1. MET Experience at UF Bobby Scurlock University of Florida
We won.

2. Intention
This is an example of how to use the MET reconstruction code at UF, intended mainly for new users of CMSSW, MET Reconstruction, and computing at UF.

3. MET & Jet ET (Inclusive Muon + Jet + MET)
Applied m Trig. + Presel.
MET & Jet ET (Inclusive Muon + Jet + MET)
Signal (black line) tends to harder jets
From earlier decays in sparticle cascades
Signal (black line) has distinctly harder MET
Due to LSP from R-parity conservation
Background (grey area) and Signal (black line) have similar (soft) muon pT spectrum
mSUGRA muons arise later in sparticle cascade decays
1st Jet
SM SUSY(LM1)
# Events for 10 fb-1
# Events for 10 fb-1
CMS NOTE-2006/134
> 440 GeV
> 130 GeV
ET (GeV)
MET (GeV)

4. MET & Jet ET (Inclusive Muon + Jet + MET)
Applied m Trig. + Presel.
MET & Jet ET (Inclusive Muon + Jet + MET)
Signal (black line) tends to harder jets
From earlier decays in sparticle cascades
Signal (black line) has distinctly harder MET
Due to LSP from R-parity conservation
Background (grey area) and Signal (black line) have similar (soft) muon pT spectrum
mSUGRA muons arise later in sparticle cascade decays
1st Jet
SM SUSY(LM1)
# Events for 10 fb-1
# Events for 10 fb-1
CMS NOTE-2006/134
> 440 GeV
> 130 GeV
ET (GeV)
MET (GeV)
M. Zielinski, CMS MET Days, Sept

5. CMSSW MET Software
MET is a very powerful tool to discover new physics, but very difficult to get right!
UF is charged with maintaining the CMSSW RecoMET Producer and RecoMET Validation code.
Most code development is done using the UF analysis cluster
Debugging and testing is performed both a UF and at FNAL’s UAF center

6. RecoMET/ /METProducer /METAlgorithms /test
Based on input type (either MC or CaloTowers), calls reconstruction algorithm, calculates MET and associated quantities, and stores them to event
/METAlgorithms
Called by METProducer, takes input collection and calculates MET and associated quantities
/test
Contains example .cfi and .cfg files

7. Setup Your Environment
Pick a city…

8. Go to your workspace… Make a project: Go in:
scramv1 project CMSSW CMSSW_1_2_0
Go in:
cd CMSSW_1_2_0
Set the CVSROOT environment variable:
cmscvsroot CMSSW
Check it out:
cvs co RecoMET
cvs co Validation/RecoMET
Compile it:
scramv1 b

9. Run the RecoMET Producer
cd to RecoMET/test
Open Example-RecoFromGenPythia.cfg
Underneath “untracked uint32 VtxSmeared = ” add
“untracked uint32 g4SimHits = 9876” …required in newer version of CMSSW
Change:
``include “RecoMET/METProducers/data/GenPythia-QCD_dijets_0_15.cff” ’’ to
``include “RecoMET/METProducers/data/GenPythia-QCD_dijets_1000_1100.cff” ’’
…this is a little more interesting to look at!
Change “PythiaSource.maxEvents = 2” to 10 events
Change “drop *” to “keep *” …so we don’t throw away reconstructed objects
Do: GenPythia-QCD_dijets_0_15.cff GenPythia-QCD_dijets_1000_1100.cff
Go in to this new file, and change the PtHat range to
Finally do: cmsRun Example-RecoFromGenPythia.cfg
Go get a cafecito…
The output is called “Example-RecoMET.root” which contains MET objects and CaloTowers.

10. Run the RecoMET Producer
cd to RecoMET/test
Open Example-RecoFromGenPythia.cfg
Underneath “untracked uint32 VtxSmeared = ” add
“untracked uint32 g4SimHits = 9876” …required in newer version of CMSSW
Change:
``include “RecoMET/METProducers/data/GenPythia-QCD_dijets_0_15.cff” ’’ to
``include “RecoMET/METProducers/data/GenPythia-QCD_dijets_1000_1100.cff” ’’
…this is a little more interesting to look at!
Change “PythiaSource.maxEvents = 2” to 10 events
Change “drop *” to “keep *” …so we don’t throw away reconstructed objects
Do: GenPythia-QCD_dijets_0_15.cff GenPythia-QCD_dijets_1000_1100.cff
Go in to this new file, and change the PtHat range to
Finally do: cmsRun Example-RecoFromGenPythia.cfg
Go get a cafecito…
The output is called “Example-RecoMET.root” which contains MET objects and CaloTowers.

