Measurement of the polar-angle distribution of leptons from $W$ boson decay as a function of the W transverse momentum in $p\bar{p}$ collisions at $\sqrt{s} = 1.8$ TeV

We present a measurement of the coefficient alpha_2 of the leptonic polar-angle distribution from W boson decays, as a function of the W transverse momentum. The measurement uses an 80+/-4 pb^{-1} sample of proton-antiproton collisions at sqrt{s}=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.

Note:

47 pages, 16 figures, submitted to Physical Review D

12.15.Ji
13.38.Be
13.85.Qk
12.38.Qk
anti-p p: colliding beams
anti-p p: inclusive reaction
W: hadroproduction
W: leptonic decay
lepton: angular distribution
W: transverse momentum

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