Measurement of the polar-angle distribution of leptons from W boson decay as a function of the W transverse momentum in p(p)over-bar collisions at root s=1.8 TeV RID C-1693-2008 RID E-4473-2011

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doi:10.1103/PhysRevD.70.032004

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+/-4 pb(-1) sample of p (p) over bar collisions at roots=1.8 TeV collected by the CDF detector and includes data from both the W-->e+nu and W-->mu+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 GeV/c.