Search for new heavy particles decaying to ZZ→llll, lljj in pp̅ collisions at √s=1.96 [square root of s=1.96] TeV
Author(s)
Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Makhoul, Khaldoun; Paus, Christoph M. E.; Bauer, Gerry P
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We report on a search for anomalous production of Z boson pairs through a massive resonance decay in data corresponding to 2.5–2.9 fb-1 [fb superscript -1] of integrated luminosity in pp̅ collisions at √s=1.96 [square root of s=1.96] TeV using the CDF II detector at the Fermilab Tevatron. This analysis, with more data and channels where the Z bosons decay to muons or jets, supersedes the 1.1 fb-1 [fb superscript -1] four-electron channel result previously published by CDF. In order to maintain high efficiency for muons, we use a new forward tracking algorithm and muon identification requirements optimized for these high signal-to-background channels. Predicting the dominant backgrounds in each channel entirely from sideband data samples, we observe four-body invariant mass spectra above 300 GeV/c2 [GeV / c superscript 2] that are consistent with background. We set limits using the acceptance for a massive graviton resonance that are 7–20 times stronger than the previously published direct limits on resonant ZZ diboson production.
Date issued
2011-06Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
Physical review D
Publisher
American Physical Society
Citation
Aaltonen, T. et al. (CDF Collaboration) "Search for new heavy particles decaying to ZZ→llll, lljj in pp̅ collisions at √s=1.96 TeV" Phys. Rev. D 83, 112008 (2011) © 2011 American Physical Society
Version: Final published version
ISSN
1550-7998
1550-2368