New limits on effective Majorana neutrino masses from rare kaon decays

Details New limits on effective Majorana neutrino masses from rare kaon decays New limits on effective Majorana neutrino masses from rare kaon decays

2000-03-16

arxiv.org/abs/hep-ph/0003160v1

Phys.Lett. B479 (2000) 33-36

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

10.1016/S0370-2693(00)00333-6

The rare kaon decay $K^+ \ra \pi^- \mu^+ \mu^+$ 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 $\m_{\mu \mu} < 500$ 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.

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