New decay modes of gravitino dark matter

作者：Choi Ki Young^*; Yaguna Carlos E

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2010, 82(1): 015008.

DOI：10.1103/PhysRevD.82.015008

We consider the three-body decays of gravitino dark matter in supersymmetric scenarios with bilinear R-parity violation. In particular, gravitino decays into lW* (lf (f) over bar') and vZ* (vf (f) over bar) are examined for gravitino masses below M(W). After computing the gravitino decay rates into these three-body final states and studying their dependence on supersymmetric parameters, we find that these new decay modes are often more important than the two-body decay, into a photon and a neutrino, considered in previous works. Consequently, the gravitino lifetime and its branching ratios are substantially modified, with important implications for the indirect detection of gravitino dark matter.

• 出版日期2010-7-23