Measuring the W angular coefficients using the polar angle of the charged lepton from the decay of the W in association with a jet up to order a_s^2, in pbarp collisions at √s=1.8 TeV.

Details Measuring the W angular coefficients using the polar angle of the charged lepton from the decay of the W in association with a jet up to order a_s^2, in pbarp collisions at √s=1.8 TeV. Measuring the W angular coefficients using the polar angle of the charged lepton from the decay of the W in association with a jet up to order a_s^2, in pbarp collisions at √s=1.8 TeV.

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apre15007s&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

We present the measurement of two W angular coefficients using the polar angle analysis of the charged lepton from the decay of the W in association with a jet up to order a_s^2, in pbarp collisions at √s=1.8 TeV. There are 8 angular coefficients fully describing the W boson differential cross section and its distribution in space. These angular coefficients are ratios of the W helicity cross sections and its unpolarized cross section and they are functions of the W rapidity and transverse momentum (p_T). If the W is produced without any considerable p_T, its spin is parallel to the z-axis, due to helicity conservation, and only one angular coefficient is non-zero. Four of the coefficients are present when the W is produced with significant pT (guaranteed by the presence of a high pT jet), while the last three coefficients are present only if we have a gluon loop in the W production Feynman diagrams, suggesting the study of the W production at next-to-leading order in QCD. We show that only two leading order coefficients are statistically measurable using the polar angle analysis and Run I CDF data. These coefficients are linearly related to the β1 and β2 coefficients that completely describe the leading order Standard Model prediction for the polar angle distribution of the charged lepton from W decays (dσ/(dp_T^W dφ) = 1+ β1 \cosφ + β2 \cos2φ). We measure them as a function of the W transverse momentum, using electron and muon data and we also combine the two results.

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