1. Daniel Blackburn University of Washington
Higgsphyllic Z’ Model
Daniel Blackburn
University of Washington

2. Outline A. Martin & T. Roy’s higgsphyllic Z’ model MC simulation
HV trigger efficiencies of MC events

3. Z’ Branching Fractions:
Higgsphyllic Z’ Model
Z’ Branching Fractions:
d / s / b: 6% each
u / c: 20% each
e / μ / τ: 13% each
νe / νμ / ντ: 0.2% each
Z’ is a vector boson, less massive than Z
Light Higgs with mass near 120 GeV produced by gluon fusion
For well-separated and hard final state fermions, Z’ mass may be in range 0.5 mh > mZ’ > 0.1 mh.
Z’ decays to kinematically allowed fermion pairs.
Reference: A. Martin, T. S. Roy. The Gold-Plated Channel for Supersymmetric Higgs via Higgsphilic Z’. arXiv: v1, Submitted to Physical Review
Z’ is the gauge boson of the broken U(1) symmetry
Gluon Fusion dominant in GeV. So we consider Higgs in this mass range. Add Z’ mass to this slide. Move Z’ lifetime is a free parameter to this slide.
Make feynman diagram be f-fbar instead of lq lbarqbar

4. Characteristics of Model
Z’ couples strongly to Higgs. Z’ may receive a significant portion of Higgs decay branching fraction
While (mZ)2 >> (mZ’)2, Z’ decay branching fraction is approximately independent of Z’ mass
The Z’ may decay promptly or be long-lived. The Z’ branching fraction is not affected by changing Z’ lifetime
Since each Z’ may decay giving electrons, muons, or jets, there are a variety of final state signatures

5. MC Simulation
Approximately 30,000 events privately simulated with no pileup (MC generation details in backup slides)
mh = 120 GeV, mZ’ = 50 GeV
Z’ lifetime (arbitrarily) set to cτ = 12 m. Lifetime chosen to explore sensitivity throughout detector.
Decay Product
Predicted Decays
MC Data d
3823
3763 u
12060
12059 s
3830
3811 c
12009 b
3670
3644 e
8405
8421 νe
149
153 μ
8406
8430 νμ
134 τ
8358
8419 ντ
151
133

6. Detector Signatures
Efficiency is found as a function of Z’ decay position. For each bin of width dR, the efficiency is the ratio of total triggered Z’ events to total Z’ decay events in that dR bin. (ε = triggered events / total events)
The Z’ efficiencies can be compared to our πv0 in ATL-PHYS-PUB

7. Muon Cluster Trigger Efficiency
Barrel: Hadronic ends at r = 4.25m. First muon trigger plane at 7000 mm
Endcap: Hadronic ends at z = 6.5 m. Muon triggering plane at z = 14m.
Barrel Region: |η| < 1
Endcap Region: |η| > 1

8. Muon Cluster Trigger Efficiency
Barrel Region: |η| < 1
Endcap Region: |η| > 1

9. Muon Cluster Trigger Efficiency
Barrel Region: |η| < 1
Endcap Region: |η| > 1

10. Cal Ratio Trigger Efficiency
EM Calorimeter barrel ends at r = 2 meters. As expected, the barrel signal begins at 2 m.
In the 082 publication, Cal Ratio turns on at Z = 4m. This is also what we see here.
Barrel Region: |η| < 1.4
Endcap Region: |η| > 1.4

11. Cal Ratio Trigger Efficiency
Barrel Region: |η| < 1.4
Endcap Region: |η| > 1.4

12. Cal Ratio Trigger Efficiency
Barrel Region: |η| < 1.4
Endcap Region: |η| > 1.4

13. Conclusions
Fair trigger efficiency for most Z’ decays throughout the detector.
Z’ to b decays have efficiency comparable to πv0 in note 082.
Z’ muon decays currently evade HV triggers. These signals should be selected with 3mu6_MSonly and 2mu6_MSonly_g10_loose triggers.
3mu6_MSonly
2mu6_MSonly_g10_loose
Future work:
Add pileup and study how event selection changes.
Simulate the SUSY signal from Martin and Roy’s model, with Z’ being produced in association with the LSP (manifesting MET)

