Hadronic decay of late-decaying particles and big-bang nucleosynthesis

We study the big-bang nucleosynthesis (BBN) scenario with late-decaying exotic particles with lifetime longer than ∼1 s. With a late-decaying particle in the early universe, predictions of the standard BBN scenario can be significantly altered. Therefore, we derive constraints on its primordial abun...

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Bibliographic Details
Published inPhysics letters. B Vol. 625; no. 1; pp. 7 - 12
Main Authors Kawasaki, Masahiro, Kohri, Kazunori, Moroi, Takeo
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 06.10.2005
Elsevier Science
Subjects
Exact sciences and technology
Nuclear physics
Physics
The physics of elementary particles and fields
11.30.Pb
26.35.+c
98.80.-k
Branching ratio
Upper bound
Lifetime
Nucleosynthesis
Big bang
Early universe
Abundance
Cosmology
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Summary:We study the big-bang nucleosynthesis (BBN) scenario with late-decaying exotic particles with lifetime longer than ∼1 s. With a late-decaying particle in the early universe, predictions of the standard BBN scenario can be significantly altered. Therefore, we derive constraints on its primordial abundance. We pay particular attention to hadronic decay modes of such particles. We see that the non-thermal production process of D, 3He and 6Li provides a stringent upper bound on the primordial abundance of late-decaying particles with hadronic branching ratio.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2005.08.045