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

Source: [New limits on effective Majorana neutrino masses from rare kaon decays](<https://www.sota2.com/research/paper/68fa25152c2a3760193ac84b>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T10:08:11.312Z

Authors: K. Zuber

Published: 2000-03-16T12:57:11.000Z

## Abstract

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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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/hep-ph/0003160>)

[PDF](<https://arxiv.org/pdf/hep-ph/0003160.pdf>)