A New Measurement of the Rare Decay $K^{+}\to {\pi }^{+}{\mu }^{+}{\mu }^{-}$

Abstract

More than 400 $K^{+}\to {\pi }^{+}{\mu }^{+}{\mu }^{-}$ events were observed in a rare $K^{+}$ decay experiment at the AGS. Normalized to the $K^{+}\to {\pi }^{+}{\pi }^{+}{\pi }^{-}$ decay, the branching ratio is determined to be $(9.22\pm 0.60(stat)\pm 0.49(syst))\times 10^{-8}$. This branching ratio and the $\mu \mu$ mass spectrum is in very good agreement with the measurement of the $K^{+}\to {\pi }^{+}{e}^{+}{e}^{-}$ decay, but deviates significantly from the previous measurement.

arXiv comment4 pages, 6 figures in 7 eps files. Paper to be submitted to Phys Rev Lett

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• Has HyperCP Observed a Light Higgs Boson?
• Implications of a new particle from the HyperCP data on Σ^+ \to p μ^+ μ^-
• Observation of the Decay K- -> pi- mu+ mu- and Measurements of the Branching Ratios for K+/- -> pi+/- mu+ mu-
• Neutrino oscillation experiments and limits on lepton-number and lepton-flavor violating processes
• Developments in Rare Kaon Decay Physics
• Radiative corrections in K --> pi l+ l- decays
• Light Higgs Production in Hyperon Decay
• Forward-backward Asymmetry in $K^{+}\to {\pi }^{+}{\ell }^{+}{\ell }^{-}$
• Muon Decay Asymmetries from $K_L^0\to {\pi }^0{\mu }^{+}{\mu }^{-}$ Decays
• Contributions from SUSY-FCNC couplings to the interpretation of the HyperCP events for the decay Σ^+ \to p μ^+ μ^-
• Rare Decays with a Light CP-Odd Higgs Boson in the NMSSM
• Tests of the Standard Model Using Muon Polarization Asymmetries in Kaon Decays
• First observation of the decay K+ -> e+ nu mu+ mu-
• Kaon Physics at BNL
• Possible manifestation of the 2p pionium in particle physics processes
• CPV tests with rare kaon decays