Radiative Neutralino Decay in Split Supersymmetry

Details Radiative Neutralino Decay in Split Supersymmetry Radiative Neutralino Decay in Split Supersymmetry

2009-10-08

arxiv.org/abs/0910.1554v2

Eur.Phys.J.C67:181-190,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages and 10 figures

Scientific paper

10.1140/epjc/s10052-010-1267-9

Radiative neutralino decay $\chi^0_2 -> \chi^0_1\gamma$ is studied in a Split Supersymmetric scenario, and compared with mSUGRA and MSSM. This 1-loop process has a transition amplitude which is often quite small, but 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 $\chi^0_2 -> \chi^0_1 f\overline f$, and we obtain large values for the branching ratio $B(\chi^0_2 -> \chi^0_1\gamma)$ which can be close to unity in the region $M_2 \sim M_1$. Furthermore, the value for the radiative neutralino decay branching ratio has a strong dependence on the split supersymmetric scale $\widetilde{m}$, which is otherwise very difficult to infer from experimental observables.

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