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Discovery of a (possible) Higgs Boson at the LHC

Discovery of a (possible) Higgs Boson at the LHC . Amitabh Lath Rutgers, The State University of New Jersey August 7, 2012. Statement by CERN DG on 7/4. Statement by CERN DG on 7/4. What’ he talking about?. Why do we need the Higgs Boson?. Isn ’ t this good enough? .

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Discovery of a (possible) Higgs Boson at the LHC

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  1. Discovery of a (possible) Higgs Boson at the LHC Amitabh Lath Rutgers, The State University of New Jersey August 7, 2012

  2. Statement by CERN DG on 7/4

  3. Statement by CERN DG on 7/4 What’ he talking about?

  4. Why do we need the Higgs Boson? Isn’t this good enough?

  5. Go back 100+ years . . . Isn’t this good enough?

  6. These are high precision Electro-Weak measurements. They give you the top mass. If you already know the top mass, then…

  7. These are high precision Electro-Weak measurements. They give you the top mass. If you already know the top mass, then…

  8. Precision Electro-Weak gives nice “window” on the Higgs Mass.

  9. Higgs Production

  10. Higgs Decay

  11. Higgs hunting strategy

  12. Can we measure Standard Model stuff well?

  13. Can we measure Standard Model stuff well?

  14. Can we measure Standard Model stuff well?

  15. Can we measure Standard Model stuff well?

  16. Can we measure Standard Model stuff well? Standard Model in hand. Let’s proceed to Higgs

  17. H  ZZ  4leptons

  18. gg, ZZ modes most sensitive

  19. What Now? • We do not know what it is at 125-126 GeV/c^2. • It may be THE Higgs Boson, or • It may be A Higgs Boson • We need to measure its couplings to known particles. • It should couple to t, b, W, Z in predictable ways • We need to measure its spin (Higgs has 0 spin). • Note that cosmology needs a scalar (spin 0) field for inflation to work. But that’s another can of worms…

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