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Title: Measurement of the branching ratio and form factor parameters of the decay KL → m+m-g
Author: Bevan, A. J.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2001
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Data from the 1998 run of the fixed target experiment NA48, located in the high intensity region of CERN's North Area, has been used to measure the branching ratio of KLμ+ μ- γ. In addition to this, form factor parameters for a vector meson dominance models proposed by Bergstrom et. al. (BMS), D'Ambrosio et. al (API) and that of Chiral Perturbation Theory (χPT) have been measured for this mode. A total of 1150 μμγ candidates was observed with an estimated background of 13.2±6.2 events. The branching ratio BR(KLμ+ μ- γ) was measured to be (4.00±0.12±0.7±0.7)x 10-7 where the first error is statistical, the second is systematic and the third error comes from the uncertainty in the knowledge of the branching ratio of normalization mode, KLπ+ π-. The BMS model form factor parameter, αK*, is measured to be -0.20±0.05. The χPT form factor parameters, αMK and α1.0 are measured to be 0.90±0.08 and 3.55±0.30 respectively. The measured value of the API model form factor parameter is αAPI = -1.71±0.16. From this one can calculate a lower bound of -0.39 (90% CL) on the Wolfenstein CKM matrix parameter ρ.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available