Padley, B. Paul2018-12-032018-12-032007Pawloski, Gregory J.. "The study of W γ production at DØ: Anomalous coupling limits and the radiation amplitude zero." (2007) Diss., Rice University. <a href="https://hdl.handle.net/1911/103664">https://hdl.handle.net/1911/103664</a>.https://hdl.handle.net/1911/103664W γ production is analyzed in the electron and muon decay channels with approximately 1 fb –1 of data from pp collisions that were produced at a center-of-mass energy of [special characters omitted] = 1.96 TeV and that were collected by the D∅ detector at the Fermilab Tevatron collider. The inclusive p p → ℓνγ cross section is measured in both channels and is found to be consistent with the Standard Model expectation of 2.08 ± 0.05 PDF pb for events with a photon E T > 11 GeV , Δ R ℓγ > 0.7, and ℓνγ transverse mass greater than 90 GeV . The observed cross section is measured to be 2.05 ± 0.18 stat ± 0.10 sys ± 0.13 lumi pb and 1.72 ± 0.19 stat ± 0.15 sys ± 0.10 lumi pb for the electron and muon channels respectively. The photon E T spectrum is examined for indications of anomalous WW γ couplings. No evidence is found, and the following one-dimensional limits are set at a 95% confidence level: –0.18 The observed charge-signed photon-lepton rapidity difference is consistent with the Standard Model prediction and is indicative of the theoretically expected radiation amplitude zero. The distribution exhibits a bimodal structure which is expected from the destructive interference, with the unimodal hypothesis being ruled out at the 94% confidence level.294 ppengCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.Particle physicsPure sciencesAnomalous couplingRadiation amplitudeW bosonsThesis304817459THESIS PHYS. 2008 PAWLOSKI