PT Journal
AU Jittoh, T
   Kohri, K
   Koike, M
   Sato, J
   Shimomura, T
   Yamanaka, M
TI Stau relic density at the big-bang nucleosynthesis era in the coannihilation scenario and a solution to the Li-7 problem
SO Physical Review D
JI Phys. Rev. D
PY 2010
BP 115030 - 10pp
VL 82
IS 11
DI 10.1103/PhysRevD.82.115030
LA English
AB We calculate the relic density of stau at the big-bang nucleosynthesis era in the coannihilation scenario of the minimal supersymmetric standard model. In this scenario, stau can be long lived and have significance in the remediation of light elements abundances. The freeze-out of stau is corroborated by solving the Boltzmann equation numerically, and the parameter dependence of the relic density is investigated. The possibility of solving the Li-7 problem is examined by taking account into the long-lived stau. By adopting an observational value of Li-7 in [J. Melendez and I. Ramirez, Astrophys. J. 615, L33 (2004).], we get minimal supersymmetric standard model parameter space in which abundances of both dark matter and all of the light elements are reproduced in accordance with observations. We also address the influence of intergenerational mixing on our calculation.
ER