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Strong Electroweak Symmetry Breaking

This study investigates the electroweak symmetry breaking through the lens of weak boson scattering processes and their sensitivity to quartic anomalous couplings. Utilizing a comprehensive simulation analysis at the LHC and ILC, we evaluate initial state radiation effects, signal processes, and combinations of electron-positron interactions at 1 TeV. We outline sensitivity evaluations with likelihood fits and confidence level contours for various parameters. Our results lay the groundwork for interpreting observations from future collider experiments and advancing theoretical understanding.

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Strong Electroweak Symmetry Breaking

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  1. Strong Electroweak Symmetry Breaking P.Krstonosic Work done by : K. Mönig, W.Killian, P.Krstonosic, M. Beyer, E. Schmidt, H. Schröder LHC / ILC interplay

  2. Introduction • All possible weak boson scattering processes and sensitivity to the quartic anomalous couplings • deff. remark LHC / ILC interplay

  3. Processes • Polarization 80%L for e- , 40%R for e+ for the beams • Initial state radiation taken into account • single weak boson production as background • e- e- option considered new LHC / ILC interplay

  4. Sensitive variables • dependence of the total cross section on anomalous couplings • ( only one varied at a time) , and sensitivity of variables used in the • fit ( total mass , absolute production and decay angle ) LHC / ILC interplay

  5. Simulation & Fit • Full 1ab-1 event sample generated with WHIZARD • Hadronization with PYTHIA followed by SIMDET fast simulation • Matrix element calculation with O'mega used for calculating event weights in the form : where R is the ratio of the matrix element to the SM one • Sensitivity is evaluated with Binned Likelihood Fit SM sample, • After separate analysis for signal processes double counted events were assigned to one sample according to mass distance from M(V)+M(V) mass (V=W or Z) LHC / ILC interplay

  6. ISR • example of ISR influence on result • ( 800GeV W+W- ) Fit for only signal process ( no background) LHC / ILC interplay

  7. 1TeV e+e- • two parameter contours • ( full line 70%Cl, dotted line 90%Cl) LHC / ILC interplay

  8. 1TeV e+e- • Results from 1ab-1 sample • 2D case ( ) • and a full 5D fit LHC / ILC interplay

  9. 1TeV e+ e- • result for a 1ab-1 sample from e+e- processes at 1TeV LHC / ILC interplay

  10. 1TeV e-e- and combined • in red 1ab-1 e+e- & 350fb-1 e- e- • in blue 2ab-1 e+e- LHC / ILC interplay

  11. Triple weak boson production standard model background LHC / ILC interplay

  12. Three-body kinematics • momenta • 3 particles x 4 components 12 • energy momentum conservation - 4 • on-shell condition - 3 • axial invariance (-dependence) - 2 • e.g. eZ plane, ZW plane • total 3 • kinematical variables: M(ww), M(wz),θ(Z) • spins, 2 d.o.f LHC / ILC interplay

  13. Confidence level contours 5 WWZ 80% e-right polarization WWZ unpolarized 70%Cl 90%Cl 4 WWZ 80% e-right, 60% e+left ZZZ unpolarized preliminary LHC / ILC interplay

  14. LHC / ILC interplay

  15. LHC / ILC interplay

  16. LHC / ILC interplay

  17. LHC / ILC interplay

  18. LHC / ILC interplay

  19. assumptions assumptions Contour Number Number Contour X Current status LHC ILC Analysis Analysis Result Combine Result LHC / ILC interplay

  20. ILC Examples LC-PHSM-2001-038 • Limited use .. Just to make a nice plot ( increase authors citation • index ) .. No use for another study LHC / ILC interplay

  21. assumptions What we want LHC ILC Analysis Analysis Result LHC / ILC interplay

  22. Summary • Major step towards a full and consistent set of limits done • Triple weak boson production still to come • Interpretation of results in specific physic scenarios in plan • waiting for results of LHC analysis LHC / ILC interplay

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