-
Higgs Studiesin the4th Concept Corrado GattoINFN Napoli/LecceOn
behalf of the 4th Concept Collaboration
TILC09 - Corrado Gatto
-
4th Concept Software Framework: ILCrootCERN architecture (based
on Alices Aliroot)Full support provided by Brun, Carminati,
Ferrari, et al.Uses ROOT as infrastructureAll ROOT tools are
available (I/O, graphics, PROOF, data structure, etc)Extremely
large community of users/developersTGenerator for events
generationVirtual Geometry Modeler (VGM) for geometry Virtual
Montecarlo for particle transportGrowing number of experiments have
adopted it: Alice (LHC), Opera (LNGS), (Meg), CMB (GSI),
Panda(GSI), 4th Concept, LHeC and the forthcoming International
Dual Readout Collaboration Six MDC have proven robustness,
reliability and portabilityDo not Reinvent the wheelConcentrate on
Detector studies and Physics
TILC09 - Corrado Gatto
-
From Bangalore to Now:Detectors in ILCroot4th Concept
BaselineVTX: from SiD scaled to 3.5 Tesla (original version)Drift
Chamber: 2nd versionFiber Triple Readout Calorimeter: 3 versionMuon
Spectrometer: Original versionNew additions:Crystal Triple Readout
Calorimeter Included into the LoIFTD (from SiLC) Did not make it
into the LoIAlso availableVTX Detectors: Original SiD Central
Trackers: TPC, Si-Strips (SID01), SPT (Pixel Tracker)
Total: 10 subdetectors (16 versions), most of them with full
simulation
TILC09 - Corrado Gatto
-
The Virtual Montecarlo ConceptVirtual MC provides a virtual
interface to Monte CarloIt allows to run the same user application
with all supported Monte Carlo programsThe concrete Monte Carlo
(Geant3, Geant4, Fluka) is selected and loaded at run timeCompare
Montecarlo performance and possible flows Choose the optimal
Montecarlo for the study
TILC09 - Corrado Gatto
-
Physics Studies in the 4th ConceptDetector simulation frozen in
July 2008 (except Ecal). Simu & Reco started August 2008Several
event samples used:4th Concept (Pandora-Pythia, Whizard, Evtgen,
etc,..)ILD sample for LOI (many thanks to Frank and Akiya)KEK
sampleFluka and Geant4 (through VMC)Not only ILCroot: MarlinKinFit
& Rave99% computing resources are from FermilabILCroot is
freely available at
Fermilabhttp://ilc.fnal.gov/detector/rd/physics/technical/resources/ilcroot.shtml
TILC09 - Corrado Gatto
-
Processing FlowVMCSteerReconstructionLocal tasksGlobal tasksAll
detectors are fully simulated (except gaussian smearing of hits in
the Muon Spectrometer):Local tasksLocal tasks
TILC09 - Corrado Gatto
-
Recoil massanalyses
TILC09 - Corrado Gatto
-
e+e- -> ZoHo -> m+ m- X s=250 GeVOlder AnalysisKEK event
sample for signal and SM backgroundISR and beam spread (0.25%)
included-80% e- polarization, +30% e+ polarizationAdd GuineaPig
events at digitization step (1BX for DCH and 10BX for VTX)Geant4
for particle transport of signal eventsGeant4 for particle
transport of beam background eventsNo calorimetry used
signalbkgndDCH Occupancy
Final Statee+e- -> HZ; H->X, Z->mme+e- -> ZZ;
Z->X, Z->mm
TILC09 - Corrado Gatto
-
e+e- -> ZoHo -> m+ m- X s=250 GeVOlder Analysis
Results
TILC09 - Corrado Gatto
-
e+e- -> ZoHo -> m+ m- X s=250 GeVfrom LOI
signalbkgndILD event sample for signal and SM backgroundISR and
beam spread (0.3%) included+100% e- polarization, -100% e+
polarizationAdd GuineaPig events at digitization step (1BX for DCH
and 10DX for VTX)Fluka for particle transport of signal
eventsGeant4 for particle transport of beam background
eventsECAL+HCAL with implementation of Triple Readout
Worst caseScenarioLarge W+W- background
TILC09 - Corrado Gatto
-
e+e- -> ZoHo -> m+ m- X s=250 GeVAnalysis strategyInitial
cuts to reduce background
Require two tracks in the Muon Spectrometer
G. Tassielli, G. Terracciano, M. Peccarisim+m- efficiency vs
PSingle m- efficiency vs P
TILC09 - Corrado Gatto
-
e+e- -> ZoHo -> m+ m- X s=250 GeVResolution of Muon
Spectrometer
G. Tassielli, G. Terracciano, M. Peccarisi
TILC09 - Corrado Gatto
-
e+e- -> ZoHo -> m+ m- X s=250 GeVResults
G. Tassielli, G. Terracciano, M. PeccarisiFinal cuts for S/N
enhancement
