Precise measurement of the {Sigma}{sup 0} mass

Journal Article · Mon Sep 01 04:00:00 EDT 1997 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.56.2544· OSTI ID:538690

Wang, M H; Hartouni, E P; Kreisler, M N; Uribe, J ^[1]; Church, M D; Gottschalk, E E; Knapp, B C; Stern, B J; Wiencke, L R ^[2]; Christian, D C; Gutierrez, G; Wehmann, A ^[3]; Avilez, C; Felix, J; Moreno, G ^[4]; Forbush, M; Huson, F R; White, J T ^[5]

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1. Department of Physics and Astronomy, University of Massachusetts, Amherst, Massachusetts 01003 (United States)
2. Columbia University, Nevis Laboratories, Irvington, New York 10533 (United States)
3. Fermilab, Batavia, Illinois 60510 (United States)
4. Instituto de Fisica, Universidad de Guanajuato, 37150 Leon, Guanajuato (Mexico)
5. Department of Physics, Texas AM University, College Station, Texas 77843 (United States)

We have obtained precise measurements of the {Sigma}{sup 0} mass and the {Sigma}{sup 0}-{Lambda}{sup 0} mass difference from a fit to the {Lambda}{sup 0}{gamma} invariant mass distribution of 3327 {Sigma}{sup 0}{r_arrow}{Lambda}{sup 0}+{gamma} decays. Our measurements yield M{sub {Sigma}{sup 0}}=1192.65{plus_minus}0.020{plus_minus}0.014 MeV/c{sup 2} and M{sub {Sigma}{sup 0}}{minus}M{sub {Lambda}{sup 0}}=76.966{plus_minus}0.020{plus_minus}0.013 MeV/c{sup 2}, 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 {Sigma}{sup 0} mass itself. {copyright} {ital 1997} {ital The American Physical Society}

• Research Organization: Fermi National Accelerator Laboratory
• DOE Contract Number: AC02-76CH03000; AS05-87ER40356
• OSTI ID: 538690
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 5 Vol. 56; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
GAMMA DECAY
LAMBDA BARYONS
MASS
MASS DIFFERENCE
MASS DISTRIBUTION
NEUTRAL PARTICLES
PHOTONS
SIGMA BARYONS