Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2005-04-12
Phys.Rev.D73:052002,2006
Physics
High Energy Physics
High Energy Physics - Experiment
28 pages, 33 figures, submitted to Phys. Rev. D
Scientific paper
10.1103/PhysRevD.73.052002
We present the first measurement of the A_2 and A_3 angular coefficients of the W boson produced in proton-antiproton collisions. We study W-> e+nu and W-> mu+nu candidate events produced in association with at least one jet at CDF, during Run Ia and Run Ib of the Tevatron at sqrt(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 alpha_s^2 in QCD.
Acosta Darin
CDF collaboration for the
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