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

  • T. Aaltonen
  • , A. Abulencia
  • , J. Adelman
  • , T. Affolder
  • , T. Akimoto
  • , M. G. Albrow
  • , S. Amerio
  • , D. Amidei
  • , A. Anastassov
  • , K. Anikeev
  • , A. Annovi
  • , J. Antos
  • , M. Aoki
  • , G. Apollinari
  • , T. Arisawa
  • , A. Artikov
  • , W. Ashmanskas
  • , A. Attal
  • , A. Aurisano
  • , F. Azfar
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Research output: Contribution to journalArticlepeer-review

45 Scopus citations

Abstract

We present the results of a search for new particles that lead to a Z boson plus jets in pp̄ collisions at s=1.96TeV using the Collider Detector at Fermilab (CDF II). A data sample with a luminosity of 1.06fb-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 tt̄ 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 268GeV/c2 are excluded at 95% confidence level.

Original languageEnglish
Article number072006
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume76
Issue number7
DOIs
StatePublished - 18 Oct 2007

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