that EDM’s constrain ${\rm Im}[\eta_U^\star \, \eta_D^\star]$ while $B \rightarrow X_s \, \gamma$ constrains ${\rm Re}[\eta_U^\star \, \eta_D^\star]$.

### Collider Physics: Two Scalar Doublet Model

Pairs of $S$ particles can be produced through the tree level exchange of vector bosons produced through $q \, \bar{q}$ initial states in the case of the Tevatron and LHC and $e^+ \, e^-$ in the case of LEPII.

From LEPII a bound on the mass scale of the new scalar doublet is obtained as no anomalous two and four jet events were seen when operating at $\sqrt{s} = 209 \, {\rm GeV}$ where $0.1 \, fb^{-1}$ of integrated luminosity was collected. The relevant cross sections in this case are given in [@Burgess:2009wm] and the masses are bound to be m\_[S\^]{} 105 [GeV]{}, m\_[S\_R\^0]{} + m\_[S\_I\^0]{} 209 [GeV]{}. We plot the allowed $m_S,\lambda_3$ that satisfy this second bound for the minimal two scalar doublet model in Fig.3. We have also performed an electroweak precision data fit. For scalar masses $\sim 100 \,{\rm GeV}$ the constraints are weak. The allowed mass splitting in this model is $|m_I - m_\pm| \lesssim 200 \, {\rm GeV}$ using the $95 \% {\rm CL}$ region.

A light mass of $S^0_I$ 