Measurement of the Angular Distribution of Electrons from W → eν Decays Observed in pp̄ Collisions at √ s = 1 . 8 TeV
نویسندگان
چکیده
We present the first measurement of the electron angular distribution parameter α2 in W → eν events produced in proton-antiproton collisions as a function of the W boson transverse momentum. Our analysis is based on data collected using the DØ detector during the 1994–1995 Fermilab Tevatron run. We compare our results with next-to-leading order perturbative QCD, which predicts an angular distribution of (1±α1 cosθ∗ + α2 cos2θ∗), where θ∗ is the polar angle of the electron in the Collins-Soper frame. In the presence of QCD corrections, the parameters α1 and α2 become functions of pT , the W boson transverse momentum. This measurement provides a test of nextto-leading order QCD corrections which are a non-negligible contribution to the W boson mass measurement.
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