Jul 16 – 22, 2009
Kraków, Poland
Europe/Warsaw timezone

Solving the Li problem by long lived stau in a stau-neutralino coannihilation scenario

Jul 18, 2009, 10:10 AM
Middle Lecture Hall B (Kraków, Poland)

Middle Lecture Hall B

Kraków, Poland

The Auditorium Maximum of the Jagiellonian University 33 Krupnicza Street 31-123 Kraków
Cosmology and Gravitational Waves I. Cosmology and Gravitational Waves


Dr Masato Yamanaka (ICRR, university of Tokyo)


A scenario of the big-bang nucleosynthesis is analyzed within the minimal supersymmetric standard model, which is consistent with a stau-neutralino coannihilation scenario to explain the relic abundance of dark matter. We find that we can account for the possible discrepancy of the abundance of 7Li between the observation and the prediction of the big-bang nucleosynthesis by taking the mass of the neutralino as 300GeV and the mass difference between the stau and the neutralino as (100 – 120)MeV. We can therefore simultaneously explain the abundance of the dark matter and that of 7Li by these values of parameters. The lifetime of staus in this scenario is predicted to be O(100 – 1000) sec.

Primary author

Dr Masato Yamanaka (ICRR, university of Tokyo)


Prof. Joe Sato (Saitama university) Dr Kazunori Kohri (Lancaster University) Dr Masafumi Koike (Saitama university) Dr Takashi Shimomura (University of Valencia) Dr Toshifumi Jittoh (Saitama university)

Presentation materials