Measurement of the differential angular distribution of the W boson produced in association with jets in proton-antiproton collisions at sqrt (s)= 1.8 TeV
Strologas, John
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https://hdl.handle.net/2142/30824
Description
Title
Measurement of the differential angular distribution of the W boson produced in association with jets in proton-antiproton collisions at sqrt (s)= 1.8 TeV
Measurement of the differential angular distribution of the W boson produced in association with jets in proton-antiproton collisions at squareroot (s)= 1.8 TeV
Author(s)
Strologas, John
Issue Date
2002
Director of Research (if dissertation) or Advisor (if thesis)
Errede, Steven M.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
transverse momentum
bosons
particle physics
W boson
proton-antiproton collisions
Language
en
Abstract
The full differential cross section of the W boson produced in a proton-antiproton
collider can be written as a sum of nine terms. Each term is a product of an analytical
expression of the azimuthal and polar angles (cp and 0) of the charged lepton from the
W decay measured in the W-rest frame (leptonic part) times a helicity cross section
(hadronic part). By dividing the helicity cross sections by the full unpolarized cross
section we end up with eight angular coefficients (A0 - A7), which describe theW decay
distribution. At low W transverse momentum, only one of the angular coefficients is
non-zero. In order to study all the coefficients, we need to study the production of
the W at high transverse momentum, in association with the production of jets that
balance this transverse momentum.
In this thesis we present the first measurement of the A2 and A3 angular coefficients,
for four ranges of the W transverse momentum p}f. We performed the analysis
on CDF Run Ia and Run Ib W --+ eve data (integrated luminosity of 110 pb-1
) and
W -> uvu data (integrated luminosity of 107 pb-1) with the requirement for the existence
of at least one jet passing the CDF jet requirements. We directly measure the
cp angle of the charged lepton in the Collins-Soper W rest-frame. In this frame, cp is
exactly known, in spite of our ignorance of the longitudinal momentum of the decay
neutrino. Moreover, theW-mass systematic uncertainty on the measured azimuthal
angle is negligible. We extract measurements for the electron and muon channel W
decays, and the statistical combination of the two.
We also present the Standard Model prediction for the W angular coefficients Ai
as a function of p}f, using a W +jet Monte Carlo event generator, which includes
gluon loops. The prediction for three of the angular coefficients (A1 , A4 and A6 ) is
presented for the first time.
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