Measurements of the Sigmac0 and Sigmac++ Mass Splittings
The FOCUS Collaboration
Abstract
Using a high statistics sample of photoproduced charmed particles from the FOCUS experiment at Fermilab (FNAL-E831), we measure the mass splittings of the charmed baryons Sigmac0 and Sigmac++. We find M(Sigmac0 - Lambdac+) = 167.38 +/- 0.21 +/- 0.13 MeV/c2 and M(Sigmac++ - Lambdac+) = 167.35 +/- 0.19 +/- 0.12 MeV/c2 with samples of 362 +/- 36 and 461 +/- 39 events, respectively. We measure the isospin mass splitting M(Sigmac++ - Sigmac0) to be -0.03 +/- 0.28 +/- 0.11 Mev/c2. The first errors are statistical and the second are systematic.
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