Research Papers in Physics and Astronomy


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Published by American Physical Society. Phys. Rev. D 73, 052002 (2006). Copyright © 2006 American Physical Society. Permission to use.


We present the first measurement of the A2 and A3 angular coefficients of the W boson produced in proton-antiproton collisions. We study We νe and We νe candidate events produced in association with at least one jet at CDF, during Run Ia and Run Ib of the Tevatron at √s =1:8 TeV. The corresponding integrated luminosity was 110 pb-1. The jet balances the transverse momentum of the W and introduces QCD effects in W boson production. The extraction of the angular coefficients is achieved through the direct measurement of the azimuthal angle of the charged lepton in the Collins-Soper rest-frame of the W boson. The angular coefficients are measured as a function of the transverse momentum of the W boson. The electron, muon, and combined results are in good agreement with the standard model prediction, up to order αs2 in QCD.

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