Eur. Phys. J. C (2010) 67: 181-190
https://doi.org/10.1140/epjc/s10052-010-1267-9

Regular Article - Theoretical Physics

Radiative neutralino decay in split supersymmetry

Departamento de Física, Universidad Católica de Chile, Avenida Vicuña Mackenna 4860, Santiago, Chile

^* e-mail: bapanes@uc.cl

Received: 21 January 2010
Published online: 25 February 2010

Abstract

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.