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A search for the rare K⁺ decay mode K⁺→π⁺νν has been carried out using stopping K⁺ mesons in a heavy-liquid bubble chamber. No events were found, and an upper limit on the branching ratio of this mode of 5 ×{} 10^-5 to all K⁺ decays is obtained. Comparison is made with various theories which imply the existence of neutral neutrino currents.
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Camerini et al. (1969) studied this question.
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