Separate check of multiplicity dependence

  10. Direct photons • Calorimeter analysis • understand showers to few % • embed showers/high statistics • systematic studies • specialized simulations • by the analyzers themselves • requires CPU availability • Via conversions • special runs in both data and MC • magnetic field • extra converter • systematics on e ID, kinematic cuts • described already by Akiba • Some full HIJING events for background study

  11. Summary • Few 100K central arm full HIJING events • also need muon full events… • but muon embedding important! • Many single particle runs • centralize generation & reco? • Common embedding study? • Pair acceptance studies • Resources for systematic studies • by analyzers themselves

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