Measurement of the azimuthal angle distribution of leptons from W boson decays as a function of the W transverse momentum in pp¯ collisions at s=1.8TeV

D. Acosta et al.
Phys. Rev. D 73, 052002 – Published 3 March 2006

Abstract

We present the first measurement of the A2 and A3 angular coefficients of the W boson produced in proton-antiproton collisions. We study Weνe and Wμνμ candidate events produced in association with at least one jet at CDF, during Run Ia and Run Ib of the Tevatron at s=1.8TeV. The corresponding integrated luminosity was 110pb1. 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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  • Received 2 April 2005

DOI:https://doi.org/10.1103/PhysRevD.73.052002

©2006 American Physical Society

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Vol. 73, Iss. 5 — 1 March 2006

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