Phenomenology with Supersymmetric Flipped SU(6)

Abstract

The supersymmetric flipped $SU(6)\times U(1)$ gauge symmetry can arise through compactification of the ten dimensional $E_8\times E_8$ superstring theory. We show how realistic phenomenology can emerge from this theory by supplementing it with the symmetry $\mathcal{R}\times \mathcal{U}(1)$, where $\mathcal{R}$ denotes a discrete `R'-symmetry. The well-known doublet-triplet splitting problem is resolved to `all orders' via the pseudo-Goldstone mechanism, and the GUT scale arises from an interplay of the Planck and supersymmetry breaking scales. The symmetry $\mathcal{R}\times \mathcal{U}(1)$ is also important for understanding the fermion mass hierarchies as well as the magnitudes of the CKM matrix elements. Furthermore, the well known MSSM parameter $\tan \beta$ is estimated to be of order unity, while the proton lifetime (${\tau }_p\sim 10^2{\tau }_{pSU(5)}$) is consistent with observations. Depending on some parameters, $p\to K{\mu }^{+}$ can be the dominant decay mode. Finally, the observed solar and atmospheric neutrino `anomalies' require us to introduce a `sterile' neutrino state. Remarkably, the $\mathcal{R}\times \mathcal{U}(1)$ symmetry protects it from becoming heavy, so that maximal angle ${\nu }_{\mu }$ oscillations into a sterile state can explain the atmospheric anomaly, while the solar neutrino puzzle is resolved via the small angle ${\nu }_e-{\nu }_{\tau }$ MSW oscillations. The existence of some ($\sim 15-20$ of critical energy density) neutrino hot dark matter is also predicted.

24 pp. LATEX. Modified version accepted for Nucl. Phys. B

References in corpus (1)

• Where do we stand with solar neutrino oscillations?

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