Studies of Gauge Boson Pair Production and Trilinear Couplings

TL;DR

This paper investigates gauge boson pair production processes at high energy collisions, analyzing data to set limits on anomalous couplings and improve understanding of electroweak interactions.

Contribution

It provides new experimental limits on anomalous WWg, WWZ, ZZg, and Zgg couplings using data from pbarp collisions at 1.8 TeV.

Findings

Limits on anomalous WWg couplings from photon pT spectrum

Upper bounds on WW production cross section and couplings

Constraints on ZZg and Zgg couplings from Z boson decay channels

Abstract

The gauge boson pair production processes Wg, WW, WZ, and Zg were studied using pbarp collisions corresponding to an integrated luminosity of ~14 pb-1 at a center-of-mass energy of sqrt(s) = 1.8 TeV. Analysis of Wg prod with subsequent W boson decay to lv (l=e,mu) is reported, including a fit to the pT spectrum of the photons which leads to limits on anomalous WWg couplings. A search for WW prod with subsequent decay to l-lbar-v-vbar (l=e,mu) is presented leading to an upper limit on the WW prod cross section and limits on anomalous WWg and WWZ couplings. A search for high pT W bosons in WW and WZ prod is described, where one W boson decays to an ev and the second W boson or the Z boson decays to two jets. A maximum likelihood fit to the pT spectrum of W bosons resulted in limits on anomalous WWg and WWZ couplings. A combined fit to the three data sets which provided the tightest limits on anomalous WWg and WWZ couplings is also described. Limits on anomalous ZZg and Zgg couplings are presented from an analysis of the photon ET spectrum in Zg events in the decay channels (ee, mu-mu, and v-vbar) of the Z boson.