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Phys. Rev. D 76, 072006 (2007) [24 pages]

Search for new particles leading to Z+jets final states in pp̅ collisions at s=1.96  TeV

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T. Aaltonen et al. CDF Collaboration
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Received 25 June 2007; published 18 October 2007

We present the results of a search for new particles that lead to a Z boson plus jets in pp̅ collisions at s=1.96  TeV using the Collider Detector at Fermilab (CDF II). A data sample with a luminosity of 1.06  fb-1 collected using Z boson decays to ee and μμ is used. We describe a completely data-based method to predict the dominant background from standard model Z+jet events. This method can be similarly applied to other analyses requiring background predictions in multijet environments, as shown when validating the method by predicting the background from W+jets in tt̅ production. No significant excess above the background prediction is observed, and a limit is set using a fourth generation quark model to quantify the acceptance. Assuming BR(bbZ)=100% and using a leading-order calculation of the b cross section, b quark masses below 268  GeV/c2 are excluded at 95% confidence level.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.76.072006
DOI:
10.1103/PhysRevD.76.072006
PACS:
13.85.Rm, 13.85.Qk, 14.70.Hp, 14.80.−j