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Lepton Hard-Cut Parameters in the HADES

Lepton Hard-Cut Parameters in the HADES. Jacek Otwinowski. Y(pad). X(pad). Signal Evaluation in RICH. Ring pattern on the Rich pad plane. RICH observables: Pattern matrix amplitude – hit pad distribution Pattern geometry – ring centroid Number of fired pads in pattern

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Lepton Hard-Cut Parameters in the HADES

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  1. Lepton Hard-Cut Parameters in the HADES Jacek Otwinowski

  2. Y(pad) X(pad) Signal Evaluation in RICH Ring pattern on the Rich pad plane. • RICH observables: • Pattern matrix amplitude – hit pad distribution • Pattern geometry – ring centroid • Number of fired pads in pattern • Average charge collected in pattern Typical measured ring properties. Red lines show a minimum bias cuts used in the lepton analysis. RICH is almost blind to hadrons at SIS energies!

  3. Lead converters e- Lepton identification in Pre-Shower e+/e- create electromagnetic shower Fthr threshold (CL 80%) and Sumthrupper limit (CL 95%). Simulation

  4. e- e+ linear z axis ! - + p p + e+ v/c - e- log. z axis ! - q·p [MeV/c] Single e+/e- Reconstruction LVL2 Trigger LVL1 Trigger On-line RICH + META Off-line Analysis: Tracking+ Ring Hard-Cuts + Shower Conditions log. z axis ! e+ e-/e+ e-

  5. Lepton Hard Cut Parameters Generation Input ROOT File: HPidTrackCand(Sim) HPidTrackData HPidHitData • pidutil/tools/HardCutParameters (CVS) • README • projectNtuple/ • projectHistograms/ • makeParams/ Project to ntuple Ntuple: Rich/Shower/Tof/Tofino hit variables Kick/Spline/RungeKuttavariables denoted by small _k, _s and _r Project to histograms Root File: HPidHistogramsCont object keeps histograms with parameterisations of hard cuts: Beta vs P (Tof/Tofino) maxF vs P Sum0 vs P Ring Properties Histograms: P vs Beta maxF vs P Sum0 vs P Ring Properties … Make Params (Kick/Spline/RungeKutta)

  6. Project to Ntuple Input ROOT File: HPidTrackCand(Sim) HPidTrackData HPidHitData • pidutil/tools/HardCutParameters/projectNtuple • README • hydraIncludes.h (contains all hydra includes) • projectPidNtuple.h • projectPidNtuple.cc (Hydra reconstructor class) • anaProjectPidNtuple.cc (main program) • Makefile • Quick Start • Set ROOT/HYDRA enviroment • Edit anaProjectPidNtuple.cc and change context (”simulation” or ”real”) • Make anaProjectPidNtuple executable make • Run anaProjectPidNtuple anaProjectPidNtuple [inFileName] [outFileName] [nEvents] Project to ntuple Ntuple: Rich/Shower/Tof/Tofino hit variables Kick/Spline/RungeKuttavariables denoted by small _k, _s and _r

  7. Project to Histograms Ntuple: Rich/Shower/Tof/Tofino hit variables Kick/Spline/RungeKuttavariables denoted by small _k, _s and _r • pidutil/tools/HardCutParameters/projectHistograms • README • projectPidHisto.h • projectPidHisto.cc (ROOT based projection class MakeClass()) • anaProjectPidHisto.cc (main program) • Makefile • Quick Start • Set ROOT/HYDRA enviroment • Make anaProjectPidHisto executable make • Run anaProjectPidHisto anaProjectPidHisto [inFileName] [outFileName] [nEvents] Project to histograms Histograms: P vs Beta maxF vs P Sum0 vs P Ring Properties …

  8. Make Params Histograms: P vs Beta maxF vs P Sum0 vs P Ring Properties … • pidutil/tools/HardCutParameters/makeParams • README • setHydraIncludes.C (macro to set $HYDRA_INCLUDES, it must be run in front of others) • makeRichParams.C (make/set Rich parameters PM, RC, NP and AC) • makeBetaParams.C (make Beta vs P windows) • makeShowerParams.C (make maxF vs P and Sum0 vs P parameters) • makeHardCutPidParams.C (master macro to combine all hard cuts parameters) Look into HPidHistogramsCont class to understand parameter format! • Quick Start (Beta vs P windows) Edit makeBetaParams.C • select momentum reconstruction algorithm • set the beta lower and upper limit for the fit • set proper context = "sim" or "exp" • set input histogram file • set momentum steps (MOM_STEP[]= {0,300,600}) • set beta window (how many sigmas; SIGMA_FACT=3.0) Run macro • root -l setHydraIncludes.C • root> .x makeBetaParams.C+ Hard-Cuts Parameters are in ORACLE for CC at 1-2AGeV beams! Make Params (Kick/Spline/RungeKutta) Root File: HPidHistogramsCont object keeps histograms with parameterisations of hard cuts: Beta vs P (Tof/Tofino) maxF vs P Sum0 vs P Ring Properties

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