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Charmed baryon [Lambda][sub c] and [Sigma][sub c] production at [radical]s = 10 GeV and their decays

Thesis/Dissertation ·
OSTI ID:5638364
This thesis reports on the first observation with statistical significance of the isospin 1 singly charmed baryon [Sigma][sub c][sup +] in nonresonant e[sup +]e[sup [minus]] annihilation around [radical]s = 10.5 GeV through its decay to [Lambda][sub c][sup +][pi][sup 0]. The complete mass splittings between the isospin triplet states [Sigma][sub c] have been measured for the first time and compared with the theoretical predictions. The mass differences M([Sigma][sup +][sub c]) - M([Sigma][sup 0][sub c]) and M([Sigma][sub c][sup ++]) - M([Sigma][sup 0][sub c]) are determined to be 1.1 [+-] 0.6 [+-] 0.5 MeV/c[sup 2] and 0.9 [+-] 0.4 [+-] 0.2 MeV/c[sup 2], respectively. The author presents the observation of the unambiguous non-spectator decay [Lambda][sup +][sub c] [yields] [Sigma][sup +]K[sup +]K[sup [minus]]. It is the first time that a strong evidence is shown for the existence of a different decay mechanism in charm decays. Many new [Lambda][sup +][sub c] decay modes which have neutrals in their final states have been observed and reported. For some of the modes, the relative branching ratios are presented. Combining the measurements of these modes and the modes previously observed, the author has accounted 25 [+-] 5% of the total [Lambda][sub c][sup +] decay rates. The implications of these observations and measurements are discussed.
Research Organization:
State Univ. of New York, Albany, NY (United States)
OSTI ID:
5638364
Country of Publication:
United States
Language:
English

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Related Subjects

662360* -- Decays of Baryons-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BARYON-BARYON INTERACTIONS
BARYONS
BASIC INTERACTIONS
BOSONS
BRANCHING RATIO
CHARM PARTICLES
CHARMED BARYONS
DECAY
ELECTROMAGNETIC INTERACTIONS
ELECTRONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
GEV RANGE
GEV RANGE 10-100
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
ISOSPIN
LAMBDA C PLUS BARYONS
LEPTONS
MATTER
MESONS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PIONS
PIONS NEUTRAL
POSITRONS
PSEUDOSCALAR MESONS