出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：In supersymmetric models with violation of R-parity the lightest supersymmetric particle decays.
Thus, the usual SUSY candidate for the dark matter in the universe - the lightest neutralino, c˜ 0
1
- is lost. If instead the gravitino is the LSP, as happens, for example, in models with gauge
mediated supersymmetry breaking, the gravitino decays with a half-live far exceeding the age
of the universe and thus can potentially solve the dark matter problem. Here, the decays of the
next-to-lightest supersymmetric particle, assumed to be the neutralino, are considered in such a
scenario. In models of bilinear R-parity breaking, data from neutrino oscillation experiments fixes
the branching ratio of the decay c˜ 0
1 ˜Gg in the range 10
3
10
2, if the gravitino mass is of the
order (few) 100 eV. The combined hypothesis of bilinear R-parity violation plus (light) gravitino
dark matter is therefore directly testable at the next generation of colliders.
