•Probe for new physics
–Non SM production X->tt
–Non SM decay t->Xb
•Resonances in tt production
–Topcolour: qq->V->tt
–Technicolour: qq->hT->tt
–In some models tt condensate explains large top mass/EWSB
•SUSY
–stop: t->t+c0  &   t->b+l+v
–gluino -> stop + top
–
•SUSY Higgs
–t->b + H+  => enhanced t s.
New Physics
Z’
~
Top as Probe
for NP.
Unique role of
heavy quark
Top unique to
Tevatron
Let me make a few comments on New Physics.  If any of the measurements I showed disagree, this could be a sign of new physics.  For example if a new X particle was producing top, you’d see too many events.  If a new X particle was in the decay chain, you’d get different end states.  You might see a resonance as some models predict.  Some models even suggest that tt IS the Higgs.  There is another theory which theorist love called SUSY a summitry between fermions and bosons.  Nobody has any evidence for it, but theorists lug it.  In the simplest version of this theory you get 5 Hags, and the charged one prefers to decay to talus.  If it is around top might decay to it giving more talus in the final state.  Precisely because the number of lepton decays was more or less as expected, limits can be set on a SUSY Higgs in the mass-tanbeta plane.  beta a parameter of SUSY.