Four-fermion interactions and sgoldstino masses in models with a superlight gravitino
Abstract
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, 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.
- Publication:
-
Physics Letters B
- Pub Date:
- October 1998
- DOI:
- 10.1016/S0370-2693(98)00974-5
- arXiv:
- arXiv:hep-ph/9805282
- Bibcode:
- 1998PhLB..438...89B
- Keywords:
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- High Energy Physics - Phenomenology;
- High Energy Physics - Theory
- E-Print:
- 9 A4 pages, 1 figure, LATEX, uses axodraw.sty. Version to be published in Phys. Lett. B: an important spin-off on sgoldstino masses added