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Phys. Rev. D 56, 2544 - 2547 (1997)

Precise measurement of the Σ0 mass

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M. H. L. S. Wang, E. P. Hartouni, M. N. Kreisler, and J. Uribe
Department of Physics and Astronomy, University of Massachusetts, Amherst, Massachusetts 01003

M. D. Church, E. E. Gottschalk, B. C. Knapp, B. J. Stern, and L. R. Wiencke
Columbia University, Nevis Laboratories, Irvington, New York 10533

D. C. Christian, G. Gutierrez, and A. Wehmann
Fermilab, Batavia, Illinois 60510

C. Avilez, J. Félix, and G. Moreno
Instituto de Física, Universidad de Guanajuato, 37150 Léon, Guanajuato, México

M. Forbush, F. R. Huson, and J. T. White
Department of Physics, Texas A&M University, College Station, Texas 77843

Received 20 March 1997

We have obtained precise measurements of the Σ0 mass and the Σ0-Λ0 mass difference from a fit to the Λ0γ invariant mass distribution of 3327 Σ0→Λ0+γ decays. Our measurements yield MΣ0=1192.65±0.020±0.014 MeV/c2 and MΣ0-MΛ0=76.966±0.020±0.013 MeV/c2, where the uncertainties are statistical and systematic in that order. This represents a significant improvement over all previous determinations and is the first direct measurement of the Σ0 mass itself.


©1997 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevD.56.2544
DOI: 10.1103/PhysRevD.56.2544
PACS: 14.20.Jn, 13.40.Hq

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