Observation of the charmed baryon [Sigma][sub [ital c]][sup +] and measurement of the isospin mass splittings of the [Sigma][sub [ital c]]

Journal Article · Mon Nov 15 04:00:00 EST 1993 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.71.3259· OSTI ID:5432073

Crawford, G; Daubenmier, C M; Fulton, R; Fujino, D; Gan, K K; Honscheid, K; Kagan, H; Kass, R; Lee, J; Malchow, R; Morrow, F; Skovpen, Y; Sung, M; White, C; Whitmore, J; Wilson, P; Butler, F; Fu, X; Kalbfleisch, G; Lambrecht, M ; Ross, W R; Skubic, P; Snow, J; Wang, P L; Wood, M; Bortoletto, D; Brown, D N; Fast, J; McIlwain, R L; Miao, T; Miller, D H; Modesitt, M; Schaffner, S F; Shibata, E I; Shipsey, I P.J.; Wang, P N; Battle, M; Ernst, J; Kroha, H; Roberts, S; Sparks, K; Thorndike, E H; Wang, C H; Dominick, J; Sanghera, S; Skwarnicki, T; Stoynowski, R; Artuso, M; He, D; Goldberg, M; Horwitz, N; Kennett, R; Moneti, G C; Muheim, F; Mukhin, Y; Playfer, S; Rozen, Y; Stone, S; Thulasidas, M; Vasseur, G; Zhu, G; Bartelt, J; Csorna, S E; Egyed, Z; Jain, V; Sheldon, P; Akerib, D S; Barish, B; Chadha, M; Chan, S; Cowen, D F; Eigen, G; Miller, J S; O'Grady, C; Urheim, J; Weinstein, A J; Acosta, D; Athanas, M; Masek, G

We observe the [Sigma][sub [ital c]][sup +] baryon decaying to [Lambda][sub [ital c]][sup +][pi][sup 0] and measure the mass difference [ital M]([Sigma][sub [ital c]][sup +])[minus][ital M]([Lambda][sub [ital c]][sup +]) to be 168.5[plus minus]0.2 MeV/[ital c][sup 2]. We also measure the mass differences [ital M]([Sigma][sub [ital c]][sup ++])[minus][ital M]([Lambda][sub [ital c]][sup +]) and [ital M]([Sigma][sub [ital c]][sup 0])[minus][ital M]([Lambda][sub [ital c]][sup +]) with improved precision and determine the isospin mass splittings [ital M]([Sigma][sub [ital c]][sup ++])[minus][ital M]([Sigma][sub [ital c]][sup 0]) and [ital M]([Sigma][sub [ital c]][sup +])[minus][ital M]([Sigma][sub [ital c]][sup 0]) to be 1.1[plus minus]0.4[plus minus]0.1 MeV/[ital c][sup 2] and 1.4[plus minus]0.5[plus minus]0.3 MeV/[ital c][sup 2], respectively. Our results indicate that the light quark mass difference does not dominate the isospin mass splitting in [Sigma][sub [ital c]].

• OSTI ID: 5432073
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 71:20; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

662310 -- Weak & Electromagnetic Interactions of Leptons-- (1992-)
662360 -- Decays of Baryons-- (1992-)
662390 -- Electromagnetic Processes & Properties-- (1992-)
662410* -- Properties of Baryons & Baryon Resonances-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
BOSONS
CHARM PARTICLES
CHARMED BARYONS
DECAY
ELEMENTARY PARTICLES
FERMIONS
HADRONS
ISOSPIN
LAMBDA C PLUS BARYONS
MASS DIFFERENCE
MESONS
PARTICLE DECAY
PARTICLE PROPERTIES
PIONS
PIONS NEUTRAL
PSEUDOSCALAR MESONS
SIGMA C-2450 BARYONS
WEAK HADRONIC DECAY
WEAK PARTICLE DECAY