The LiC Detector Toy M. Valentan, M. Regler, R. Frühwirth Austrian Academy of Sciences Institute of High Energy Physics, Vienna InputSimulation ReconstructionOutput The MATLAB program allows a fast evaluation of the optimal resolution for charged particles with uncorrupted data. Detector inefficiency and multiple scattering are included. Detector surfaces can be cylinders or planes. Track fitting uses the Kalman filter, a recursive least-squares estimator. It proceeds from the outermost layer towards the beam tube. Initialization of the track parameters with large errors Extrapolation Detector loop Propagate track parameters, using a reference track and a linearized model Linear error propagation Add multiple scattering Update Compute weighted mean of extrapolated track parameters and measurement Compute local χ 2 statistic and accumulate total χ 2 Store final track parameters, error matrix and total χ 2 Track parameters , ,  (according to the chosen multiplicity). The state vector is propagated to the beam tube, where it is transformed to variables similar to the DELPHI- convention ,z, , including spatial variables. Event loop Track loop By default the event loop first generates a vertex (uniformly distributed in a certain range). However, the user can enter the vertex positions (x 0,y 0,z 0 ), provided by an arbitrary vertex generator. The track model is a helix. Tracking includes multiple scattering. Track simulation Momentum variables Multiple scattering takes place on every massive barrier, using independent normal distributed random quantities (according to the Highland formula). A local cartesian coordinate system is used with one axis tangent to the track. Measurement of R  and z' (according to stereo angle chosen) Strips, Pads or normal distributed uncorrupted data only Coordinates Arbitrary inefficiency without spatial or angular dependence Strip detectors (single layer and double sided; inner layer with any stereo angle) Pixel detectors (by crossing 2 strip detectors with strictly correlated inefficiency) Simulation of digital and normal distributed errors. The z dependence in the TPC can be used as an example for a template. Reconstruction Pull quantities MC residuals (fitted - true) Monte-Carlo pulls Phi z theta beta kappa mean: std: Pulls at innermost detector RPhi z u v mean: std: Chi^2 ndf: mean: At the beam tube Test statistics (sample log file, tracks) R , z – barrel region u,v - forward region Average number of degrees of freedom Barrel regionForward region track with <  Up:Monte-Carlo residuals at the beam tube, computed from generated and fitted state vectors Left:Relative deviation  p T /p T Right:Relative deviation  p T /p T track with <  Up:Monte-Carlo residuals at the beam tube, computed from generated and fitted state vectors Left:Relative deviation  p T /p T Right:Relative deviation  p T /p T 2 Scale factor relative to the barrel region: 50 Scale factor relative to the barrel region: 100 Track loop 20 Inner Tracker (IT) Number of layers : 5 23 Radii [mm] : 90, 90, 160, 300, Upper limit in z [mm]: 110, -90, 360, 640, Lower limit in z [mm]: 90,-110, -360, -640, Efficiency Rphi: 0, 0, 0.95, 0.95, 0 27 Efficiency 2nd layer (eg. z): -1, -1, 0.95, 0.95, Stereo angle alpha [Rad]:10*pi/ Thickness [rad. lengths]:0.07,0.07,0.0175,0.0175, error distribution: normal-sigma(RPhi) [1e-6m]: 32 sigma(z) [1e-6m] : 33 1 uniform-d(RPhi) [1e-6m] :50 34 d(z) [1e-6m] :50 Number of events rsp. tracks Momentum and direction Vertex Simulation features Test features Output features Simulation Parameters Detector Description Frame Detector 1 Detector 2 Coaxial cylinders - Stereo angle -  in T PC z dependent Plane wheels - Coordinates defined by two angles Arbitrary size and position 2D measurement - single and passive layers steered by inefficiency Strips or pads Start parameters uniformly distributed in the defined ranges Simulation features: - Multiple scattering - Measurement errors Test features: - Pulls and MC-pulls -  ² Output features: - Histograms of pulls - Histograms of residuals - 6D cartesian, Harvester