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Search for ZZ and z gamma* production in p(p)over-bar collisions at root s=1.96 TeV and limits on anomalous ZZZ and ZZ gamma* couplings
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University.
Stockholm University.
Stockholm University.
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2008 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 100, no 13, 131801- p.Article in journal (Refereed) Published
Abstract [en]

We present a study of mu mu mu mu, eeee, and mu mu ee events using 1 fb(-1) of data collected with the D0 detector at the Fermilab Tevatron p (p) over bar Collider at root s = 1.96 TeV. Requiring the lepton pair masses to be greater than 30 GeV, we observe one event, consistent with the expected background of 0.13 +/- 0.03 events and with the predicted standard model ZZ and Z gamma(*) production of 1.71 +/- 0.15 events. We set an upper limit on the ZZ and Z gamma(*) cross section of 4.4 pb at the 95% C.L. We also derive limits on anomalous neutral trilinear ZZZ and ZZ gamma(*) gauge couplings. The one-parameter 95% C.L. coupling limits with a form-factor scale Lambda = 1.2 TeV are -0.28 < f(40)(Z)< 0.28, -0.31 < f(50)(Z)< 0.29, -0.26 < f(40)(gamma)< 0.26, and -0.30 < f(50)(gamma)< 0.28.

Place, publisher, year, edition, pages
2008. Vol. 100, no 13, 131801- p.
National Category
Physical Sciences
URN: urn:nbn:se:su:diva-58583DOI: 10.1103/PhysRevLett.100.131801ISI: 000254670300015OAI: diva2:424867
authorCount :548Available from: 2011-06-20 Created: 2011-06-03 Last updated: 2011-06-20Bibliographically approved

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Åsman, Barbro
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