Theory Seminar

KEK 素粒子原子核研究所・理論セミナー

TITLE Big-bang nucleosynthesis with a long-lived CHAMP including helium-4 spallation process
(英語 / in English)
SPEAKER Dr. Masato Yamanaka
DATE: May 17 (Tue.) 11:00 − 12:00
PLACE: Kenkyu Honkan 1F, Meeting Room 1


Long-lived charged massive particle (CHAMP) plays a role as catalyzer of exotic nuclear reactions in the Big-bang nucleosynthesis era. I discuss the primordial abundances of light elements involving the helium-4 spallation processes, the catalyzed fusion processes, and the internal conversion processes. Furthermore, I show the cosmologically favored parameter space in the minimal supersymmetric standard model with long-lived stau via solving the Lithium-7 problem.