The degenerate scenario in the NMSSM: Direct singlino-like neutralino searches with a gravitino LSP

Abstract

A two-component dark matter model is studied adopting the degenerate scenario in the R-parity conserving NMSSM. The gravitino LSP and the neutralino NLSP are extremely degenerate in mass, avoiding the BBN bounds and obtaining a high reheating temperature for thermal leptogenesis to work. In this model both gravitino (absolutely stable) and neutralino (quasi-stable) contribute to dark matter, and direct detection searches for neutralino are discussed. Points that survive all the constraints correspond to a singlino-like neutralino.

Comments: 8 pages, 6 figures, prepared for DISCRETE 2010, 6-11 December 2010, Sapienza Universita di Roma-ITALY