First Observation of Diboson Production in Hadronic Final State at the Tevatron

TL;DR

This paper reports the first observation of electroweak diboson production in hadronic final states at the Tevatron, using novel background suppression techniques and measuring a cross section consistent with the Standard Model.

Contribution

It introduces new analysis techniques for detecting diboson production in hadronic collisions and provides the first experimental evidence of this process in such final states.

Findings

Observed 1516 +/- 239 diboson candidate events

Measured cross section of 18.0 +/- 2.8(stat) +/- 2.4(syst) +/- 1.1(lumi) pb

Results agree with Standard Model predictions

Abstract

We present the first observation in hadronic collisions of the electroweak production of vector boson pairs (VV; V = W,Z) where one boson decays to a hadronic final state. The data correspond to 3.5/fb of integrated luminosity collected by the CDF II detector in p-pbar collisions at a center-of-mass energy of 1.96 TeV. Event selection requires two identified jets and large transverse momentum imbalance. The analysis employs several novel techniques to suppress multijet background and reduce systematic uncertainties. We observe 1516 +/- 239(stat) +/- 144(syst) diboson candidate events and measure a cross section of sigma(ppbar to VV+X) = 18.0 +/- 2.8(stat) +/- 2.4(syst) +/- 1.1(lumi) pb, in agreement with standard model expectations.