Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-02-21
Nucl.Phys. B580 (2000) 331-351
Physics
High Energy Physics
High Energy Physics - Phenomenology
Figure 7 changed. (30 pages, 7 ps-figures, 2 tables. Subm to NPB)
Scientific paper
10.1016/S0550-3213(00)00203-0
Constraints on the lifetime of the heavy sterile neutrino, that was proposed as a possible interpretation of the KARMEN anomaly, are derived from primordial nucleosynthesis and SN 1987A. Together with the recent experimental bounds on the nu_s lifetime, SN 1987A completely excludes this interpretation. Nucleosynthesis arguments permit a narrow window for the lifetime in the interval 0.1-0.2 sec. If nu_s possesses an anomalous interaction with nucleons, the SN bounds may not apply, while the nucleosynthesis ones would remain valid.
Dolgov Alexander. D.
Hansen Steen H.
Raffelt Georg
Semikoz Dmitri V.
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