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We place constraints on the abundance of quasistable particles with hadronic decay modes using the upper bounds on primordially produced ⁴He and the sum of D and ³He abundances. The results are presented as a function of particle lifetime (ranging between 10^-1 and 10⁴ sec), particle mass, and hadronic branching ratio. We apply our results to the cases of gravitinos, photinos in R ̃ \~{}{}-parity-violating theories, and mirror quarks. We also discuss another mechanism for hadron injection: cold-dark-matter annihilation.
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Reno et al. (1988) studied this question.
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