Indirect detection of gravitino dark matter including its three-body decays

ABSTRACT: It was recently pointed out that in supersymmetric scenarios with gravitino dark matter and bilinear R-parity violation, gravitinos with masses below MW typically decay with a sizable branching ratio into the 3-body final states W∗ l and Z ∗ν. In this paper we study the indirect detection signatures of gravitino dark matter including such final states. First, we obtain the gamma ray spectrum from gravitino decays, which features a monochromatic contribution from the decay into γν and a continuum contribution from the three-body decays. After studying its dependence on supersymmetric parameters, we compute the expected gamma ray fluxes and derive new constraints, from recent FERMI data, on the R-parity breaking parameter and on the gravitino lifetime. Indirect detection via antimatter searches, a new possibility brought about by the three-body final states, is also analyzed. For models compatible with the gamma ray observations, the positron signal is found to be negligible whereas the antiproton one can be significant.

• Autores: Restrepo Quintero, Diego Alejandro; Choi, Ki-Young; Yaguna Toro, Carlos Esteban; Zapata Noreña, Oscar Alberto
• Tipo de recurso: Article of investigation
• Fecha de publicación: 2010
• Institución: Universidad de Antioquia
• Repositorio: Repositorio UdeA
• Idioma: eng
• OAI Identifier: oai:bibliotecadigital.udea.edu.co:10495/42993
• Acceso en línea: https://hdl.handle.net/10495/42993
• Palabra clave: Materia oscura (astronomía); Dark matter (Astronomy); http://id.loc.gov/authorities/subjects/sh87007317
• Rights: openAccess
• License: http://creativecommons.org/licenses/by-nc-sa/2.5/co/