Attività di Offline nel progetto SPD

Attivit di Offlinenel progetto SPDDomenico Elia (INFN Bari)

II Convegno Nazionale sulla Fisica di ALICEVietri sul Mare (SA), 30 Maggio - 1 Giugno 2006

II Convegno Fisica di ALICE / Vietri, 30 Maggio - 1 Giugno 2006

Attivit di Offline nel progetto SPD

Contents Main issues in the SPD Offline: Detector response simulation (diffusion model) Alignment and calibration Reconstruction (multiplicity with tracklets) Trigger (Fast-OR based MB pp selection) Analysis studies in Bari: Additional FO applications (high multiplicity pp, etc) Contribution to 1st Physics Paper Secondary vertex and charm reconstruction


Attivit di Offline nel progetto SPD Physics goals: primary vertexing secondary vertexing for open charm and beauty L0 trigger in pp multiplicity

The SPD in ALICE



SPD spatial precision Measurements in beam tests: H4 line at the CERN SPS, 350 GeV/c proton beam measurements at different thresholds



SPD spatial precision Residuals in the short pixel side (y ) coordinate:yx425 mm50 mmLy / 12 = 14.4 mm



Response simulation Two models compared with beam test data:Track impact position on the pixel cell

diffusion model better suited for precision studies



Response simulation Updates in the diffusion model code: speeding-up of the diffusion algorithm (B.S. Nilsen) fine tuning of diffusion parameters (G.E. Bruno, R. Santoro):x-x0y-y0Fdv = sensor thickness / bias voltageFda = asymmetry parameter for the x/y diffusionFcr = coupling along the row direction (percentage of charge)



Response simulation Updates in the diffusion model code: fine tuning of diffusion parameters (contd):



Response simulationLayer 1: ladders at 0o wrt radial direction at ladder edges: track angle 10o Updates in the diffusion model code: fine tuning checked to work at different thresholds detailed cross-check on the spatial precisions: for different cluster patterns at different track inclination anglesLayer 2: ladders at 18o wrt radial direction at ladder edges: track angle 18o 5o



Response simulation Updates in the diffusion model code: fine tuning checked to work at different thresholds detailed cross-check on the spatial precisions: for different cluster patterns at different track inclination angles

Spatial precision (mm) Exp. data vs Simulation0510All clusters10,410,29,49.29,18.3Single pixel11,410,710,29,68,37,3Double-y clusters6,46,97,37,19,58,4



Geometry and alignment Basic ideas for PDC06: produce hit and digits with misplaced geometry ITS-TPC and intra-ITS alignments critical for strangeness and charm amount of displacement: expected residual mis-alignment after standard software alignment for the SPD ladders: 10 mm in rj, 20 mm in Z, 0.3 mrad rotation global ITS shift: 50 mm reconstruction and tracking with nominal geometry: check the effect of residual mis-alignment on physical quantities (e.g. decrease of tracking and vertexing performances)



Calibration and preprocessing Basic ideas: create a framework to use calibration objects: partially implemented (E. Crescio, M. Masera, L. Gautichet, B. Nielsen) create preprocessing: classes to fill data members of calibration objects (i.e. calibration data) link to input sources: e.g. DAQ (calibration runs), DCS pioneering work, existing preprocessor class for SPD (P. Nilsson) basic need for PDC06: run simulation with reasonable de-calibration (i.e. how many dead channels, how distributed in the modules, etc)



Calibration and preprocessing - 1% dead pixels - 1% dead chips - 5% dead columns in 5% of the chips - 5% dead modules (2 inner, 4 outer layer) input SPD dead channels (CDB file for PDC06):



Trigger (Fast-OR) The basic idea: the SPD layout:

each SPD chip outputs a digital signal (FO) if >=1 pixel is fired full SPD can provide a total of 1200 FO signals (400 from the inner layer + 800 from the outer layer) FO signal combinations can provide an input for the L0 trigger (within a timing constraint of 900 nsec)



