Title
Strong evidence for ZZ production in <tex>$p\overline{p}$</tex> collisions at <tex>$\sqrt{s}$</tex>=1.96 TeV Strong evidence for ZZ production in <tex>$p\overline{p}$</tex> collisions at <tex>$\sqrt{s}$</tex>=1.96 TeV
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
New York, N.Y. ,
Subject
Physics
Source (journal)
Physical review letters. - New York, N.Y.
Volume/pages
100(2008) :20 , p. 201801,1-201801,7
ISSN
0031-9007
ISI
000256206400015
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
We report the first evidence of Z boson pair production at a hadron collider with a significance exceeding 4 standard deviations. This result is based on a data sample corresponding to 1.9  fb-1 of integrated luminosity from pp&#773; collisions at √s=1.96  TeV collected with the Collider Detector at Fermilab II detector. In the &#8467;&#8467;&#8467;′&#8467;′ channel, we observe three ZZ candidates with an expected background of 0.096-0.063+0.092 events. In the &#8467;&#8467;νν channel, we use a leading-order calculation of the relative ZZ and WW event probabilities to discriminate between signal and background. In the combination of &#8467;&#8467;&#8467;′&#8467;′ and &#8467;&#8467;νν channels, we observe an excess of events with a probability of 5.1×10-6 to be due to the expected background. This corresponds to a significance of 4.4 standard deviations. The measured cross section is σ(pp&#773; →ZZ)=1.4-0.6+0.7(stat+syst)  pb, consistent with the standard model expectation.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/a6b73e/66f07e64.pdf
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