Erratum: Supernova constraints on a superlight gravitino [Phys. Rev. D57, 578 (1998)]

Supernova Constraints on a Superlight Gravitino

In supergravity models with low supersymmetry breaking scale the gravitinos can be superlight, with mass in the 10 eV to few keV range. In such a case, gravitino emission provides a new cooling mechanism for protoneutron stars and therefore can provide constraints on the mass of a superlight gravitino. This happens because the coupling to matter of superlight gravitinos is dominated by its gold...

Constraints on the mass of the superlight gravitino from the muon anomaly

We reexamine the limits on the gravitino mass supplied by the muon anomaly in the frame of supergravity models with a superlight gravitino and a su-perlight scalar S and a superlight pseudoscalar P .

Superlight gravitino and four - fermion interactions 1

We discuss the rôle of the effective interactions among four matter fermions in supersymmetric models with a very light gravitino. We show that, from a field-theoretical viewpoint, no model-independent bound on the gravitino mass can be derived from such interactions. Making use of a naturalness criterion, however, we are able to derive some interesting but not very stringent bounds, complement...

CERN-TH/98-11 DFPD 98/TH/04 Signals of a superlight gravitino at hadron colliders

If the gravitino G̃ is very light and all the other supersymmetric particles are above threshold, supersymmetry may still be found at colliders, by looking at processes with only gravitinos and ordinary particles in the final state. We compute here the cross-sections for some distinctive signals at hadron colliders: photon plus missing energy, induced by qq → G̃G̃γ, and jet plus missing energy, in...

Tree Unitarity Breakdown in Spontaneously Broken N=1 Supergravity Theories and Phenomenology of a Superlight Gravitino