Hyperon AND Hyperon Resonance Properties From Charm Baryon Decays At BaBar

Ziegler, Veronique ; /Iowa U.

关键词: ACCURACY;    AMPLITUDES;    BARYONS;    DALITZ PLOT;    DECAY;    HYPERONS;    HYPOTHESIS;    ISOBAR MODEL;    MASS DISTRIBUTION;    PARITY;    PRODUCTION;    RESONANCE;    SPIN Experiment-HEP;    HEPEX;   

DOI  :  10.2172/909548
RP-ID  :  SLAC-R-868
PID  :  OSTI ID: 909548
Others  :  TRN: US0703916

学科分类：物理（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

This report describes studies of hyperons and hyperon resonances produced in charm baryon decays at BABAR. Using two-body decays of the {Xi}{sub c}{sup 0} and {Omega}{sub c}{sup 0}, it is shown, for the first time, that the spin of the {omega}{sup -} is 3/2. The {Omega}{sup -} analysis procedures are extended to three-body final states and properties of the {Xi}(1690){sup 0} are extracted from a detailed isobar model analysis of the {Lambda}{sub c}{sup +} {yields} {Lambda}{bar K}{sup 0}K{sup +} Dalitz plot. The mass and width values of the {Xi}(1690){sup 0} are measured with much greater precision than attained previously. The hypothesis that the spin of the {Xi}(1690) resonance is 1/2 yields an excellent description of the data, while spin values 3/2 and 5/2 are disfavored. The {Lambda}a{sub 0}(980){sup +} decay mode of the {Lambda}{sub c}{sup +} is observed for the first time. Similar techniques are then used to study {Xi}(1530){sup 0} production in {Lambda}{sub c}{sup +} decay. The spin of the {Xi}(1530) is established for the first time to be 3/2. The existence of an S-wave amplitude in the {Xi}{sup -}{pi}{sup +} system is shown, and its interference with the {Xi}(1530){sup 0} amplitude provides the first clear demonstration of the Breit-Wigner phase motion expected for the {Xi}(1530). The {Xi}{sup -}{pi}{sup +} mass distribution in the vicinity of the {Xi}(1690){sup 0} exhibits interesting structure which may be interpreted as indicating that the {Xi}(1690) has negative parity.