Measurement of the Sigma(-) charge radius by Sigma(-)-electron elastic scattering


Eschrich I., Kruger H., Simon J., Vorwalter K., Alkhazov G., Atamantchouk A., ...More

PHYSICS LETTERS B, vol.522, pp.233-239, 2001 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 522
  • Publication Date: 2001
  • Doi Number: 10.1016/s0370-2693(01)01285-0
  • Title of Journal : PHYSICS LETTERS B
  • Page Numbers: pp.233-239

Abstract

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.