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Published byFranklin Hampton Modified over 9 years ago
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Year -2 topics simulations needs for these Barbara Jacak March 2, 2001
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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- direct spin
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For analyses like this year HIJING events for N ch, E T, 0 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
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Charged singles corrections Throw single particles –flat in p T, 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 –TOF simulation being worked on now - will allow same cuts on MC & data Make corrections vs. p T –fit to remove statistical fluctuations Separate N ch dependence –by embedding tracks into real events –check that p T and N ch effects factorize
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completeEvaluation ntuple Event Vertex: eventxvtx, eventyvtx, eventzvtx Pc Vertex: Reconstructed: pc13vtxr GEANT: pc13vtxm Bbc Vertex and t 0 : 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
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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 completeEvaluation ntuple...
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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 for statistics
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HBT Single particle corrections cancel MC corrections for 2-particle acceptance, efficiency cutting into q space MC to study residual correlation effects
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Higher p T 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 p T >5 GeV/c –recall S/B now ~1 at 5 GeV/c Separate check of multiplicity dependence
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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
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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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