Stau-catalyzed $^6$Li Production in Big-Bang Nucleosynthesis

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dc.creatorHamaguchi, K.
dc.creatorHatsuda, T.
dc.creatorKamimura, M.
dc.creatorKino, Y.
dc.creatorYanagida, T. T.
dc.date2007-02-27
dc.date.accessioned2026-07-07T11:02:47Z
dc.date.available2026-07-07T11:02:47Z
dc.descriptionIf the gravitino mass is in the region from a few GeV to a few 10's GeV, the scalar lepton X such as stau is most likely the next lightest supersymmetry particle. The negatively charged and long-lived X^- may form a Coulomb bound state (A X) with a nucleus A and may affect the big-bang nucleosynthesis through catalyzed fusion process. We calculate a production cross section of Li6 from the catalyzed fusion (He4 X^-) + d \to Li6 + X^- by solving the Schrödinger equation exactly for three-body system of He4, d, and X. We utilize the state-of-the-art coupled-channel method, which is known to be very accurate to describe other three-body systems in nuclear and atomic reactions. The importance of the use of appropriate nuclear potential and the exact treatment of the quantum tunneling in the fusion process are emphasized. We find that the astrophysical S-factor at the Gamow peak corresponding to T=10 keV is 0.038 MeV barn. This leads to the Li6 abundance from the catalyzed process as Li6|_{CBBN}\simeq 4.3\times 10^{-11} (D/2.8\times 10^{-5}) ([n_{X^-}/s]/10^{-16}) in the limit of long lifetime of X. Particle physics implication of this result is also discussed.
dc.description16 pages, 7 figures
dc.identifierhttps://arxiv.org/abs/hep-ph/0702274
dc.identifierhttp://arxiv.org/abs/hep-ph/0702274
dc.identifierPhys.Lett.B650:268-274,2007
dc.identifierdoi:10.1016/j.physletb.2007.05.030
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/188369
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectAstrophysics
dc.subjectNuclear Theory
dc.titleStau-catalyzed $^6$Li Production in Big-Bang Nucleosynthesis
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