Abstract
THE ability to account quantitatively for the observed masses is certainly one of the tests a successful meson theory must meet. Experimental difficulties, however, make precise mass determinations almost impossible; and while a few theoretical attempts have yielded discrete mass values1, the experimental results are so indefinite as to make most comparisons inconclusive. More than fifty different measured masses, ranging from a few times that of the electron to around 25,000, have been reported by various investigators. In fact, there is some doubt as to whether the masses have unique values.
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References
Fürth, R., Nature, 162, 772 (1948). Born, M., and Green, H. S., Nature, 163, 207 (1949). Born, Rev. Mod. Phys., 21, 463 (1949).
Informal communication from Barkas, W., quoted by Rossi, B., Science, 110, 482 (1949).
Dumond, J., and Cohen, E., Rev. Mod. Phys., 20, 82 (1948).
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FREEMAN, I. Masses of the π- and µ-Mesons. Nature 165, 933 (1950). https://doi.org/10.1038/165933a0
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DOI: https://doi.org/10.1038/165933a0
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