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2 years ago

Physics of Dark matter and Universe in the LHC era

DSU_nojiri

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Looking back LEP era EW precision • No deviation of standard model. Field Theory wins • Technicolor becomes very difficult to realize • People have left to effective theory: Little Higgs model or composite model wheeven Higgs boson is NG boson of some global symmetry without specifying the origin of symmetry breaking • Important Lessons have been learned in this approach • top sector need to be enlarged → top partner • Z2 symmetry separating new sector from SM sector → TeV scale new physics (stable spin 1 particle as dark matter)

LEP gauge coupling unification and supersymmetry We thought( in early 90’s) 1TeV SUSY + 10^16 GeV coupling Unification (GUT) is promising. Connection to String theory It is later realized that squark scalar masses can be heavy keeping coupling unification unchanged (split SUSY) Lightest supersymmetric particle(LSP) as Dark matter; Spin 1/2 gauge singlet(Bino) , doublet(Higgsino), and Adjoint(Wino)

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