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Search for production of heavy particles decaying to top quarks and invisible particles in pp̄ Collisions at √s=1.96TeV

  • T. Aaltonen
  • , B. Álvarez González
  • , S. Amerio
  • , D. Amidei
  • , A. Anastassov
  • , A. Annovi
  • , J. Antos
  • , G. Apollinari
  • , J. A. Appel
  • , A. Apresyan
  • , T. Arisawa
  • , A. Artikov
  • , J. Asaadi
  • , W. Ashmanskas
  • , B. Auerbach
  • , A. Aurisano
  • , F. Azfar
  • , W. Badgett
  • , A. Barbaro-Galtieri
  • , V. E. Barnes
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Yoshida, G. B. Yu, I. Yu, S. S. Yu, J. C. Yun, A. Zanetti, Y. Zeng, S. Zucchelli
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Research output: Contribution to journal › Article › peer-review

Abstract

We present a search for a new particle T′ decaying to top quark via T′→t+X, where X is an invisible particle. In a data sample with 4.8fb-1 of integrated luminosity collected by the CDF II detector at Fermilab in pp̄ collisions with √s=1.96TeV, we search for pair production of T′ in the lepton+jets channel, pp̄→tt̄+X+X→ νbqq′b+X+X. We interpret our results primarily in terms of a model where T′ are exotic fourth generation quarks and X are dark matter particles. Current direct and indirect bounds on such exotic quarks restrict their masses to be between 300 and 600GeV/c2, the dark matter particle mass being anywhere below Tm ′. The data are consistent with standard model expectations, and we set 95% confidence level limits on the generic production of T ′T̄′→tt̄+X+X. For the dark matter model we exclude T′ at 95% confidence level up to Tm′=360GeV/c2 for mX≤100GeV/c2.

Original languageEnglish
Article number191801
JournalPhysical Review Letters
Volume106
Issue number19
DOIs
StatePublished - 12 May 2011

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