Observation of the charmed Baryon Sigma (c)+ and measurement of the isospin mass splittings of the Sigma(c)

We observe the Σc+ baryon decaying to Λc+π0 and measure the mass difference M(Σc+)-M(Λc+) to be 168.5±0.2 MeV/c2. We also measure the mass differences M(Σc++)-M(Λc+) and M(Σc0-M(Λc+) with improved precision and determine the isospin mass splittings M(Σc++)-M(Σc0) and M(Σc+)-M(Σc0) 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 Σc.

electron positron: colliding beams
colliding beams: electron positron
electron positron: annihilation
annihilation: electron positron
multiplet: mass difference
mass difference: multiplet
CLEO
experimental results
Cornell Cornell CESR Stor Stor
approx. 10.5 GeV-cms

References(17)

Figures(0)

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