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

CollaborationWith : Campanelli, Mario / Clark, Allan Geoffrey / Hamilton, Andrew / Lefevre, Régis / Moed, Shulamit / Sfyrla, Anna / Shreyber, Irina / Vallecorsa, Sofia / Wu, Xin
Published in Physical Review. D. 2007, vol. 76, no. 07, p. 072006
Abstract We present the results of a search for new particles that lead to a Z boson plus jets in pp 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 tt 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(b′→bZ)=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.
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CDF COLLABORATION. Search for new particles leading to Z + jets final states in pp collisions at s√=1.96  TeV. In: Physical Review. D, 2007, vol. 76, n° 07, p. 072006. https://archive-ouverte.unige.ch/unige:38440

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Deposited on : 2014-07-03

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