Measurement of the azimuthal angle distribution of leptons fromWboson decays as a function of theWtransverse momentum inpp¯collisions ats=1.8 TeV

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Abstract

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 $W\ensuremath{\rightarrow}e{\ensuremath{\nu}}_{e}$ and $W\ensuremath{\rightarrow}\ensuremath{\mu}{\ensuremath{\nu}}_{\ensuremath{\mu}}$ candidate events produced in association with at least one jet at CDF, during Run Ia and Run Ib of the Tevatron at $\sqrt{s}=1.8\text{ }\text{ }\mathrm{TeV}$. The corresponding integrated luminosity was $110\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$. 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 ${\ensuremath{\alpha}}_{s}^{2}$ in QCD.

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