TILC09 - Corrado Gatto
-
e+e- -> ZoHo -> m+ m- X s=250 GeVResolutions
G. Tassielli, G. Terracciano, M. PeccarisiResults affected by
Mm=0(and consequentm brehemstralung)
Recoil MassFromMC Truth
TILC09 - Corrado Gatto
-
e+e- -> ZoHo -> e+ e- X s=250 GeVfrom LOI
signalbkgndILD event sample for signal and SM backgroundISR and
beam spread (0.3%) included+100% e- polarization, -100% e+
polarizationAdd GuineaPig events at digitization step (1BX for DCH
and 10DX for VTX)Fluka for particle transport of signal
eventsGeant4 for particle transport of beam background
eventsECAL+HCAL with implementation of Triple Readout
TILC09 - Corrado Gatto
-
e+e- -> ZoHo -> e+ e- X s=250 GeVECAL is crucial in this
analysis
G. Tassielli, G. Terracciano, M. Peccarisie- energy resolution
from VTX+DCHe- energy resolution from VTX+DCH+ECAL
TILC09 - Corrado Gatto
-
Particle Identification with Triple Readout45 GeV
particlesepmepmILCRoot simulationNew resultswith neutrons
contribution
TILC09 - Corrado Gatto
-
e+e- -> ZoHo -> e+ e- X s=250 GeVAnalysis strategyInitial
cuts to reduce background
Require two electrons in the ECAL/DCH
Final cuts for S/N enjhancement
G. Tassielli, G. Terracciano, M. Peccarisie+e- efficiency vs
Eeee = 93.4%Purity= 98.2% e+e- efficiency vs qeee = 93.4%Purity=
98.2%
TILC09 - Corrado Gatto
-
e+e- -> ZoHo -> e+ e- X s=250 GeVusing VTX +
DCHResults
G. Tassielli, G. Terracciano, M. PeccarisiRecoil MassRecoil mass
resolutione+e- mass resolution
TILC09 - Corrado Gatto
-
e+e- -> ZoHo -> e+ e- X s=250 GeV using VTX + DCH +
ECALResults
G. Tassielli, G. Terracciano, M. PeccarisiRecoil MassNeed a
better integration of the informations from tracking and
calorimetryRecoil mass resolutione+e- mass resolutionLong tails
disappeard
Mass shiftappears
TILC09 - Corrado Gatto
-
Jet analyses
ILD event sample for signal and SM backgroundKEK for WWnn and
ZZnn analysisISR and beam spread (0.3%) included+100% e-
polarization, -100% e+ polarizationNo beam backgroundFluka for
particle transport of signal eventsNo ECAL
TILC09 - Corrado Gatto
-
Jet reconstrucion:combine calorimetric and tracking
informations
(work in progress)
A. Mazzacane
TILC09 - Corrado Gatto
-
Jet Reconstruction Strategy
TILC09 - Corrado Gatto
-
Jet Reconstruction StrategyJet axis 1Jet axis 2Use informations
from tracking Systems only
TILC09 - Corrado Gatto
-
Jet Reconstruction StrategyCone 1Cone 2Use informations from
tracking calorimetry onlyWith recursive ycut
TILC09 - Corrado Gatto
-
Jet Reconstruction StrategyOutlierJet axis
2OutlierOutlierOutlierUse combinedinformations from tracking and
calorimetry
TILC09 - Corrado Gatto
-
Jet Reconstruction StrategyMuonInclude muon spectrometer
TILC09 - Corrado Gatto
-
e+e- -> ZoHo -> nn X s=250 GeV from LOI
ILD event sample for signal and SM backgroundISR and beam spread
(0.3%) includedNo Beam backgroundFluka for particle transport of
signal eventsOnly HCAL with implementation of Triple Readout (ECAL
implemented later)
signal2 jetsbkgnd4 jetsbkgnd
Final Statee+e- -> HZ; H->qq, Z->nne+e- -> HZ;
H->qq, Z->qqe+e- -> W+W- ->qq lne+e- -> ZZ ->qq l
l
TILC09 - Corrado Gatto
-
e+e- -> ZoHo -> nn X s=250 GeVA. MazzacaneDisentangle
2-jets from multi-jets events
Reduce ZZ and WW background
Reject prompt muons (via the Muon Spectrometer) from leptonic WW
decay
e+e- -> HZ ->qq nn+e+e- -> ZZ ->qq nn
Already studied
TILC09 - Corrado Gatto
-
e+e- -> ZoHo -> nn X s=250 GeV Results
Next step is to consider e+e- -> ZZ ->qq nnande+e- ->
ZZ ->qq qqe+e- -> W+W- ->qq qq
signalA. MazzacaneWWZZRave Flavour taggingccbbudsRecoil Mass(no
4-jet survivors)
TILC09 - Corrado Gatto
-
e+e- -> ZoHo -> nn cc + ZZ BackgroundSignal + ZZ
backgroundRequires 2 jets from jet-finderEvis > 130 GeV
No flavor taggingFit with three gaussians Selection Efficiency =
80.2%1% Error on the massTriple ReadoutCompare with our previous
analysisUsingKEK data (thanks to A. Myamoto)
TILC09 - Corrado Gatto
-
e+e- -> ZoHo -> 4 jets analyses
(work in progress)
TILC09 - Corrado Gatto
-
e+e- -> ZoHo ; and Zo->cc Ho->bb s=250 GeVF.
