2. Higgs Sector Profile at ILC
T Barklow, hep-ph/

3. The Higgs Profile and the Physics beyond
In models with new particles
mixing with the Higgs boson,
branching fractions are modified,
generally through the introduction
of an additional (invisible) decay
width;
J Hewett, T Rizzo
Models of extra dimensions
stabilised by the Radion are
characterised by potentially
large changes to Higgs decay
Branching fractions:
Higgs/Radion mixing

4. Determining the Higgs Potential
Fundamental test of Higgs
potential shape through independent
Determination of gHHH in double
Higgs production
Opportunity unique to the ILC,
LHC cannot access double H
Production and SLHC may have
only marginal accuracy;

5. Double Higgstrahlung at 0.5 TeV
Double WW Fusion at 1 TeV
HH Mass
Decay Angle

6. Reanalysis of HHZ production with realistic simulation of
SiD detector and full backgronds;
Emphasis of Particle Flow
performance and algorithm
optimisation;
Barklow, LCWS07

7. PFA for Higgs Physics
qqHH

8. Barklow, LCWS07

9. Indirect Signals of New Physics in the Higgs Sector
Desch et al., hep-ph/

10. The Higgs Profile and the Physics beyond
In models with extended Higgs sector, such as SUSY, Higgs
couplings get shifted w.r.t. SM predictions:
Desch et al.,
hep-ph/

11. The Effect of
Theory Uncertainties
Droll, Logan,
PRD76 (2007)

12. MSSM Higgs Sector with CP violation Resonant CP-violation
phenomena in Higgs sector
to be investigated at ILC
using Higgstrahlung
process;
Ellis, Lee, Pilaftsis., PRD72 (2005)

13. Invisible Higgs Decays
In ADD model mixing of Higgs and KK graviscalar and H decay in
graviscalar pairs generate invisible width which can be detected at ILC;
Study of invisible H decay and at ILC allows to tightly
constrain model parameters:
LHC
ILC
MB, Dominici, Gunion, Wells, LCWS05

14. Invisible Higgs Decays
Radion mixing in RS models
shifts Higgs couplings;
Possible reduction of Higgs
yields at LHC but clear
signature in ILC data from
precision data on bb and WW
couplings:
MB, De Curtis, Dominici et al., PLB568 (2003)

15. Heavy Higgses in the MSSM

16. Heavy Higgs Sector
in MSSM
ACFA Study
hep-ph

17. Indirect and Direct Limits on H+
LEP-2
B Factories

18. Exclusion regions for discovery of
Dark Matter Direct Searches
and SUSY Higgs at the Tevatron
Exclusion regions for discovery of
at Tevatron (2 x 4 fb-1)
Negative Direct DM results reduce
likelihood of heavy SUSY Higgs
discovery at Tevatron, while
Direct DM signal would make
Tevatron discovery likely.
Carena, Hooper, Skands, hep-ph/

19. Constraining the Higgs Sector with WCDM
Allanach et al.,hep-ph/

20. Heavy Higgs Sector in MSSM DM (GeV) DG (GeV) 0.24 1.5
Desch et al., hep-ph/

21. Heavy Higgs Sector in MSSM Scenarios at large tan b, such as LCC3
and LCC4 and EGRET compatible
region have large sensitivity on tan b;
e+e- "H+H- "tbtn sensitive to tan b
process produced with typical cross
section of ~ 2 fb at 1 TeV giving BRs
accuracy of O(3-6%).

22. Heavy MSSM Higgses , Wch2 and LCC4

23. The Higgs Sector of the LCC4 Point
LCC4 point in A0 Funnel region
Benchmark point defined in cMSSM
LCC4 Benchmark

24. Selection Criteria 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 %
Ncha > 20
Ntot > 100
Echa > 250 GeV
Etot > 850 GeV
ET > 350 GeV
y34 <
Thrust < 0.96
Mjj > 150 GeV

25. b-Tagging and Particle Flow
Di-jet b-tagging for CMOS VTX02
Particle Flow for LDC01Sc Model
[Cluster cheater to achieve ]
eb = 0.85
eudsc = 0.02

26. Selection Criteria
Etot

27. 4-jet Kinematic Fit
Perform constrained kinematic fit to 4-jet system, which uses Lagrange
multipliers and minimises a c2 constructed from the measured energies
and directions of the jets;
Impose centre-of-mass energy and
momentum conservation;
Consider jj jj pairing giving smallest
mass difference and plot di-jet
masses Mjj (2 entries / evt);
Port of PUFITC+ developed for
DELPHI at LEP2 (N Kjaer, M Mulders)
to MarlinReco framework
MB, Hooberman

28. Preliminary DiJet Mass Fit
Optimise resolution with
|Mjj1 – Mjj2| < 25 GeV
Total Efficiency 23%
Fit with Crystal Ball
Function and extract
Mass and Width:
(Preliminary)

29. Detector Parametric Simulation SIMDET
Comparison with
Detector Parametric Simulation SIMDET
SIMDET

30. Further DM Constraints from HA
BR(A gbb)
Analysis of Markov Chain
MSSM scans to identify
further observables to
possibly improve DM
density determination at
the ILC

31. t t A0 Branching Fraction Determination b b b b b b
Contrast bbtt to bbbb based on missing energy,
nb. of hadronic jets and jj+recoil masses;
bbtt Reconstruction Efficiency 35% b b b
Determine BR(Agtt) from rate of bbtt to bbbb
tags, WW + ZZ background appears small; b
Expect ~ 0.15
~0.07 t t b

32. Stau Tri-linear Coupling - Atau
Constrain Atau through
H g tt decays:
Stau Couplings to H/A: ~~
Atau A H
In A funnel, MA<Mt1+Mt2
and the only such decay
allowed by CP for the
pseudoscalar Agt1t2 is
not available;
Heavy H0 gt1t1 scales with Atau and can be used to constrain
stau trilinear coupling in this regime.

33. Stau Tri-linear Coupling - Atau
H/A Branching Ratios vs Atau
Atau scan for LCC4
MSSM parameters
with HDECAY 2.0
Large Hgt1t1 can
be detected by standard
bbtt + bbbb analysis
and used to constrain
Stau trilinear coupling

34. for LCC4 with HA analysis
DM density accuracy
for LCC4 with HA analysis
Phys.Rev.D74:103521,2006.
MB, Hooberman, Kelley