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Fiducial cut study & recalibrator update

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

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Fiducial cut study & recalibrator update

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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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