Four-fermion interactions and sgoldstino masses in models with a superlight gravitino

Details Four-fermion interactions and sgoldstino masses in models with a superlight gravitino Four-fermion interactions and sgoldstino masses in models with a superlight gravitino

1998-05-11

arxiv.org/abs/hep-ph/9805282v2

Phys.Lett. B438 (1998) 89-95

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 A4 pages, 1 figure, LATEX, uses axodraw.sty. Version to be published in Phys. Lett. B: an important spin-off on sgoldstino m

Scientific paper

10.1016/S0370-2693(98)00974-5

We discuss the role 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, complementary to those obtained from the direct production of supersymmetric particles. We also show that, generically, masses for the spin-0 partners of the goldstino (sgoldstinos) of the order of the gravitino mass and much smaller than squark and slepton masses do not obey a naturalness criterion.

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