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SI licon VE rtex T r A cker

SI licon VE rtex T r A cker. Rather than fixed common geometry the common analysis and simulation tools are needed. Such software package should provide : Standard analysis tools: hit, track, vertex reconstruction etc. (could be used as a base for future real data analysis)

callum-brooks
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SI licon VE rtex T r A cker

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  1. SIliconVErtex TrAcker Rather than fixed common geometry the common analysis and simulation tools are needed. Such software package should provide : • Standard analysis tools: hit, track, vertex reconstruction etc. (could be used as a base for future real data analysis) • Simulation tools: multiple scattering, Landau dE/dz etc. • Event display: debugging and visualization • Many more…. SIVETA

  2. SIVETA description • SIVETA is a simulation package invented for PHENIX Silicon upgrade R&D. It’s meant to be public lib. • Features implemented (10/25/01): • flexible geometry : allows to add any type of detector or inactive layer, vary the position, thickness, rotation etc. • Hit reconstruction: given the MC track in PHENIX lab frame the hits are reconstructed, Moliere scattering and dE/dz is performed. • Vertex and track reconstruction: the “Robust” vertex finding algorithm and “track finder” are (will be) implemented. • 2D Event Display: is ready, displays geometry, hits and tracks

  3. Technical notes • Easy to customize • Hit digitization (detector resolution). • Displaced vertex algorithm etc. • Root based • Vector manipulation (Tvectro3, TLorentzVector) • Collection Classes (TClonesArray) • Graphics

  4. Program description SIVETA home page under construction.

  5. SIVETA Event Display • Simple algorithm for hit associations • Finds the shortest vector connecting the track and collision vertex

  6. yield in Pythia Three decay channels are considered: Scaling fromppto AA according Glauber model: Minv [MeV] 317 1870 125 1865 62 2285

  7. Pythia pp No K-factor (with K5 Ncc 10) SPS s = 17GeV/c RHIC s = 200GeV/c

  8. Tracking and Displaced Vertex Pythia pp s = 200GeV/c Closest distance to coll. vertex True distance Mean=10 reconstructed distance =1 cm no. of tracks Displ. vert =280 m =140 m [cm]

  9. To Do list • Vertex reconstruction • Robust Vertex Fitter (exponential weights) • More advanced tracking • Vertex -> Si1 -> Si2 • Displaced vertex reconstruction • closest distance between 3 tracks in 3D (partially done) • Mass reconstruction • ??

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