First Evidence of WW/WZ ---> l nu qq at the Tevatron Page: 1 of 7
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FIRST EVIDENCE OF WW/WZ - tivqq AT THE TEVATRON
(For the DO Collaboration)
Princeton University Department of Physics
Princeton, NJ, USA
We present the first evidence from a hadron collider of WW + WZ production with semi-
leptonic decays. The data were recorded by the DO detector at the Fermilab Tevatron and
correspond to 1.07 fb-i of integrated luminosity obtained in proton-antiproton collisions at
=1.96 TeV. The cross section observed for WW + WZ production is 20.2 + 4.5 pb with a
significance of 4.4 standard deviations.
There are many reasons for studying WW/WZ - tvqg at the Tevatron. From the electroweak
prospective, diboson production provides a probe of self-interactions of vector bosons. Deviations
from the Standard Model (SM) of these trilinear gauge boson coupling would affect the cross
sections and event kinematics of diboson production 1. The cross sections for diboson production
at the Tevatron had previously only been measured for the fully leptonic final states 2,3, so this
analysis provides a compliment to the previous measurements.
Reconstruction of WW and WZ events in semi-leptonic final states represents a challenge
in separating signal from the dominant background of a W boson produced in association with
jets. This is a challenge shared by many Higgs boson searches, e.g. WH - tvbb, making this
measurement a benchmark for these similar Higgs boson searches. Furthermore, this analysis
provides a proving ground for the multivariate event-classification schemes and the accompanying
statistical techniques 4 that are used for the Tevatron Higgs boson searches in the entire mass
range allowed by the SM.
2 Event Selection
To select candidate events for pp - WW/WZ - tvqq, we required a single reconstructed lepton
(electron or muon) s with transverse momentum pT > 20 GeV and iry < 1.1 (for electrons) or
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Haley, Joseph & U., /Princeton. First Evidence of WW/WZ ---> l nu qq at the Tevatron, article, July 1, 2009; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc928134/m1/1/: accessed August 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.