Abstract
From a survey of all the available experimental data on the charge ratio of muons in the cosmic radiation a best estimate of its energy dependence is presented, both in the vertical direction and at large zenith angles. A discussion is given of the relevant parameters for its interpretation and the predictions of various models of particle production are investigated. It is found that pionization alone is unable to explain the data, even allowing for fluctuations in inelasticity and multiplicity to the extent observed in other high-energy experiments. The parameters of models involving kaon and pion production needed to explain the ratio are determined. At present, explanation in terms of kaon production is slightly more probable.
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