arXiv subjects
Publications and source records attributed to A. Ioannissyan.
We show how R-parity can break spontaneously as a result of radiative corrections in unified N=1 supergravity models. We illustrate this with a concrete rank-four unified model, where the spontaneous breaking of R-parity is accompanied by the existence of a physical majoron. We determine the resulting supersymmetric particle mass spectrum and show that R-parity-breaking signals may be detectable at LEP200.
We consider the asymmetry in the decay $Ω^-\rightarrowΞ^-γ$ assuming that a Vector Meson Dominance approach for the $s\rightarrow dγ$ transition gives the dominant contribution. Since in this long-distance approximation the decay is due to a single quark transition $s\rightarrow dγ$, the angular distribution asymmetry is given by the single positive asymmetry parameter $α_h = \frac{M^2_s-M^2_d}{M^2_s+M^2_d} = 0.4\pm0.1$. We also discuss the asymmetry in $Ξ\rightarrow Σ^-γ$, which is expected to be between -0.2 and 0.3.
This version corrects the first one in eq.3.4 and table 1 where there was a bar missing in the 126 representation. All other equations and results are unchanged and correct. However, the criticism we had made in the earlier version to the work of Caldwell and Mohapatra was not correct and has been removed from the "note added" where it appeared. Moreover one new reference has been added to ref.13.