Abbaneo, D
Ainsly, C
Alcaraz, J
Antilogus, P
Bajo-Vaquero, A
Bambade, P
Barberio, E
Blondel, A
Bouhova-Thacker, E
Blyth, S
Bourilkov, D
Checchia, P
Chierici, R
Clare, R
Van Dalen, J
De Bonis, I
de la Cruz, B
Dierckxsens, M
Duchesneau, D
Duckeck, G
Elsing, M
García-Abia, P
Grünewald, M W
Gurtu, A
Hansen, J B
Hawkings, R
Holt, J
Jézéquel, S
Jones, R W L
Kawamoto, T
Kersevan, Borut P
Kjaer, N J
Lançon, E
Malgeri, L
Mariotti, C
Martínez, M
Matorras, F
Matteuzzi, C
Mele, S
Migliore, E
Minard, M N
Mönig, K
Nowell, J
Parkes, C
Parzefall, U
Pepé-Altarelli, M
Pietrzyk, B
Quast, G
Renton, P B
Riemann, S
Sachs, K
Strässner, A
Strom, D
Tenchini, Roberto
Teubert, F
Todorova-Nová, S
Tournefier, E
Valassi, Andrea
Voss, H
Ward, C P
Watson, N K
Wynhoff, S
De Groot, N
Rowson, P C
Schumm, B
Su, D
A Combination of Preliminary Electroweak Measurements and Constraints on the Standard Model, 2002
his note presents a combination of published and preliminary electroweak results from the four LEP collaborations and the SLD collaboration which were prepared for the 2002 summer conferences. Averages from Z resonance results are derived for hadronic and leptonic cross sections, the leptonic forward-backward asymmetries, the tau polarisation asymmetries, the b-bbar and c-cbar partial widths and forward-backward asymmetries and the q-qbar charge asymmetry. Above the Z resonance, averages are derived for di-fermion cross sections and forward-backward asymmetries, photon-pair, W-pair, Z-pair single-W and single-Z cross sections, electroweak gauge boson couplings, W mass and width and W decay branching ratios. The main changes with respect to the experimental results presented in summer 2001 are updates to the Z-pole heavy flavour results from SLD and LEP, and new combinations of results above the Z pole. A new investigation of the interference of photon and Z-boson exchange is presented. For the first time, colour reconnection and Bose-Einstein correlation analyses in W-pair production are combined. The results are compared with precise electroweak measurements from other experiments, notably the recent final result on the electroweak mixing angle determined in neutrino-nucleon scattering by the NuTeV collaboration. The parameters of the Standard Model are evaluated, first using the combined LEP electroweak measurements, and then using the full set of electroweak results.
eng
2002
final version
http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=ep-2002-091;
http://cds.cern.ch/record/602720/files/ep-2002-091.pdf;
http://cds.cern.ch/record/602720/files/ep-2002-091.ps.gz;
Imported from Invenio.
Peccei, Roberto D
Electroweak interactions
The cross section of the process $\rm e^+e^-\rightarrow Ze^+e^-$ is measured with ~0.7\,fb$^{-1}$ of data collected with the L3 detector at LEP. Decays of the Z boson into quarks and muons are considered at centre-of-mass energies ranging from $183$ GeV up to $209$ GeV. The measurements are found to agree with Standard Model predictions, achieving a precision of about 10\% for the hadronic channel.
eng
Z decay into muon antimuon;
Z decay into quark antiquark;
cross section;
electron positron producing Z positron electron;
standard model;
2003
http://weblib.cern.ch/abstract?CERN-EP-2002-103;
http://cds.cern.ch/record/602713/files/arXiv:hep-ex_0303041.pdf;
http://cds.cern.ch/record/602713/files/Fig2b.png;
http://cds.cern.ch/record/602713/files/S0370269303004064.xml;
http://cds.cern.ch/record/602713/files/Fig4.png;
http://cds.cern.ch/record/602713/files/Fig2a.png;
http://cds.cern.ch/record/602713/files/Fig1.png;
http://cds.cern.ch/record/602713/files/Fig3b.png;
http://cds.cern.ch/record/602713/files/fig00000.png;
http://cds.cern.ch/record/602713/files/Fig3a.png;
http://cds.cern.ch/record/602713/files/ep-2002-103.pdf;
http://cds.cern.ch/record/602713/files/ep-2002-103.ps.gz;
Imported from Invenio.