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Fiducial Cut Study and Recalibrator Update: VTX Software Meeting July 13, 2012

Procedure for defining run groups, checking stability, tuning simulation, and updating results using final cut parameters. Includes track and event cuts, and updates on recalibrator for VTX. Details on dividing run groups, stability assessment, and tuning parameters in 3D space. Specific instructions for setup and analysis provided.

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Fiducial Cut Study and Recalibrator Update: VTX Software Meeting July 13, 2012

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  1. Fiducial cut study & recalibrator update • 2012/07/13 • VTX software meeting • Ryohji Akimoto

  2. CNT fiducial cut study • Procedure • define run groups • check stability at the run groups • tune simulation and decide fiducial cut • tune in 3D parameter space : phi0, zed, and charge/pT • Track cut • event cut : BBC charge>50 && |BBC Z-vertex|<8cm • track cut : quality=31 or 63 && p>1GeV/c • e-ID cut : E/p>0.7 && n0>=3 && disp<5 && chi2/npe0<10 • Cut parameters are not enough. I will update results using final cut parameter set. • Use files made for QA for the study

  3. Define run group 1 < p(GeV/c) < 2 • Divide into 4 run groups • 1st-2nd : increase DCH dead area • 2nd-3rd : Magnetic field is inverted and repair work for VTXP was done (4th repair). • 3rd-4th : increase DCH live area 1 2 3 4 p(GeV/c) > 2

  4. Stability at run group 3 : phi0 • divide run group 3 into 4 small sub-run groups and compared them scaled by the number of events. before mask after mask phi0 [rad] phi0 [rad] difference at each bin is within statistical error

  5. Stability at run group 3 : zed before mask after mask zed [cm] zed [cm] difference at each bin is within statistical error.

  6. Fiducial cut for run group 3 • Tuning of simulation is not done since simulation data are not ready. But I made draft version of fiducial cut by checking dead area using data of a sub-run group. phi0 v.s. zed phi0 v.s. charge/pT

  7. Recalibrator update • I updated recalibrator for VTX • SvxCentralTrackRecalList, SvxCentralTrackRecal : output of the recalibrator • SvxCentralTrackRecalReco : basic part of recalibrator • SvxCentralTrackReFit : refitting module • location in CVS : offline/framework/recal/ • You need special setup to activate refitting module. See the following example. • /direct/phenix+hhj/akimoto/svx/ana/recal/ • Analysis class : see /direct/phenix+hhj/akimoto/svx/ana/recal/RecalAna.C and RecalAna.h • Analysis macro : /direct/phenix+hhj/akimoto/svx/ana/recal/wrk/run_compactCNT_example.C

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