New limits on effective Majorana neutrino masses from rare kaon decays

Abstract

The rare kaon decay $K^+ \ra π^- μ^+ μ^+$ is violating lepton number by two units and is investigated within the context of Majorana neutrino masses. Using a new upper bound for this decay from E865 an upper limit on the effective Majorana mass term $\m_{μμ} < 500$ GeV could be obtained. This is improving existing bounds by about one order of magnitude. Implications on heavy neutrinos are discusse d as well as future possibilities to improve limits on this as well as other elements of the Majorana m ass matrix are investigated.

7 pages, 3 eps-figures, to be published in Phys. Lett. B

References in corpus (1)

• Bounds on effective Majorana neutrino masses at HERA

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