Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-07-17
Phys.Lett.B656:83-90,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
17 pages, 5 figures
Scientific paper
10.1016/j.physletb.2007.09.048
We study radiative gravitino decay within the framework of R-violating supersymmetry. For trilinear R-violating couplings that involve the third generation of fermions, or for light gravitinos, we find that the radiative loop-decay $\tilde{G} \to \gamma \nu$ dominates over the tree-level ones for a wide set of parameters. We calculate the gravitino decay width and study its implications for cosmology and collider physics. Slow-decaying gravitinos are good dark matter candidates, for a range of parameters that would also predict observable R-violating signatures in colliders. In general the branching ratios are very dependent on the relative hierarchies of R-violating operators, and may provide relevant information on the flavour structure of the underlying fundamental theory.
Lola Smaragda
Osland Per
Raklev Are R.
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