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Persistent URL http://purl.org/net/epubs/work/29600
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Record Id 29600
Title Measurement of the Branching Ratio and the Form Factor of the Decay KL --> e+e- y
Abstract NA48 is a fixed target experiment situated in the North Area High Intensity Facility at CERN SPS. Its primary purpose is to study direct CP violation in the neutral kaon system. The experimental setup also allows the possibility of studying rare KL decays such as KL --> e+ e- photon. Using the data taken during the a six week run in September - October 1997 the form factor and branching ratio of the decay KL --> e+ e- photon have been determined. The form factor parameter alpha K* has been measured to be (-0.300 +bar 0.600 superscript +0.018 subscript -0.014) where the first error is statistical and the second systematic. The branching ratio (KL --> e+ e- photon)/(KL --> all) was measured to be (1.05 +bar 0.022 +bar 0.019 +bar 0.037 ) x 10 superscript -5, where the first error given is statistical, the second systematic and the third is due to uncertainties in the quantities used in normalisation. These results are in reasonable agreement with the predictions of the model of Bergstrom, Masso and Singer where contributions from both pi superscript 0, neu, neu prime pseudoscalar pole dominance and a KL --> K* photon transition followed by a non-leptonic K* --> rho, omega, phi transition are considered.
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Language English (EN)
Type Details URI(s) Local file(s) Year
Thesis RAL Theses RAL-TH-1999-007. 1999. 1999