Cosmological Constraints on Gravitino LSP Scenario with Sneutrino NLSP
Toru Kanzaki, Masahiro Kawasaki, Kazunori Kohri, Takeo Moroi
Abstract
We study the scenario where a sneutrino is the next lightest supersymmetric particle (NLSP) and decays into a gravitino and standard model particles. The daughter particles such as neutrinos and quarks cause electro- and hadronic showers and affect big-bang nucleosynthesis. It is found that despite a small branching ratio, four-body processes including quarks in the final state give the most stringent constraint on the sneutrino abundance for gravitino mass of 1 - 100 GeV. Pion production by high energy neutrinos is important when the sneutrinos decay at 1 sec. We also discuss the thermal leptogenesis in the sneutrino NLSP scenario.
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