Polarization Asymmetries in Gamma E Collisions and Triple Gauge Boson Couplings Revisited
Polarization Asymmetries in Gamma E Collisions and Triple Gauge Boson Couplings Revisited

Author:

Publisher:

Published: 1999

Total Pages: 5

ISBN-13:

DOWNLOAD EBOOK

The capability of the NLC run in the [gamma]e collision mode to probe the CP-conserving [gamma]WW and [gamma]ZZ anomalous couplings through the use of the polarization asymmetry is reviewed. When combined with other measurements, very strong constraints on both varieties of anomalous couplings can be obtained. We show that these bounds are complementary to those that can be extracted from data taken at the LHC.

Measurement of the $W^+W^-$ Production Cross Section and Search for Anomalous $WW\gamma$ and $WWZ$ Couplings in $p \bar P$ Collisions at $\sqrt{s}
Measurement of the $W^+W^-$ Production Cross Section and Search for Anomalous $WW\gamma$ and $WWZ$ Couplings in $p \bar P$ Collisions at $\sqrt{s}

Author:

Publisher:

Published: 2009

Total Pages:

ISBN-13:

DOWNLOAD EBOOK

This Letter describes the current most precise measurement of the W boson pair production cross section and most sensitive test of anomalous WW[gamma] and WWZ couplings in p{bar p} collisions at a center-of-mass energy of 1.96 TeV. The WW candidates are reconstructed from decays containing two charged leptons and two neutrinos, where the charged leptons are either electrons or muons. Using data collected by the CDF II detector from 3.6 fb−1 of integrated luminosity, a total of 654 candidate events are observed with an expected background contribution of 320 ± 47 events. The measured total cross section is [sigma](p{bar p} 2!WW− + X) = 12.1 ± 0.9 (stat){sub -1.4}{sup +1.6} (syst) pb, which is in good agreement with the standard model prediction. The same data sample is used to place constraints on anomalous WW[gamma] and WWZ couplings.

The Polarization Asymmetry in [gamma]e Collisions at the NLC and Triple Gauge Boson Couplings
The Polarization Asymmetry in [gamma]e Collisions at the NLC and Triple Gauge Boson Couplings

Author:

Publisher:

Published: 1996

Total Pages: 11

ISBN-13:

DOWNLOAD EBOOK

The capability of the NLC in the [gamma]e collider mode to probe the CP-conserving [gamma]WW and [gamma]ZZ anomalous couplings through the use of the polarization asymmetry is examined. When combined with other measurements, very strong constraints on both varieties of anomalous couplings can be obtained. The author shows that these bounds are complementary to those that can be extracted from data taken at the LHC.

Measurement of W-gamma and Z-gamma Production in Pp Collisions at Sqrt(s)
Measurement of W-gamma and Z-gamma Production in Pp Collisions at Sqrt(s)

Author:

Publisher:

Published: 2011

Total Pages: 32

ISBN-13:

DOWNLOAD EBOOK

A measurement of W-gamma and Z-gamma production in proton-proton collisions at sqrt(s) = 7 TeV is presented. Results are based on a data sample recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 36 inverse picobarns. The electron and muon decay channels of the W and Z are used. The total cross sections are measured for photon transverse energy>10 GeV and spatial separation from charged leptons in the plane of pseudorapidity and azimuthal angle>0.7, and with an additional dilepton invariant mass requirement of> 50 GeV for the Z-gamma process. The following cross section times branching fraction values are found: sigma(pp to W-gamma+X) B(W to lepton neutrino) = 56.3 +/- 5.0 (stat.) +/- 5.0 (syst.) +/- 2.3 (lumi.) pb and sigma(pp to Z-gamma+X) B}(Z to lepton lepton) = 9.4 +/- 1.0 (stat.) +/- 0.6 (syst.) +/- 0.4 (lumi.) pb. These measurements are in agreement with standard model predictions. The first limits on anomalous WW gamma, ZZ gamma, and Z gamma gamma trilinear gauge couplings at sqrt(s) = 7 TeV are set.