Cosmological Bound on the Decay $π^0\rightarrowγX$

Details Cosmological Bound on the Decay $π^0\rightarrowγX$ Cosmological Bound on the Decay $π^0\rightarrowγX$

1993-06-29

arxiv.org/abs/hep-ph/9306326v1

Phys.Rev.D48:2941-2942,1993

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, IP-ASTP-03-93

Scientific paper

10.1103/PhysRevD.48.2941

Using the upper bound on the effective number of light neutrino species during primordial nucleosynthesis and the cosmological pion-pole mechanism $\gamma\gamma\rightarrow \pi^0\rightarrow \gamma X$, we obtain an upper limit on the branching ratio for the decay BR$(\pi^0\rightarrow \gamma X)<3\times 10^{-13}$, where $X$ is any long-lived weakly interacting neutral vector particle with mass smaller than the neutral pion mass.

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