Radiative Decay of a Long-Lived Particle and Big-Bang Nucleosynthesis

Details Radiative Decay of a Long-Lived Particle and Big-Bang Nucleosynthesis Radiative Decay of a Long-Lived Particle and Big-Bang Nucleosynthesis

1998-05-20

arxiv.org/abs/hep-ph/9805405v3

Phys.Rev.D60:023506,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

Published version in Phys. Rev. D. Typos in figure captions corrected

Scientific paper

10.1103/PhysRevD.60.023506

The effects of radiatively decaying, long-lived particles on big-bang nucleosynthesis (BBN) are discussed. If high-energy photons are emitted after BBN, they may change the abundances of the light elements through photodissociation processes, which may result in a significant discrepancy between the BBN theory and observation. We calculate the abundances of the light elements, including the effects of photodissociation induced by a radiatively decaying particle, but neglecting the hadronic branching ratio. Using these calculated abundances, we derive a constraint on such particles by comparing our theoretical results with observations. Taking into account the recent controversies regarding the observations of the light-element abundances, we derive constraints for various combinations of the measurements. We also discuss several models which predict such radiatively decaying particles, and we derive constraints on such models.

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