K-meson neutrinoless double muon decay as a probe of neutrino masses and mixings

Details K-meson neutrinoless double muon decay as a probe of neutrino masses and mixings K-meson neutrinoless double muon decay as a probe of neutrino masses and mixings

2000-06-23

arxiv.org/abs/hep-ph/0006277v4

Phys.Lett. B493 (2000) 82-87

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 2 figures, Latex

Scientific paper

10.1016/S0370-2693(00)01134-5

Recently an upper bound on the rate of the lepton number violating decay $K^+\to \mu^+\mu^+\pi^-$ has been significantly reduced by the E865 experiment at BNL and further improvement is expected in the near future. We study this process as a possible source of information on neutrino masses and mixings. We find that it is insensitive to the light(eV domain) and heavy(GeV domain) neutrinos. However due to the effect of a resonant enhancement this decay is very sensitive to neutrinos $\nu_j$ in the mass region $245{MeV}\leq m_{\nu_j}\leq 389$ MeV. At present experimental sensitivity we deduce new stringent limits on the neutrino mixing matrix element $U_{\mu j}$ for neutrino masses in this region.

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