14. Backup Slides

15. Athena Generation
Evgen with Athena : Evgen_trf.py ecmEnergy=7000 runNumber= firstEvent=1 maxEvents=5000 randomSeed= jobConfig=MC PythiaLLP_ggH120_Zprime50.py outputEvgenFile=pythia.pool.1.root
Simulation with Athena : pathena --trf "csc_atlasG4_trf.py --mcinput=True inputEvgenFile=%IN outputHitsFile=%OUT.HITS.pool.root \ maxEvents=50 skipEvents=%SKIPEVENTS randomSeed=%RNDM: geometryVersion=ATLAS-GEO physicsList=QGSP_BERT \ conditionsTag=OFLCOND-SDR-BS7T-02 DBRelease=%DB:ddo Atlas.Ideal.DBRelease.v120201:DBRelease tar.gz \ IgnoreConfigError=False" --outDS user.Daniel.mc pythia.simul.HITS.42/ \ --inDS user.Daniel.pythia.evgen nEventsPerJob 50
Reconstruction with Athena : pathena --trf \ 'Digi_trf.py \ inputHitsFile=%IN \ outputRDOFile=TMP.RDO.root \ maxEvents=25 \ skipEvents=%SKIPEVENTS \ DBRelease=%DB:ddo Atlas.Ideal.DBRelease.v150301:DBRelease tar.gz \ conditionsTag=OFLCOND-SDR-BS7T \ geometryVersion=ATLAS-GEO \ digiSeedOffset1=1 \ digiSeedOffset2=0; \ \ Reco_trf.py \ inputRDOFile=TMP.RDO.root \ outputESDFile=%OUT.ESD.pool.root \ outputAODFile=%OUT.AOD.pool.root \ DBRelease=%DB:ddo Atlas.Ideal.DBRelease.v150301:DBRelease tar.gz \ autoConfiguration=everything \ conditionsTag=OFLCOND-SDR-BS7T \ geometryVersion=ATLAS-GEO \ preExec="TriggerFlags.AODEDMSet=%8BAODSLIM%8B%3Brec.Commissioning.set_Value_and_Lock(True)%3Bjobproperties.Bea m.energy.set_Value_and_Lock(3500*Units.GeV)%3BmuonRecFlags.writeSDOs=True%3Bfrom\ %0BCaloRec.CaloCellFlags%0Bimport%0Bjobproperties%3Bjobproperties.CaloCellFlags.doMinBiasAverage=False%3Bjobproperties. Beam.numberOfCollisions.set_Value_and_Lock\ (8.0)%3Bjobproperties.Beam.bunchSpacing.set_Value_and_Lock(50)%3Bfrom%0BCaloTools.CaloNoiseFlags%0Bimport%0Bjobproper ties%3Bjobproperties.CaloNoiseFlags.FixedLuminosity.set_Value_and_Lock\ (1.45)%3BAODFlags.TrackParticleSlimmer=True%3Bfrom%0BCaloRec.CaloTopoClusterFlags%0Bimport%0Bjobproperties%3Bjobpr operties.CaloTopoClusterFlags.doCalibHitMoments.set_Value_and_Lock(False)" \ preInclude=SimulationJobOptions/preInclude.PileUpBunchTrains2011Config6_DigitConfig.py RunDependentSimData/configLumi_FutureProfile.py \ postInclude_r2e=RecJobTransforms/IDTrackingPtMin400MeV.py \ triggerConfig=MCRECO:MC_pp_v2_tight_mc_prescale\ ndminbiashitsfile=mc10_7TeV pythia_minbias_inelastic.merge.HITS.e723_s932_s952 \ numberofndminbias=8.0' \ --long \ -- dbRelease \ ddo Atlas.Ideal.DBRelease.v150301:DBRelease tar.gz \ --nEventsPerJob 50 \ --inDS \ user.Daniel.mc pythia.simul.HITS.42/ \ --outDS \ user.Daniel.MC Pythia_MadGraph.ESDAOD.45

16. Coupling Constants
(Here, q refers to any quark including b, while l refers only to electrons or muons...)

17. SUSY event Signals of 4l + MET.
S-twiddle a dirac singlino, candidate for LSP. N-twiddle a neutral higgsino

18. 082: Muon Cluster
Cal Ratio