August 28, 2011 to September 2, 2011
US/Central timezone
Slides available on Indico -- there are no formal proceedings

Goldstini as the decaying dark matter

Aug 29, 2011, 3:10 PM
C: Hornets Nest Wilson Hall 8N Xover

C: Hornets Nest Wilson Hall 8N Xover


Wei-Chih Huang (Northwestern University)


We consider a new scenario for supersymmetric decaying dark matter without $R$-parity violation in theories with goldstini, which arise if supersymmetry is broken independently by multiple sequestered sectors. The uneaten goldstino naturally has a long lifetime and decays into three-body final states including the gravitino, which escapes detection, and two visible particles. The goldstini low-energy effective interactions are derived, which can be non-universal and allow the dark matter to be leptophilic, in contrast to the case of a single sector supersymmetry breaking. In addition, the three-body decay with a missing particle gives a softer spectrum. Consequently, it is possible to fit both the $e^+/e^-$ excess observed by the PAMELA and the $e^++e^-$ measurements by the Fermi-LAT using universal couplings to all three lepton flavors or 100\% branching fraction into electrons/positrons, both of which are disfavored in the conventional scenario of dark matter decays into two or four visible particles without missing energy.

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