IgnatovAnalysis strategySelect Event with 4 jets (use jet finder
with recursive ycut)Ecalo + E muon cut to reduce background(events
with neutrino or ISR)5-C kinematic fit to all possible jet-jet
combinations
Pick combination with highest probabilityFinal cut: c2/ndf
-
e+e- -> ZoHo ; Zo->uu Ho->cc s=250 GeVY. C.
ChenAnalysis strategySelect Event with 4 jets (use jet finder with
recursive ycut)Select Mj1j3 and Mj2j4Requires 1 combination within
10 GeV from nominal Z massPlot the other combination
Signal onlyNo BackgroundEvents with significant Emiss
(neutrinos)Analysis is still in progress
TILC09 - Corrado Gatto
-
W/Z Mass Separation KEK event sampleSimple Durham jet-finder a
la L3 (recursive ycut) used for this analysis No combined
information with tracking yet (3 entries/evt)No ECAL4-jets finding
efficiency: 95%A. Mazzacane
TILC09 - Corrado Gatto
-
Status and PerspectivesILCroot framework is stable and very
fastIt runs smoothly on the GRID at FNALVery detailed simulation
& reconstruction takes 20-60/eventMost of the effort by the 4th
Concept Simulation group has been put into implementing the
baseline detectors + several optionsSome work on the detectors is
still needed (detector optimization and SILC+CLUCOU)Lots of Physics
studies will followAdd other background sourcesAnybody is welcome
on board
TILC09 - Corrado Gatto
-
Backup slides
TILC09 - Corrado Gatto
-
Event Display in ILCrootLow pt secondary muone+e- -> HoHoZo
-> 4 jets 2 muonsECM = 500 GeV
TILC09 - Corrado Gatto
-
OutlineThe simulations in the 4th ConceptILCrootDetector
simulations Performance & OptimizationPhysics benchmarks for
the LoIFuture prospects
TILC09 - Corrado Gatto
-
The Virtual Montecarlo ConceptVirtual MC provides a virtual
interface to Monte CarloIt allows to run the same user application
with all supported Monte Carlo programsThe concrete Monte Carlo
(Geant3, Geant4, Fluka) is selected and loaded at run timeCompare
Montecarlo performance and possible flows Choose the optimal
Montecarlo for the study
TILC09 - Corrado Gatto
-
4th Concept Software Strategy: ILCrootCERN architecture (based
on Alices Aliroot)Full support provided by Brun, Carminati,
Ferrari, et al.Uses ROOT as infrastructureAll ROOT tools are
available (I/O, graphics, PROOF, data structure, etc)Extremely
large community of users/developersTGenerator for events
generationVirtual Geometry Modeler (VGM) for geometry Based on
Virtual MontecarloCould it ever evolve into a general purpose
entity for the HEP community (as ROOT)?Growing number of
experiments have adopted it: Alice, Opera, CMB, (Meg), Panda, 4th
ConceptSix MDC have proven robustness, reliability and
portabilityDo not Reinvent the wheelConcentrate on Detector studies
and Physics
TILC09 - Corrado Gatto
-
Dual Readout CalorimetryTotal calorimeter energy: use two
measured signals and two, energy-independent, calibration
constantsFrom calibration@ 1 Energy only
Non-gaussianNon-gaussiangaussian40 GeV p
TILC09 - Corrado Gatto
-
Improving the Energy Resolution: The Effect of Neutrons45 GeV
-ILCRoot simulation
TILC09 - Corrado Gatto
-
From Dual to Triple ReadoutInclude the effect of neutrons45 GeV
-ILCRoot simulationTriple readout aka Dual Readout with time
history readout
TILC09 - Corrado Gatto
-
Compensation withECAL and HCALGet EScint and ECer from ECAL
(disregard neutrons as ZBGO >> 1)Get EScint, ECer and Eneutr
from HCALThen:
Estimate hC, hS and hneu from a 45 GeV run (p- and e-) by
minimizing the spread of Etot
TILC09 - Corrado Gatto
-
Calorimeter Response for 45 GeV e-
TILC09 - Corrado Gatto
-
80 GeV jet with escaping particlesILCRoot simulation
TILC09 - Corrado Gatto
-
m+ m at 3.5 GeV/cILCRoot simulation
TILC09 - Corrado Gatto
-
Jet reconstrucion:combine calorimetric and tracking
informations
(work in progress)
TILC09 - Corrado Gatto
-
Jet Reconstruction StrategyMuon
TILC09 - Corrado Gatto
-
SummaryWorst case polarization scenario considered: largest WW
background
TILC09 - Corrado Gatto