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The Σ − mean squared charge radius has been measured in the space-like Q 2 range 0.035–0.105 GeV 2 /c 2 by elastic scattering of a Σ − beam off atomic electrons. The measurement was performed with the SELEX (E781) spectrometer using the Fermilab hyperon beam at a mean energy of 610 GeV/c. We obtain 〈r 2ch 〉Σ − =(0.61±0.12(stat.)±0.09(syst...
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