Mass of the Σ+ Hyperon

Phys. Rev. 103, 226 – Published 1 July 1956
W. F. Fry, J. Schneps, G. A. Snow, and M. S. Swami


Ten examples of the protonic decay from rest of the Σ+ hyperon have been analyzed. The ranges of the protons from the Σ+ decays were corrected for variations in the stopping power of each emulsion batch by determining the mean range of μ mesons from π-μ decays. The mean range of the protons, after correcting for variations in stopping power, was found to be 1669.4±8.0 microns. The rms deviation of the proton ranges was found to be 38.5±8.0 microns. The Q of the Σ+ decay, Σ+p+π0 is 116.1±0.5 Mev, and the mass of the Σ+ hyperon is (2327.4±1.0)me.


  • Received 20 March 1956
  • Published in the issue dated July 1956

© 1956 The American Physical Society

Authors & Affiliations

W. F. Fry, J. Schneps, G. A. Snow*, and M. S. Swami

  • Department of Physics, University of Wisconsin, Madison, Wisconsin

  • *Present address, Nucleonics Division, Naval Research Laboratory, Washington, D. C.

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