Regular Article - Theoretical Physics
Radiative neutralino decay in split supersymmetry
Departamento de Física, Universidad Católica de Chile, Avenida Vicuña Mackenna 4860, Santiago, Chile
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Published online: 25 February 2010
Radiative neutralino decay is studied in a Split Supersymmetric scenario, and compared with mSUGRA and MSSM. This one-loop process has a transition amplitude which is often quite small, but it has the advantage of providing a very clear and distinct signature: electromagnetic radiation plus missing energy. In Split Supersymmetry this radiative decay is in direct competition with the tree-level three-body decay , and we obtain large values for the branching ratio which can be close to unity in the region M 2∼M 1, something already seen in the MSSM. Furthermore, the values for the radiative and the tree-level neutralino decay branching ratios have a strong dependence on the logarithm of the split supersymmetric scale , which otherwise is very difficult to infer from experimental observables.
© Springer-Verlag / Società Italiana di Fisica, 2010