Photonic electron reconstruction efficiency via weight method

Used MC

  • LHC12a17d : 2M, 0-10% Centrality
  • Compare pi0->e reconstruction efficiency from HIJING and enhanced sample
  • Enhanced sample : *re-wieghted : = dN/dpT(HIJING pi0 ) / dN/dpT(Enhanced pi0)

Input pi0 spectra

Pic_pi0Input.png
  • Separated pi0s come from HIJING and enhanced samples
  • Weight for enhanced pi0 : w = dN/dpT(HIJING pi0 ) / dN/dpT(Enhanced pi0)
  • Separation :
    Int_t label = TMath::Abs(track->GetLabel());
    Bool_t MChijing = fMC->IsFromBGEvent(label);
    False if it is enhanced sample

Decay electron (pi0->e) pT spectrum

pi0-> e (all after eID cuts)

Pic_pi0_comp0.png
  • pi0->e spectrum with TPC+EMCal PID (denominator)
  • Enhanced + Weight : Fill electrons from enhanced pi0 sample with the weight.
    • TH1D *hdecayPi0e->Fill(pT,;
    • get grand parent or parent (in case, it's Dalitz decay) pT of the electron to calculate the weight.
  • There are small difference between HIJING and weighted enhance result => maybe the pi0 fitting was not perfect

pi0-> e (reconstructed via invariant mass)

Pic_pi0_comp1.png
  • pi0->e spectrum reconstructed via invariant mass (numerator)
  • Enhanced + Weight : Fill electrons from enhanced pi0 sample with the weight.

Reconstruction efficiencies

eff_pi0_comp1.png
  • HIJING vs. Enhance + weight
  • not subtracted LS contributions

Comp_eff_wwo_weight.png

  • Enhanced pi0 with/without weight
  • after subtracting LS contribution

background subtraction check

  • Check background subtraction works in enhanced sample
    • not require electrons come from same parent (ULS-LS)
    • require electrons come from same parent (ULS)
Pic_effComp.gif
/u/shingo/WRK_eliza8/2012/10/15
LEGO train 56 MC (v5-03-69-AN)

Need to check

  • check another photonic electron contributions : especially eta

/Users/shingo/WRK/Dayana/2012/10/05/LEGO55_0719_PF
/u/shingo/WRK_eliza8/2012/10/02
LEGO train 54 MC (v5-03-65-AN)

-- ShingoSakai - 03-Oct-2012

-- ShingoSakai - 24-Oct-2012

Topic attachments
I Attachment History Action Size Date Who Comment
PNGpng Comp_eff_wwo_weight.png r1 manage 9.7 K 2012-10-24 - 08:31 Ssakai  
GIFgif Pic_effComp.gif r1 manage 10.2 K 2012-10-24 - 08:31 Ssakai  
PNGpng Pic_pi0Input.png r1 manage 10.5 K 2012-10-24 - 08:31 Ssakai  
PNGpng Pic_pi0_comp0.png r1 manage 13.5 K 2012-10-24 - 08:31 Ssakai  
PNGpng Pic_pi0_comp1.png r1 manage 10.0 K 2012-10-24 - 08:31 Ssakai  
PNGpng eff_pi0_comp1.png r1 manage 9.9 K 2012-10-24 - 08:31 Ssakai  
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Topic revision: r4 - 2014-06-09 - ShingoSakai
 
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