Cosmological Constraints on Gravitino LSP Scenario with Sneutrino NLSP

Details Cosmological Constraints on Gravitino LSP Scenario with Sneutrino NLSP Cosmological Constraints on Gravitino LSP Scenario with Sneutrino NLSP

2006-09-25

arxiv.org/abs/hep-ph/0609246v1

Phys.Rev.D75:025011,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 6 figures

Scientific paper

10.1103/PhysRevD.75.025011

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 $\sim$ 1 sec. We also discuss the thermal leptogenesis in the sneutrino NLSP scenario.

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