First Observation of the ${\Sigma }_c^{\ast +}$ Baryon and a New Measurement of the ${\Sigma }_c^{+}$ Mass

Abstract

Using data recorded with the CLEO II and CLEO II.V detector configurations at the Cornell Electron Storage Rings, we report the first observation and mass measurement of the ${\Sigma }_c^{\ast +}$ charmed baryon, and an updated measurement of the mass of the ${\Sigma }_c^{+}$ baryon. We find $M({\Sigma }_c^{\ast +})-M({\Lambda }_c^{+})$= 231.0 +- 1.1 +- 2.0 MeV, and $M({\Sigma }_c^{+})-M({\Lambda }_c^{+})$= 166.4 +- 0.2 +- 0.3 MeV, where the errors are statistical and systematic respectively.

8 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS

References in corpus (1)

• New experimental tests of sum rules for charmed baryon masses

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