1. Strong Electroweak Symmetry Breaking from
K. Mönig , P. Krstonosic
DESY - Zeuthen

2. Introduction
In absence of light Higgs interaction among gauge bosons becomes strong at high energy
Effective Lagrangian contains five CP conserving operators that can be directly probed in weak boson scattering
Couplings are related to the scale of “new” physics by ,
and it’s necessary to do the multidimensional analysis in order to obtain the information on scale and dynamics of EWSB sector

3. Towards the complete and combined set of limits
All possible weak boson scattering processes and sensitivity to the quartic anomalous couplings

4. e- e- SQRT(s)=800GeV polarization ( LL 80% ) and ISR
Whizard event generator , hadronic final states
signal process
* **

5. W- W- analysis fragmentation with Pythia
Simdet fast detector simulation
Event selection :
electron rejection within tracker E(e)>100GeV rej. E(e) < 100GeV cone rej.
if E of energy flow > 75GeV and
if E of energy flow > 100GeV and
ask for min. 8 tracks , force to 4 jets , pair
apply cuts : 2 tracks per jet , transverse momentum >35GeV
150< transverse energy <600GeV, recoil mass > 200GeV
anti b tag ( rejection if Pt corrected vertex mass in a jet above 2.1GeV )

6. W- W- analysis Number of accepted events from a 1000 fb-1 sample
Good separation of the signal and background
lower Pt cut possible – to increase the sensitivity

7. W- W- analysis
Signal (in blue) and background (in red) distributions over production and decay angle and total mass of the event ( signal on top of the background )

8. e+ e- SQRT(s)=800GeV polarization ( RL 40% 80% ) and ISR
Whizard event generator , hadronic final states *

9. W+ W- analysis fragmentation with Pythia
Simdet fast detector simulation
Event selection :
electron rejection within tracker E(e)>100GeV rej. E(e) < 100GeV cone rej.
if E of energy flow > 75GeV and
if E of energy flow > 100GeV and
ask for min. 8 tracks , force to 4 jets , pair
apply cuts : 2 tracks per jet , transverse momentum >40GeV
150< transverse energy <600GeV, recoil mass > 200GeV
anti b tag ( rejection if Pt corrected vertex mass in a jet above 2.1GeV )

10. Z Z analysis fragmentation with Pythia Simdet fast detector simulation
Event selection :
electron rejection within tracker E(e)>100GeV rej. E(e) < 100GeV cone rej.
if E of energy flow > 75GeV and
if E of energy flow > 100GeV and
ask for min. 8 tracks , force to 4 jets , pair
apply cuts : 2 tracks per jet , transverse momentum >20GeV,
200< missing energy <600GeV, transverse energy >140GeV
reject E(μ)>20GeV , |cos(Θmiss)|<0.99 (8.1o)

11. Number of accepted events from a 1000 fb-1 sample
W+ W- in black , ZZ in bracket in red

12. Fit Binned Maximum Likelihood fit to the expected distributions for a
SM sample (all quartic couplings equal zero)
Coefficients obtained by recalculating matrix elements in 5 points in α4 α5 space for each event and solving system of equations:
R is the ratio of the matrix element to the SM one.
After separate analysis for signal processes double counted events were assigned to one or another sample according to the distance form M(V)+M(V) mass (V=W or Z)

13. Fit distributions Signal in blue background in red (example from W+W-)
Events binned over absolute production angle, absolute decay angle and total event mass
cross section information in form of the likelihood normalization

14. W- W- result 350 fb-1 sample Confidence level contour full line 68% CL
dotted 90% CL

15. W+ W- result In red present Confidence level contours
analysis in black
* Strong Electroweak Symmetry Breaking Signals in WW Scattering at TESLA Roberto Chierici, Stefano Rosati and Michael Kobel LC-PHSM
Confidence level contours
Full line 68% CL
dotted 90% CL

16. Z Z result set to zero Confidence level contours In red present
Full line 68% CL
dotted 90% CL
In red present
analysis in black
* Strong Electroweak Symmetry Breaking Signals in WW Scattering at TESLA Roberto Chierici, Stefano Rosati and Michael Kobel
LC-PHSM
set to zero

17. Combined fit
model independent limit on fb-1 e+e- sample with 350fb-1 e-e- sample
combined
Confidence level contours, full line 68%CL dotted 90%

18. Only e+e- processes ( assuming equal zero i. e
Only e+e- processes ( assuming equal zero i.e. SU(2)C conserving case )
combined
combined from *
Confidence level contours,
full line 68%CL dotted 90%

19. e+e- & e-e- processes combined
In red analysis results, in black combined fit for W+W- and ZZ only from *
set to zero
Confidence level contours,
full line 68%CL dotted 90%

20. 4D fit e+e- & e-e- processes combined, free parameters of the fit
two parameter confidence level contours
Confidence level contours, full line 68%CL dotted 90%

21. (assuming 1:3 luminosity)
Does e- e- help?
Results of combined fit for:
in red 1ab-1 e+e- and 350fb-1 e-e-
in blue 2ab-1 e+e-
(assuming 1:3 luminosity)
set to zero

22. (assuming 1:3 luminosity)
fit result without process
Results of combined fit for:
in red 1ab-1 e+e- and 350fb-1 e-e-
in blue 2ab-1 e+e-
(assuming 1:3 luminosity)
Only 90%CL
contour plotted

23. Red 1σ limit (so far ) for LC
LC and LHC
Red 1σ limit (so far ) for LC
GRAY 1 sigma limit for LHC integrated luminosity of 100fb-1, assumed that all SU(2)C violating couplings vanish.
( from Strongly interacting vector bosons at the CERN LHC: Quartic anomalous couplings, A.S. Belyaev, O.J.P. Eboli, M.C. Gonzalez-Garcia, J.K. Mizukoshi, S.F. Novaes and I. Zacharov, Phys. Rev. D59,
p )
Is something coming ?

24. Future improvement in Z Z analysis still possible
results in easy to use and combine form
W Z analysis in progress
combined limits on full parameter set at 800GeV to be obtained soon
going for 1TeV