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Observation of the charmed baryon sigma(c)+ and measurement of the isospin mass splittings of the sigma(c)
Ammar, Raymond G. Ball, S. Baringer, Philip S. Coppage, Don Copty, N. Davis, Robin E. P. Hancock, N. Kelly, M. Kwak, Nowhan Lam, H.
Ammar, Raymond G.
Ball, S.
Baringer, Philip S.
Coppage, Don
Copty, N.
Davis, Robin E. P.
Hancock, N.
Kelly, M.
Kwak, Nowhan
Lam, H.
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Abstract
We observe the SIGMA(c)+ baryon decaying to LAMBDA(c)+pi0 and measure the mass difference M(SIGMA(c)+) - M(LAMBDA(c)+) to be 168.5 +/- 0.4 +/- 0.2 MeV/c2. We also measure the mass differences M(SIGMA(c)++) - M(LAMBDA(c)+) and M(SIGMA(c)0) - M(LAMBDA(c)+) with improved precision and determine the isospin mass splittings M(SIGMA(c)++) - M(SIGMA(c)0) and M(SIGMA(c)+) - M(SIGMA(c)0) to be 1.1 +/- 0.4 +/- 0.1 MeV/c2 and 1.4 +/- 0.5 +/- 0.3 MeV/c2, respectively. Our results indicate that the light quark mass difference does not dominate the isospin mass splitting in SIGMA(c).
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1993-11
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AMERICAN PHYSICAL SOC
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p3259_1.pdf
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CRAWFORD, G, DAUBENMIER, CM, et al. Observation of the charmed baryon sigma(c)+ and measurement of the isospin mass splittings of the sigma(c). PHYSICAL REVIEW LETTERS. November 1993. 71(20) : 3259-3262