Measurement of the azimuthal angle distribution of leptons fromW boson decays as a function of the W transverse momentum in pp̅ collisions at √s = 1.8 TeV

Authors

Darin Acosta, University of FloridaFollow
Kenneth A. Bloom, University of Nebraska-LincolnFollow
Fermilab Collaboration

Date of this Version

3-1-2006

Comments

Published by American Physical Society. Phys. Rev. D 73, 052002 (2006). http://prd.aps.org. Copyright © 2006 American Physical Society. Permission to use.

Abstract

We present the first measurement of the A₂ and A₃ angular coefficients of the W boson produced in proton-antiproton collisions. We study W → e ν_e and W → e ν_e 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 α_s² in QCD.