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Measurement of the angular distribution of electrons from W⃗ eν decays observed in pp-bar collisions at s√=1.8 TeV
Baringer, Philip S. Bean, Alice Coppage, Don Hebert, C. Abbott, B. Abolins, M. Abramov, V. Acharya, B. S. Adams, D. L. Adams, M.
Baringer, Philip S.
Bean, Alice
Coppage, Don
Hebert, C.
Abbott, B.
Abolins, M.
Abramov, V.
Acharya, B. S.
Adams, D. L.
Adams, M.
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Abstract
We present the first measurement of the electron angular distribution parameter α(2) in W⃗ eν events produced in proton-antiproton collisions as a function of the W boson transverse momentum. Our analysis is based on data collected using the DØ detector during the 1994–1995 Fermilab Tevatron run. We compare our results with next-to-leading order perturbative QCD, which predicts an angular distribution of (1±α(1c)osθ*+α(2)cos(2)θ*), where θ* is the polar angle of the electron in the Collins-Soper frame. In the presence of QCD corrections, the parameters α(1) and α(2) become functions of pWT, the W boson transverse momentum. This measurement provides a test of next-to-leading order QCD corrections which are a non-negligible contribution to the W boson mass measurement.
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This is the publisher's version, also available electronically from http://journals.aps.org/prd/abstract/10.1103/PhysRevD.63.072001.
Date
2001-03-05
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American Physical Society
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Baringer_3-5-2001.pdf
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B. Abbott et al. ((DØ Collaboration)). (2001). "Measurement of the angular distribution of electrons from W⃗ eν decays observed in pp-bar collisions at s√=1.8 TeV." Physical Review D, 63(7):072001. http://dx.doi.org/10.1103/PhysRevD.63.072001