11. Validation/RecoMET
METTester EDAnalyzer opens output from METProducer and fills ROOT file with histograms containing MET specific quantities.

12. Run the Validation/RecoMET MET Analyzer
Open METTester.cfg
In “PoolSource {”, change fileName:
“untracked vstring fileNames = {‘file:Example-RecoMET.root’}”
…this picks our new input file
Run it: cmsRun METTester.cfg > LOG
The output is: “RecoMET-ValHist.root”

13. Output from METTester
SET ~ 2×ptHat

14. Validation/RecoMET
Contains tools to automatically validate new CMSSW MET, CaloTower, HCAL RecHit, and ECAL RecHit reconstruction software releases
The same EDAnalyzers, along with some simple root scripts, can be used to monitor data and visualize events

15. New tools in Validation/RecoMET
Took some inspiration from CDF and D0 experience to develop new monitoring tools…
From P. Verdier’s CMS MET Workshop talk

16. Tools in Validation/RecoMET
4 new EDAnalyzers:
CaloTowerMETAnalyzer – stores CaloTower specific data to 2-d histograms indexed by (ih,if). Also stores CaloTower geometry (ih,if)  (h,f) and cell sizes.
HCALRecHitAnalyzer – stores HCAL RecHit energy for all 4 layers to 2-d histograms. Also stores CaloTower geometry (ih,if)  (h,f) and cell sizes.
ECALRecHitAnalyzer – stores ECAL RecHit energy to 2-d histograms. Also stores ECAL geometry (ih,if)  (h,f) and (ix, iy)  (x,y) and cell sizes.
DumpEvent – dumps data to log file and stores reconstruction objects for a single event to histograms.
Plot scripts in /test area combine data files and geometry to produce event display plots.
Automated Validation:
now includes ability to compare CaloTower distributions to reference histograms.
Kolmogorov-Smirnov test is used to check compatibility of MET and CaloTower histograms automatically produced for new CMSSW releases to reference histograms. if
(ih,if)  h Map ih
ih  Dh Map

17. Run the Validation/RecoMET HCAL, ECAL, and CaloTower Analyzers
Go to Validation/RecoMET/test
Copy your new Example-RecoMET.root file over from RecoMET/METProducers/test
Open RunAnalyzers.cfg
Under “PoolSource {”, set
“untracked vstring fileNames = {‘file:Example-RecoMET.root’}” …this picks our new input file
# out “path p = { Dumper }” , and un-# “path p = { Dumper, AnalyzeECAL, AnalyzeHCAL, AnalyzeTowers }”
Run it: cmsRun RunAnalyzers.cfg > LOG

18. Make some plots

19. Make Some Plots
Run ROOT script to combine CaloTower Histograms and Geometry to make “physical” plots.
Do: root –b –q .x plotCaloTowers.C

20. Other Examples: Multi-event display
HCAL RecHit Occupancy:
produced using HCALRecHitAnalyzer and plotHCAL.C
CaloTower Occupancy:
produced using CaloTowerMETAnalyzer and plotCaloTowers.C

21. Multi-event display Fun with event displays…
ECAL Crystal Occupancy: Produced using ECALRecHitAnalyzer and plotECAL.C
Fun with event displays…

22. CaloTower Energy Plot (single event display)
ECAL Crystal Energy: Produced using ECALRecHitAnalyzer and plotECAL.C
CaloTower Energy:
produced using CaloTowerMETAnalyzer and plotCaloTowers.C
Superimposed reconstructed objects stored by DumpEvent.C
Jet 1
Jet 2
MET

23. Other Features CaloTowerjet assignment
CrystalSuperCluster assignment

24. Conclusion
Working on Analysis Cluster at UF is relatively painless…thanks support team!
We’re hard at work making useful MET code and validation tools.
User comments and complaints welcome (I think).