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New Physics at a TeV and the LHC – II & III

New Physics at a TeV and the LHC – II & III. Sreerup Raychaudhuri Tata Institute of Fundamental Research, Mumbai, India . Higgs and New Physics Searches at the LHC. IPM String School (ISS 2009), Tehran, Iran April 17, 2009. Significance of the TeV energy scale:. top-down approach :

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New Physics at a TeV and the LHC – II & III

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  1. New Physics at a TeV and the LHC – II & III SreerupRaychaudhuri Tata Institute of Fundamental Research, Mumbai, India Higgs and New Physics Searches at the LHC IPM String School (ISS 2009), Tehran, Iran April 17, 2009

  2. Significance of the TeV energy scale: • top-down approach : • GUT or stringy unification must have low energy consequences; high scale SUSY will have low energy manifestations, extra dimensions will become accessible at high enough energies • bottom-up approach : • hierarchy problem, neutrino masses, GUT evolution • aesthetic approach : • 18 free parameters in the SM • no QCD-EW unification • desert scenarios

  3. Capabilities of the LHC Cannot do a blind search… All important final states require a trigger

  4. Huge QCD backgrounds… especially if looking for hadronic final states • Cannot see very soft pT jets/leptons/photons LHC has severe limitations….

  5. Sure shots : Can determine t quark properties to precision Can find the Higgs boson of the SM (if it exists) Can find a SUSY signal if kinematics permits Can find a resonant new state Less sure : Can measure Higgs boson couplings Can measure SUSY parameters Can discover exotics, e.g. gravitons, monopoles…

  6. How are we so sure?

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  16. 11 RG evolution of mSUGRA spectrum

  17. 12 Present status of MSSM parameter space

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