An Investigation of the Neutral Cascade Muon Semileptonic Decay and its Observation at KTeV, Fermilab

Thesis/Dissertation · Fri Jul 01 00:00:00 EDT 2005

DOI:https://doi.org/10.2172/878927· OSTI ID:878927

Gomes, Ricardo Avelino ^[1]

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1. Univ. of Campinas (UNICAMP), Sao Paulo (Brazil)

The authors report an investigation of the semileptonic decay Ξ⁰ → Σ⁺ μ^-$$\bar{v}$$_μ. This decay was observed for the first time with nine identified events using the KTeV beam line and detector at Fermilab. The decay is normalized to the Ξ⁰ beta decay mode and yields a value for the ratio of decay rates Γ(Ξ⁰ → Σ⁰ μ^-$$\bar{v}$$_μ)/Γ(Ξ⁰ → Σ⁺e^-$$\bar{v}$$_e) of (1.8$$+0.7\atop{-0.5}$$(stat.) ± 0.2(syst.)) x 10^-0 at the 68.27% confidence level, being the official measurement of KTeV Collaboration. They also used the dominant decay Ξ⁰ → Γπ⁰(Γ → pπ^-) as normalization mode in an independent analysis which corroborated with the main result. In addition, a new measurement of the Ξ⁰ → Σ⁺ e^-$$\bar{v}$$_e branching ratio is presented, based on 1139 events and normalized to the Ξ⁰ → Γπ⁰(Γ → pπ^-) decay mode. The results are in agreement with the SU(3) flavor symmetric quark model.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76CH03000
• OSTI ID: 878927
• Report Number(s): FERMILAB-THESIS-2005-62; TRN: US0604975
• Country of Publication: United States
• Language: Portuguese

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BETA DECAY
BRANCHING RATIO
DECAY
FERMILAB
MUONS
QUARK MODEL
SEMILEPTONIC DECAY
Experiment-HEP