Cosmological constraints on R-parity violation from neutrino decay

Details Cosmological constraints on R-parity violation from neutrino decay Cosmological constraints on R-parity violation from neutrino decay

2000-04-12

arxiv.org/abs/hep-ph/0004108v3

Phys.Rev. D62 (2000) 093007

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, Latex, uses axodraw.sty; version to appear in Physical Review D

Scientific paper

10.1103/PhysRevD.62.093007

If the neutrino mass is non-zero, as hinted by several experiments, then R-parity-violating supersymmetric Yukawa couplings can drive a heavy neutrino decay into lighter states. The heavy neutrino may either decay radiatively into a lighter neutrino, or it may decay into three light neutrinos through a Z-mediated penguin. For a given mass of the decaying neutrino, we calculate its lifetime for the various modes, each mode requiring certain pairs of R-parity-violating couplings be non-zero. We then check whether the calculated lifetimes fall in zones allowed or excluded by cosmological requirements. For the latter case, we derive stringent new constraints on the corresponding products of R-parity-violating couplings for given values of the decaying neutrino mass.

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