Grand unification and parity restoration at low energies. Phenomenology

Recently, we have shown that simple grand unified theories, such as SO(10), allow the possibility of low-energy parity restoration. In this paper a detailed phenomenological analysis of the left-right-symmetric model is presented. It turns out that the theory passes all the charged- and neutral-current tests for $M_{W_R}$ as low as 100-300 GeV, if simultaneously ${{sin}^2\theta }_W\simeq 0.25-0.31$. We also estimate masses, widths, and branching ratios for the gauge bosons, as well as their production rates in $\mathrm{pp}$ and $\overline{p}p$ reactions.