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WW Scattering studies for the Future Linear Collider

This study investigates WW scattering in the context of the Electroweak Chiral Lagrangian at e+e- colliders, focusing on the WLWL → WLWL process. By generating events with a 300 GeV/c² Higgs mass and 800 GeV center of mass energy using Pythia 6.2, we analyze the final states with four quarks. Preliminary results highlight challenges in jet pair reconstruction and selection criteria, revealing key areas for further refinement. The work aims to enhance understanding of electroweak symmetry breaking and resonances, pinpointing the need for improved event selection and background analysis.

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WW Scattering studies for the Future Linear Collider

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  1. WW Scattering studies for the Future Linear Collider Andres F. Osorio Postgraduate student High Energy Physics Group

  2. Contents Motivation Work done/ preliminary results Final remarks

  3. Motivation To study WW scattering in the frame of the Electroweak Chiral Langrangian at e+e- colliders • WLWLWLWL • Sensitive to the physics of • Electroweak Symmetry breaking • Look for resonances (scalar, vector, …) • Compare with LHC “WW scattering at LHC”, J. Butterworth, B. Cox, J. Forshaw “Strong Electroweak Symmetry Breaking Signals in WW scattering at TESLA”, R. Chierici, S. Rosati, M. Kobel

  4. First steps • Generating a SM Higgs of mass Mh0 = 300 GeV/c2 • C.M.E. of 800 GeV. • Generating my events with Pythia 6.2 • Look for the 4 quarks final states using a jet finder algorithm • No detector simulation for the moment

  5. Quick review SM Higgs production at e+e- collider: * Higgs-strahlung * WW fusion SM Higgs decays modes

  6. Analysis • Using the KT algorithm (C++ implementation) • -> E recombination scheme. • -> Force to have 4 jets. • It is clear that this should work but I’m having problems when I form pairs of jets and reconstruct the signal. • ->This isn’t working, so I had to perform a subjet analysis (using ycut set to 0.0005).

  7. Signal • Selection: • Take all possible pairs of combinations of jets. • Using the criteria • |Mij-MW|*|Mkl-MW| • take the minimum. L = 500 fb-1

  8. Background L = 500 fb-1

  9. Final remarks • It’s not yet well understood why the problem in having only 4 jets: • - Is it a problem with the generated events? • - Is it a “bug” in the K++? • Lots of things to do: • - Refine the selection method and apply cuts • - Work fully on the background signals (QCD?) • - Study the angular distribution Cos (*)

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