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Littlest Higgs Model and Unitarity Constraints Namit Mahajan

The Littlest Higgs Model is constrained using the tree-level perturbative arguments, similar to those used to obtain the Higgs mass bound. It is found that demanding that the theory respects perturbative unitarity upto scales of the order of TeV, in turn implies that the scale f , the analog of pion decay constant, is around 4 TeV.