The Study of Wγ production at D0: Anomalous Coupling Limits and the Radiation Amplitude Zero
- Rice Univ., Houston, TX (United States)
Wγ production is analyzed in the electron and muon decay channels with approximately 1 fb-1 of data from p$$\bar{p}$$ collisions that were produced at a center-of-mass energy of √s = 1.96 TeV and that were collected by the D0 detector at the Fermilab Tevatron collider. The inclusive p$$\bar{p}$$ → ℓvγ cross section is measured in both channels and is found to be consistent with the Standard Model expectation of 2.08 ± 0.05PDF pb for events with a photon ET > 11 GeV, ΔRℓγ > 0.7, and ℓvγ transverse mass greater than 90 GeV . The observed cross section is measured to be 2.05 ± 0.18stat ± 0.10sys ± 0.13lumi pb and a.72 ± 0.19stat ± 0.15sys ± 0.10lumi pb for the electron and muon channels respectively. The photon ET spectrum is examined for indications of anomalous WWγ couplings. No evidence is found, and the following one-dimensional limits are set at a 95% confidence level: -0.18 < λ < 0.18 and 0.16 < κ < 1.84. 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.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 922036
- Report Number(s):
- FERMILAB-THESIS-2007-44; TRN: US0801096
- Country of Publication:
- United States
- Language:
- English
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