contributions from t baltz, a djouadi. the higgs sector of the lcc4 point lcc4 benchmark lcc4 point...
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Contributions from T Baltz, A Djouadi
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The Higgs Sector of the LCC4 Point
LCC4 Benchmark
LCC4 point in A0 Funnel regionBenchmark point defined in cMSSM
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h2 and SUSY Parameters at LCC4
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LCC4 at ILC at 0.5 and 1 TeV
Determine M(1) and M(1) - M(10)
from stau threshold scan and decaysat 0.5 TeV;
Estimate A0) from precise BR(h0 bb) at 0.35/0.5 TeV;
LCC4 studied in details using SIMDET parametric simulation;Results presented at LCWS04, ALCPG Victoria and ILC-Cosmo study hep-ph/0410123
Precisely determine M(A0), (A0) in HA production at 1 TeV.
Determine from M(3)-M(1) at 1 TeV
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H0A0 Analysis with Full G4 + Marlin Reconstruction
• Generate events with PYTHIA 6.58 + ISASUGRA 7.69• Full G4 Simulation with Mokka 6.01 for LDC01Sc• Reconstruction using Marlin + MarlinReco 00.09.06
• 1050 HA signal events simulated and analysed;• Currently processing ZZ + WW + tt (PYTHIA generation) and bbbb (EW + QCD) (COMPHEP+PYTHIA);
Plan to study result vs. Vertex Tracker geometry and performance.
Results of SIMDET study at the basis of comprehensive study of ILC reach in predicting DM density (Phys.Rev.D74:103521,2006).Now repeat analysis with full simulation and attempt to improve resultwith new observables available at ILC
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Reconstruction
Particle Flow for LDC01Sc Model
[Cluster cheater to achieve ]E
30.0
Di-jet b-tagging for CMOS VTX02
b = 0.85udsc = 0.02
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Selection Criteria
Ncha > 20
Ntot > 100
Echa > 250 GeV
Etot > 850 GeV
ET > 350 GeV
y34 < 0.0025
Thrust < 0.96
Mjj > 150 GeV
• General selection cuts:
• at least 4 hadronic jets (JADE algorithm) (at least 5 ptc/jet);
• force event to 4 jets;
• apply di-jet btagging;
• reconstruction Efficiency = 40 %
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Selection Criteria
Etot
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4-jet Kinematic Fit
Port of PUFITC+ developed for DELPHI at LEP2 (N Kjaer, M Mulders)to MarlinReco framework
Perform constrained kinematic fit to 4-jet system, which uses Lagrange multipliers and minimises a 2 constructed from the measured energies and directions of the jets;
Impose centre-of-mass energy andmomentum conservation;Consider jj jj pairing giving smallestmass difference and plot di-jetmasses Mjj (2 entries / evt);
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Preliminary DiJet Mass Fit
Optimise resolution with|Mjj1 – Mjj2| < 25 GeV
Total Efficiency 23%
Fit with Crystal Ball Function and extract Mass and Width:
0.9)GeV(17
GeV)9.0419(M
(Preliminary)
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Comparison with SIMDET
SIMDET
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Further DM Constraints from HA
BR(A bb)
Analysis of Markov Chain MSSM scans to identifyfurther observables to possibly improve DM density determination atthe ILC
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A0 Branching Fraction Determination
bb
b b
b
b
Contrast bbto bbbb based on missing energy,nb. of hadronic jets and jj+recoil masses;
bb Reconstruction Efficiency 35%
Determine BR(A) from rate of bb to bbbbtags, WW + ZZ background appears small;
Expect ~ 0.15
~0.07
)BR(A
)BR(A
)BR(A
)BR(A
bb
bb
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Stau Tri-linear Coupling - Atau
Atau
Constrain Atau through
H decays:Stau Couplings to H/A:
A
H
tanA tau
~~
cos
sin
cos
cosA tau
In A funnel, MA<M1+M2
and the only such decay allowed by CP for the pseudoscalar A is not available;Heavy H0 scales with Atau and can be used to constrain stau trilinear coupling in this regime.
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Stau Tri-linear Coupling - Atau
H/A Branching Ratios vs Atau
Atau scan for LCC4 MSSM parameterswith HDECAY 2.0
Large H can be detected by standardbb + bbbb analysisand used to constrainStau trilinear coupling
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DM density accuracy for LCC4 with HA analysis
Phys.Rev.D74:103521,2006.
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Conclusion
• Re-analysis of HA channel for LCC4 at 1 TeV using full simulation and MarlinReco started;
• Ported DELPHI kinematic fit PUFITC+;
• Developing b-tagging package based on CMOS VTX Tracker;
• First results on efficiency and mass accuracy comparable to those obtained with SIMDET;
• study of HA decays allows to promote the relative accuracy on h2 from 0.16 to 0.08 thus matching the accuracy of the first WMAP determination;