Trigger (Fast-OR) Fast-OR as minimum bias trigger in p-p studies by J. Conrad, J.G. Conteras and C. Jorgensen full description in ALICE-INT-2005-025 simulated beam-gas and p-p collisions (PDC04 data) total of 10 possible SPD FO algorithms tested 18 possible MB trigger combinations investigated (SPD and VZERO) 3 possible MB trigger combinations finally proposed best candidate: MB1: (GLOBAL.FO) or (VZERO.OR) and (notBG) * * See ALICE-INT-2005-025, ALICE PPR vol.II chap.VI



Trigger (Fast-OR) Code implementation in AliRoot recent work in AliITSTrigger.cxx : updated trigger class (in collaboration with C. Jorgensen) two different methods implemented:MultiplicityTrigger() providing 2 basic inputs: ITS_SPD_GFO_L0 (for min-bias p-p) ITS_SPD_HMUL_L0 (for high-multiplicity p-p)GeometricalTrigger() left for additional inputs (not activated) based on topological correlation between Fast-ORs e.g. trigger for HMPID in p-p trigger for ultra-peripheral in Pb-Pb



Trigger (Fast-OR) New data samples: larger statistics wrt to previous studies (factor 5) full production done on the Bari PC-farm sample of p-p minimum bias: AliRoot v4-03-06 (PDC05 compatible version) Config = PYTHIA 6.214, kPyMb process total statistics currently available: 50 K events sample of beam-background: same AliRoot version, HIJING generation of pO collisions vertex Z in [-50m,+30m] (beam-gas, beam-halo) total statistics currently available: 20 K events



Trigger (Fast-OR) Minimum bias trigger: cross checks with existing results** See ALICE-INT-2005-025, ALICE PPR vol.II chap.VI50K pp eventsCharged multiplicity in || < 1.5



Trigger (Fast-OR)



Trigger (Fast-OR)Efficiency on pp:but: MB2 more effectiveon bkg rejection

NDSDDDINELMB11.000.740.880.94MB20.990.600.690.88



Trigger (Fast-OR) Minimum bias trigger (contd) new features implemented in the analysis code SPD dead channels as from CDB file for PDC06 (~ 6% dead) FO inefficiency parameter effect on the MB trigger negligible effect on multiplicity selection being checked Multiplicity trigger analysis ongoing, current results in the next slides



Trigger (Fast-OR)



Trigger (Fast-OR)nFO > 100nFO > 150nFO > 200



Multiplicity reconstruction Tracklets for multiplicity (T. Virgili) analysis macro finalized, tested (fake associations estimated) coded in a new class: AliITSMultReconstructor.cxx checks on PDC06 data ongoing

Contribution to 1st Physics paper: multiplicity measurement in pp collisions @14 TeV coordinated effort for the SPD part (with Tiziano) few main issues to be finalized (see next slide)



Contribution to 1st Phys. Paper Main issues for the SPD: Data selection mult reconstruction implemented in the trigger analysis code trigger studies and effects on multiplicity: to be finalized Vertex determination < 1 mm precision required no-vtx events: using clusters on the 1st layer, clusters in the ESD ? Corrections acceptance, decays, rec-efficiency: already done background (beam-gas): to be estimated dN/d estimation sistematics (from corrections): being evaluated



Secondary vertex and charm Ongoing activity: Secondary vertexer performance (R. Romita) checks (eg CPU consumption) of the standard vertexer comparison with an alternative method (D. Di Bari, for charged kaons) Charm decay channels in pp (G.E. Bruno, R. Romita) DS ( K K p ), LC ( p K p ) decays test sample of p-p events: AliRoot v4-04-Rev01 (PDC06 version) Config = kCharmpp14000wmi process, kHadr decay total statistics currently available: 16K events



Summary Offline for the SPD: main updates and developments for the PDC06 done geometry, calibration issues in evolution multiplicity and trigger codes up to date Analysis activity: work for 1st Physics Paper ongoing additional Fast-OR trigger combinations under study vertex and charm reconstruction just started


Attività di Offline nel progetto SPD

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