Measurement of the polar-angle distribution of leptons fromWboson decay as a function of theWtransverse momentum inpp¯collisions ats=1.8TeV

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Abstract

We present a measurement of the polar-angle distribution of leptons from W boson decay, as a function of the W transverse momentum. The measurement uses an $80\ifmmode\pm\else\textpm\fi{}4{\mathrm{pb}}^{\ensuremath{-}1}$ sample of $p\overline{p}$ collisions at $\sqrt{s}=1.8\mathrm{TeV}$ collected by the CDF detector and includes data from both the $\stackrel{\ensuremath{\rightarrow}}{W}e+\ensuremath{\nu}$ and $\stackrel{\ensuremath{\rightarrow}}{W}\ensuremath{\mu}+\ensuremath{\nu}$ decay channels. We fit the W boson transverse mass distribution to a set of templates from a Monte Carlo event generator and detector simulation in several ranges of the W transverse momentum. The measurement agrees with the standard model expectation, whereby the ratio of longitudinally to transversely polarized W bosons, in the Collins-Soper W rest frame, increases with the W transverse momentum at a rate of approximately 15% per $10\mathrm{GeV}/c.$

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