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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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signal evaluation in rich

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!

lepton identification in pre shower

Lead converters

e-

Lepton identification in Pre-Shower

e+/e- create electromagnetic shower

Fthr threshold (CL 80%) and Sumthrupper limit (CL 95%).

Simulation

single e e reconstruction

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-

lepton hard cut parameters generation
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)

project to ntuple
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

project to histograms
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

make params
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