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- W2012047875 abstract "We point out that the existence of metastable, τ >10 3 s, negatively charged electroweak-scale particles (X – ) alters the predictions for lithium and other primordial elemental abundances for A > 4 via the formation of bound states with nuclei during Big-Bang nucleosynthesis (BBN). In particular, we show that the bound states of X – with helium, formed at temperatures of about T = 10 8 K, lead to the catalytic enhancement of 6 Li production, which is eight orders of magnitude more efficient than the standard channel. In particle physics models, where subsequent decay of X – does not lead to large nonthermal BBN effects, this directly translates to the level of sensitivity to the number density of long-lived X – particles (τ > 10 5 s) relative to entropy of n X – / s [Formula: see text] 3 × 10 –17 , which is one of the most stringent probes of electroweak scale remnants known to date. It is also argued that unstable charged particles with lifetime of order ~2000 s may naturally lead to the depletion of 7 Li by a factor of two, making it consistent with observationally determined abundances. PACS No.: 98.80.Ft" @default.
- W2012047875 created "2016-06-24" @default.
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- W2012047875 date "2008-04-01" @default.
- W2012047875 modified "2023-09-25" @default.
- W2012047875 title "Catalyzed Big-Bang nucleosynthesis" @default.
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- W2012047875 doi "https://doi.org/10.1139/p07-206" @default.
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