1. ILC Software Meeting, Orsay 05/07
Reconstruction Aspects for the Higgs-Recoil-Analysis under realistic conditions
M. Ohlerich
11/17/2018
ILC Software Meeting, Orsay 05/07

2. ILC Software Meeting, Orsay 05/07
Outline
Introduction
Tracking issues
Clustering issues
Particle ID issues
Higgs-Recoil-Mass issues
11/17/2018
ILC Software Meeting, Orsay 05/07

3. ILC Software Meeting, Orsay 05/07
Our Collaboration
DESY (Zeuthen): W. Lohmann, M.O.
(Hamburg): K. Wichmann
MPI (München): A. Raspiareza
LAL (Orsay): H. Li, R. Pöschl, M. Ruan
11/17/2018
ILC Software Meeting, Orsay 05/07

4. ILC Software Meeting, Orsay 05/07-
Our Task Z l +
Higgs-Strahlungs- Process:
Higgs-Recoil-Mass
Coupling Strength (model independent) H
11/17/2018
ILC Software Meeting, Orsay 05/07

5. ... under realistic conditions
LDC01Sc
Whizard, Pythia
BHWIDE
Mokka
Marlin / MarlinReco
create events @ Ecms and mH=120GeV
include BS, ISR, FSR
detector-
simulation
full reconstruction
of isolated leptons
dilepton reconstruction
Higgs Recoil Mass
11/17/2018
ILC Software Meeting, Orsay 05/07

6. signal deterioration through ...
physical effects:
BS, ISR, FSR
detector effects (interaction with material)
reconstruction effects
Tracking (pT, θ, φ) (FullLDCTracking)
Clustering (p-E-mismatch) (TrackwiseClustering)
Particle Identification Efficiency (MOID)
11/17/2018
ILC Software Meeting, Orsay 05/07

7. ILC Software Meeting, Orsay 05/07
Tracking Issues - pT
Muons - from Z decay
single muons of discret energies
range
goal: Δ1/pT ~ 7 * 10-5 (GeV/c)-1
11/17/2018
ILC Software Meeting, Orsay 05/07

8. ILC Software Meeting, Orsay 05/07
Tracking Issues - pT
electrons from Z decay
counts
problems with electron
tracks
see talk of A. ECFA Software and Physics Simulation Phone Meeting
from 7. Feb. 2007
11/17/2018
ILC Software Meeting, Orsay 05/07

9. Tracking issues - angle resolution
azimuth angle
single muons
polar angle
muons from Z decay
11/17/2018

10. Tracking issues - impact parameters
R-φ-plane
single muons
muons from Z decay
R-z-plane
11/17/2018

11. Clustering issues electron cluster splitting
→ mismatch of cluster energy
and track momentum
after merging of
"satellite photons"
to electron clusters
in Wolf
11/17/2018

12. ILC Software Meeting, Orsay 05/07
Particle ID issues
MOID processor for MarlinReco:
likelihood method
2 classes : neutral and charged particles
charged: e, µ, π -- neutral: γ, neutral hadron (KL, n)
gauging by known sample of each particle type
PDFs = choosen variables like EECAL/Etotal
11/17/2018
ILC Software Meeting, Orsay 05/07

14. ILC Software Meeting, Orsay 05/07
Particle ID issues
State of Art:
gauge procedure = tricky: using MC info difficult for clusters
check procedure: " -
good separation of subclasses for single test particle, worse for dense events - not fully understood, yet.
single charged
particles: identified as
electrons 99% as electron, 1% as pion, 0% as muon
muons % as muon, 2.8% as pion, 0.2% as electron
pions 92% as pion, 7.5% as electron, 0.5% as muon
11/17/2018
ILC Software Meeting, Orsay 05/07

15. Particle ID issues likelihood for muons likelihood for electrons
11/17/2018

16. Higgs Recoil Mass issues
Find isolated leptons
Find proper matching with invariant mass coincides with Z-mass
Reduce fake signal events from background
Find proper description of signal peak
11/17/2018
... to be LCWS

17. ILC Software Meeting, Orsay 05/07
Further steps ...
additional information from global topology ...
Katarzyna Wichmann
Efficiency: 87.5% for di-jet reconstruction
11/17/2018
ILC Software Meeting, Orsay 05/07

18. ILC Software Meeting, Orsay 05/07
Backup Slides
11/17/2018
ILC Software Meeting, Orsay 05/07