Samir Ferrag

1
Status of AtlfastC (Efficiencies contaminations
for ATLFAST)
Samir Ferrag Catherine Wright Christopher
Collins-Tooth Sarah Allwood
2
Introduction

• Since the last meeting Atlfast has been extended
  with AtlfastC to include efficiencies and
  mis-identification as was proposed
• AtlfastC use Parametrisation of the efficiencies
  and mis-identification from the full simulation
• The input particles used to compute the
  efficiencies and mis-identifications are
• Electron from Z?ee v11.0.42
• Photons from single g, H?gg, G?gg v11.0.42
• Muons from Z?mm v11.0.42
• Jets from gjet v11.0.42

3
Efficiencies and contaminations from the full
simulation
Generator
Atlfast
AtfastC Mis-id/ Efficiencies
ce-j
ceg
eee
e
e
e
egg
cge
cgj
g
g
g
Jet identification algorithm(s)
Electron identification algorithm(s)
Photon identification algorithm(s)
ejj
cj-g
cj-e
Jet
Jet
Jet



Written code
Full Simulation

• Efficiency histograms obtained from single
  particle samples generated and reconstructed
  private single particle samples.

4
Produced Efficiency Matrix Elements (EME)
Reconstructed candidates
e g m j
?ee
Ce?
Cem
Cej
???
Each ?xx and Cxya function of ? and pT
C?e
C?j
C?m
j m g e
Generated particles
?mm
Cm?
Cme
Cmj
?jj
Cj?
Cje
Cjm
?xx efficiency to remove candidates that full
would not be reconstructed by the full
simulation from the reconstructed lists
(Killing) Cxy Mis-id to add candidates (fakes,
contamination) to the reconstructed lists
5
EME for the Electron list
6
EME for the Photon list
7
EME for the Jet list (Cone R0.7)
8
EME for the Jet list (KT)
9
EME for the STACO-Muon list
10
EME for the Muid-Muon list
11
We need to

• Use larger samples of single particles
• Discuss the produced Efficiency Matrix elements
  in the corresponding performance groups.
• Define the jet-associated cluster object in the
  Particle-jet contamination method
  (particlee,m,g)
• Validate the AtlfastC Output in a busy
  environment (ttbar)
• Look at the different smearing in the
  contamination case (Jet is not smeared as a
  photon)