Low-energy phenomenology of trinification: An effective left-right-symmetric model

The trinification model is an interesting extension of the Standard Model (SM) based on the gauge group $SU(3{)}_C\times SU(3{)}_L\times SU(3{)}_R$. We study its low-energy phenomenology by constructing a low-energy effective field theory, thereby reducing the number of particles and free parameters that need to be studied. The resulting model predicts that several new scalar particles have masses in the $\mathcal{O}(100\mathrm{GeV})$ range. We study a few of the interesting phenomenological scenarios, such as the presence of a light fermiophobic scalar in addition to a SM-like Higgs, or a degenerate (twin) Higgs state at 126 GeV. We point out regions of the parameter space that lead to measurable deviations from SM predictions of the Higgs couplings. Hence, the trinification model awaits crucial tests at the Large Hadron Collider in the coming years.

Figure 1

Most recent fit of the Higgs-coupling modifications to LHC data. The red points correspond to the expected SM result ${\mathrm{\Delta }}_x=0$, whereas the dark blue points give the results from the data if the photon coupling is assumed to be determined by the $W$ and $t$ loops only. The light blue points give the results if a free coupling shift in ${\mathrm{\Delta }}_{\gamma }$ due to new physics is allowed. Figure taken from Ref. [39].