Measurement of $W$ boson polarizations and CP violating triple gauge couplings from $W^{+} W^{-}$ production at LEP - INSPIRE

DataBETA

Measurement of $W$ boson polarizations and CP violating triple gauge couplings from $W^{+} W^{-}$ production at LEP

OPAL

Collaboration

•

G. Abbiendi

Aug, 2000

24 pages

Published in:

Eur.Phys.J.C 19 (2001) 229-240

e-Print:

hep-ex/0009021 [hep-ex]

DOI:

10.1007/s100520100602

PDG:

\mathit g{}^{{{\mathit Z}}}_{4}

Report number:

CERN-EP-2000-113

Experiments:

CERN-LEP-OPAL

View in:

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Abstract: (arXiv)

Measurements are presented of the polarisation of W+W- boson pairs produced in e+e- collisions, and of CP-violating WWZ and WWGamma trilinear gauge couplings. The data were recorded by the OPAL experiment at LEP during 1998, where a total integrated luminosity of 183 pb^-1 was obtained at a centre-of-mass energy of 189 GeV. The measurements are performed through a spin density matrix analysis of the W boson decay products. The fraction of W bosons produced with longitudinal polarisation was found to be sigma_L/sigma_total = (21.0 +- 3.3 +- 1.6)% where the first error is statistical and the second systematic. The joint W boson pair production fractions were found to be sigma_TT/sigma_total = (78.1 +- 9.0 +- 3.2) %, sigma_LL/sigma_total = (20.1 +- 7.2 +- 1.8) % and sigma_TL/sigma_total = (1.8 +- 14.7 +- 3.8) %. In the CP-violating trilinear gauge coupling sector we find kappa_z = -0.20 +0.10 -0.07, g^z_4 = -0.02 +0.32 -0.33 and lambda_z = -0.18 +0.24 -0.16, where errors include both statistical and systematic uncertainties. In each case the coupling is determined with all other couplings set to their Standard Model values except those related to the measured coupling via SU(2)_LxU(1)_Y symmetry. These results are consistent with Standard Model expectations.

electron positron: colliding beams
electron positron: annihilation
W: pair production
W: polarization
polarization: longitudinal
polarization: transverse
coupling: (3gauge boson)
W: hadronic decay
W: leptonic decay
spin: density matrix

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