Constraining wrong-sign hbb couplings with h→ϒγ

Living with the Wrong Sign

We describe a UV complete asymptotically fragile Lorentz-invariant theory exhibiting superluminal signal propagation. Its low energy effective action contains “wrong” sign higher dimensional operators. Nevertheless, the theory gives rise to an S-matrix, which is defined at all energies. As expected for a non-local theory, the corresponding scattering amplitudes are not exponentially bounded on ...

Probing wrong-sign Yukawa couplings at the LHC and a future linear collider

We consider the two-Higgs-doublet model as a framework in which to evaluate the viability of scenarios in which the sign of the coupling of the observed Higgs boson to down-type fermions (in particular, b-quark pairs) is opposite to that of the Standard Model (SM), while at the same time all other tree-level couplings are close to the SM values. We show that, whereas such a scenario is consiste...

Constraining Anomalous Top Quark Couplings at the Tevatron

We explore the influence of an anomalous chromomagnetic moment, κ, on the production characteristics of top quark pairs at the Tevatron. We find that for top quarks in the 170 GeV mass range, present searches are probing values of κ of order 13 . For κ’s in this range we find that significant enhancements in the both the qq̄, gg → tt̄ production cross sections are obtained. Once top has been veri...

Constraining the Couplings of a Charged Higgs to Heavy Quarks

Hard supersymmetry-breaking ‘‘wrong-Higgs’’ couplings of the MSSM

In the minimal supersymmetric extension of the standard model (MSSM), if the two-Higgs doublets are lighter than some subset of the superpartners of the standard model particles, then it is possible to integrate out the heavy states to obtain an effective broken-supersymmetric low-energy Lagrangian. This Lagrangian can contain dimension-four gauge-invariant Higgs interactions that violate super...