We report the first observation of the associated production of a W boson and a Z boson. This result is based on 1.1fb-1 of integrated luminosity from pp̄ collisions at s=1.96TeV collected with the CDF II detector at the Fermilab Tevatron. We observe 16 WZ candidates passing our event selection with an expected background of 2.7±0.4 events. A fit to the missing transverse energy distribution indicates an excess of events compared to the background expectation corresponding to a significance equivalent to 6 standard deviations. The measured cross section is σ(pp̄→WZ)=5.0-1.6+1.8pb, consistent with the standard model expectation. © 2007 The American Physical Society.
Observation of WZ production
BISELLO, DARIO;BUSETTO, GIOVANNI;CORTIANA, GIORGIO;LUCCHESI, DONATELLA;ROSSIN, ROBERTO;
2007
Abstract
We report the first observation of the associated production of a W boson and a Z boson. This result is based on 1.1fb-1 of integrated luminosity from pp̄ collisions at s=1.96TeV collected with the CDF II detector at the Fermilab Tevatron. We observe 16 WZ candidates passing our event selection with an expected background of 2.7±0.4 events. A fit to the missing transverse energy distribution indicates an excess of events compared to the background expectation corresponding to a significance equivalent to 6 standard deviations. The measured cross section is σ(pp̄→WZ)=5.0-1.6+1.8pb, consistent with the standard model expectation. © 2007 The American Physical Society.
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