Big-bang nucleosynthesis with long-lived charged slepton

Big-Bang Nucleosynthesis with Long-Lived Charged Slepton

We consider constraints on long-lived charged scalar leptons l̃ in supersymmetric models, where gravitino is the lightest superparticle. We study the decay and hadronization processes of l̃. We also take into account the significant enhancement of 6Li production due to the formation of the bound-state (4Hel̃−); for this purpose, we use the reaction rate given by the most recent calculation based o...

Big-Bang Nucleosynthesis Reactions Catalyzed by a Long-Lived Negatively-Charged Leptonic Particle

Accurate quantum three-body calculation is performed for the new rank of big-bang nucleosynthesis (BBN) reactions that are catalyzed by a hypothetical long-lived negativelycharged, massive leptonic particle (called X−) such as a supersymmetric (SUSY) particle stau, the scalar partner of the tau lepton. It is known that if the X− particle has a lifetime of τX >∼ 10 3 s, it would capture a light ...

Big Bang Nucleosynthesis

Big Bang Nucleosynthesis: Reprise

Recent observational and theoretical developments concerning the primordial synthesis of the light elements are reviewed, and the implications for dark matter mentioned.

Assessing Big-Bang nucleosynthesis.

Systematic uncertainties in the light-element abundances and their evolution make a rigorous statistical assessment difficult. However, using Bayesian methods we show that the following statement is robust: the predicted and measured abundances are consistent with 95% credibility only if the baryon-to-photon ratio is between 2× 10 and 6.5× 10 and the number of light neutrino species is less tha...