期刊
PHYSICS LETTERS B
卷 522, 期 3-4, 页码 233-239出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0370-2693(01)01285-0
关键词
electromagnetic form factors; elastic scattering; hadron-induced elastic scattering at high energy; hyperons; electron-Sigma(-) elastic scattering; Sigma(-) form factor; Sigma(-) charge radius; hadron strong and electromagnetic radii
The Sigma (-) mean squared charge radius has been measured in the space-like Q(2) range 0.035--0.105 GeV2/c(2) by elastic scattering of a Sigma (-) beam off atomic electrons. The measurement was per-formed with the SELEX (E781) spectrometer using the Fermilab hyperon beam at a mean energy of 610 GeV/c We obtain Sigma (-) =(0.61 +/- 0.12(stat.) +/- 0.09(syst.)) fm(2). The proton and pi (-) charge radii were measured as well and are consistent with results of other experiments. Our result agrees with the recently measured strong interaction radius of the Sigma (-). (C) 2001 Elsevier Science B.V. All rights reserved.
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