mu"+mu"-(gamma) and the Measurement of Trilinear Gauge Couplings at LEP2 Using the DELPHI Detector">

The Study of E"+e"-->mu"+mu"-(gamma) and the Measurement of Trilinear Gauge Couplings at LEP2 Using the DELPHI Detector
mu"+mu"-(gamma) and the Measurement of Trilinear Gauge Couplings at LEP2 Using the DELPHI Detector">The Study of Emu"+mu"-(gamma) and the Measurement of Trilinear Gauge Couplings at LEP2 Using the DELPHI Detector" style="border:3px solid;width:150px;height:100%">

Author: James Frederick Libby

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Published: 1999

Total Pages: 0

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Measurements of Trilinear Gauge Boson Couplings
Measurements of Trilinear Gauge Boson Couplings

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Publisher:

Published: 2003

Total Pages:

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Direct measurements of the trilinear gauge boson couplings by the D0 collaboration at Fermilab are reported. Limits on the anomalous couplings were obtained at a 95% CL from four diboson production processes: W[gamma] production with the W boson decaying to e[nu] or[mu][nu], WW production with both of the W bosons decaying to e[nu] or[mu][nu], WW/WZ production with one W boson decaying to e[nu] and the other W or Z boson decaying to two jets, and Z[gamma] production with the Z boson decaying to ee, [mu][mu], or[nu][nu]. Limits were also obtained from a combined fit to W[gamma], WW[yields] dileptons and WW/WZ[yields] e[nu]jj data samples.

Evidence for Exclusive $\gamma\gamma \to W^+ W^-$ Production and Constraints on Anomalous Quartic Gauge Couplings at $\sqrt{s}
Evidence for Exclusive $\gamma\gamma \to W^+ W^-$ Production and Constraints on Anomalous Quartic Gauge Couplings at $\sqrt{s}

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Published: 2016

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A search for exclusive or quasi-exclusive gamma-gamma to W+W- production, via pp to p(*) W+W- p(*) to p(*) mu+/- e-/+ at sqrt(s)=8 TeV, is reported using data corresponding to an integrated luminosity of 19.7 inverse femtobarns. Events are selected by requiring the presence of an electron-muon pair with large transverse momentum pt(mu+/- e-/+>) 30 GeV, and no associated charged particles detected from the same vertex. The 8 TeV results are combined with the previous 7 TeV results (obtained for 5.05 inverse femtobarns of data). In the signal region, 13 (2) events are observed over an expected background of 3.9 +/- 0.6 (0.84 +/-0.15) events for 8 (7) TeV, resulting in a combined excess of 3.4 sigma over the background-only hypothesis. The observed yields and kinematic distributions are compatible with the standard model prediction for exclusive and quasi-exclusive gamma-gamma to W+W- production. Upper limits on the anomalous quartic gauge coupling operators a[W;0,C] (dimension-6) and f[M0,1,2,3] (dimension-8), the most stringent to date, are derived from the measured dilepton transverse momentum spectrum.

Trilinear Gauge Couplings at the Fermilab Tevatron
Trilinear Gauge Couplings at the Fermilab Tevatron

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Published: 1997

Total Pages: 6

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Recent trilinear gauge boson couplings measurements by the CDF and D0 Collaborations at the Fermilab Tevatron are presented. The measurements were done by analyzing diboson production in multiple decay channels and final states. No deviations from the Standard Model description of the WWZ, WW[gamma], ZZ[gamma] and Z[gamma][gamma] vertices were found. Limits on anomalous gauge couplings set by these analyses are the tightest available to date.