Measurement of the Sigma^- Charge Radius by Sigma^- Electron Elastic Scattering

Details Measurement of the Sigma^- Charge Radius by Sigma^- Electron Elastic Scattering Measurement of the Sigma^- Charge Radius by Sigma^- Electron Elastic Scattering

2001-06-13

arxiv.org/abs/hep-ex/0106053v2

Phys.Lett.B522:233-239,2001

Physics

High Energy Physics

High Energy Physics - Experiment

12 pages, 4 figures, LaTeX, submitted to Phys Lett B. Revised: minor changes in text and references

Scientific paper

10.1016/S0370-2693(01)01285-0

The Sigma^- 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 Sigma^- 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 = (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^-.

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