The electromagnetic form factor of the negative kaon has been measured by direct scattering of 250-GeV/c kaons from the stationary electrons of a liquid-hydrogen target The deviation of the measured elastic scattering cross section from the point cross section may be characterized by a root-mean-square kaon radius of 〈r_K^-²〉1/2=0.53±0.05 fm.
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Dally et al. (1980) studied this question.
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