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Searching for W′ in 10 TeV pp Collisions: Motivation for a W′

The search for a W′ boson in 10 TeV proton-proton collisions is crucial due to the missing Higgs in the Standard Model. Higgsless models like MHLM predict new bosons, with diboson channels being essential for fermion couplings. Analyzing W′➟WZ events reveals key insights, with the WZjj channel being optimal for initial discovery, while WZZ may become vital with higher luminosities. Background challenges like fake signals from Z+bbar and ttbar highlight the significance of proposed efficiency changes in the L2 Muon Calorimeter Isolation.

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Searching for W′ in 10 TeV pp Collisions: Motivation for a W′

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Presentation Transcript

  1. Search for W′➟WZin 10 TeV pp Collisions

  2. Motivation for a W′ • The SM relies on Higgs to break electroweak symmetry • But the Higgs is still missing • The LHC can investigate Higgsless models • Higgsless Extra-Dimension Models • Technicolor (composite models)

  3. MHLM • The Minimal Higgsless Model (MHLM) is a simple extra-dimensions model which predicts one pair of new W′ and Z′ bosons • To be consistent with electroweak data, couplings to fermions must be small, so diboson channels dominate • W′ ➟ W Z • Z′ ➟ W W • W′ is preferable to Z′ since only one neutrino is produced in the final state

  4. Cross Section of MHLM • Kinematic cuts have been applied; these are all findable events

  5. W′➟WZ • The WZjj channel provides a wide range and larger σ, so is best for initial discovery • The WZZ channel provides a clean resonance peak, so will become more important with larger integrated luminosities

  6. Backgrounds 200 pb-1 • For ZZ, one missing lepton leads to a fake signal • For Z + bbar, ttbar, the b-jets have a much higher likelihood to fake a lepton than do jets from light quarks

  7. Proposed Change toL2 Muon Calorimeter Isolation

  8. Separation of Signals & QCD Cut Region Overall L3 rate reduced by 33% L2 pT Cut Current Iso Threshold (approx.)

  9. Ecal Crystals Cut Region Overall L3 rate reduced by 39% L2 pT Cut Current Iso Threshold (approx.)

  10. Efficiencies at Each Step Proposed:

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