By exploiting relations between gravity and gauge theories, we present two in nite sequences of one-loop n-graviton scattering amplitudes: the `maximally helicity-violating' amplitudes in N = 8â€¦ (More)

We compute the leading corrections to the properties of W and Z bosons induced at the one-loop level in the SU(5)/SO(5) Littlest Higgs model with T parity, and perform a global fit to precisionâ€¦ (More)

Recently there has been a lot of interest in models in which gravity becomes strong at the TeV scale. The observed weakness of gravitational interactions is then explained by the existence of extraâ€¦ (More)

Null results of experimental searches for the Higgs boson and the superpartners imply a certain amount of fine-tuning in the electroweak sector of the Minimal Supersymmetric Standard Model (MSSM).â€¦ (More)

This article reviews the Little Higgs models of electroweak symmetry breaking and their phenomenology. Little Higgs models incorporate a light composite Higgs boson and remain perturbative until aâ€¦ (More)

Little Higgsâ€™ models, in which the Higgs particle arises as a pseudoGoldstone boson, have a natural mechanism of electroweak symmetry breaking associated with the large value of the top quark Yukawaâ€¦ (More)

The introduction of T parity dramatically improves the consistency of Little Higgs models with precision electroweak data, and renders the lightest T-odd particle (LTP) stable. In the Littlest Higgsâ€¦ (More)

We identify and study the signatures of the recently proposed Higgsless models at the CERN Large Hadron Collider (LHC). We concentrate on tests of the mechanism of partial unitarity restoration inâ€¦ (More)

In supersymmetric models, scalar top quarks, or stops, generically have parity-violating couplings to top quarks. As a result, tops produced in stop decays should be polarized. In this paper, we willâ€¦ (More)

We present an ansatz for all one-loop amplitudes in pure Einstein gravity for which the n external gravitons have the same outgoing helicity. These loop amplitudes, which are rational functions ofâ€¦ (More)