This thesis is a study of the photoproduction of light and charmed-anticharmed mesons, using data collected by the FOCUS experiment. FOCUS is a fixed target photoproduction experiment at Fermi National Accelerator Laboratory (Fermi-lab), that collected data during 1996-1997. The experiment had a dimuon trigger which allowed us to obtain a very large sample of dimuon events.
The first analysis focuses on the study of the low mass vector mesons ρ, ω and &phis;, and provides the first high statistics measurement of the ρ – &phis; and ρ – ω interference phases using muons. Attempts to determine such parameters, necessary for a better understanding of the production mechanisms of these vector mesons, date back to the end of the '60's, but a consistent analysis using leptonic final states ( e+e− or μ +μ−) is still missing. Our results are: [special characters omitted]
Our second analysis studies the ψ' charmonium state and determines its branching fraction (BF) into the μ+μ− decay channel. The technique used to extract the BFψ'→μ +μ− consists of measuring the yield of the ψ' → μ+μ− decay (Y2b) relative to the yield of ψ' → J/ψπ+π −, where the J/ψ decays in μ +μ− (Y4 b). Fitting the ψ' peak in the μ+μ − and μ+μ− π +π− mass plots, we report signal event yields of Y2b = 563 ± 35 and Y4b = 1262 ± 39. These measurements allow us to evaluate the ψ' branching fraction as: [special characters omitted] This result significantly improves the precision of the world average value.
|Advisor:||Cumalat, John P.|
|Commitee:||Marino, Alysia D., Snow, Theodore P., Stenson, Kevin M., de Alwis, Senarath P.|
|School:||University of Colorado at Boulder|
|School Location:||United States -- Colorado|
|Source:||DAI-B 71/06, Dissertation Abstracts International|
|Keywords:||Branching fraction, Interference effects, Muons, Psi mesons, Vector mesons|
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