Search for Production of Heavy Particles Decaying to Top Quarks and Invisible Particles in pp[over-bar] Collisions at [sqrt]s=1.96 TeV
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Aaltonen-2011-Search for Productio.pdf
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Author(s)
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Makhoul, Khaldoun
Paus, Christoph M. E.
Bauer, Gerry P
Alternative Title
Search for Production of Heavy Particles Decaying to Top Quarks and Invisible Particles in pp̅ Collisions at √s=1.96 TeV
Date Issued
May 2011
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
T. Aaltonen et al. (CDF Collaboration)."Search for Production of Heavy Particles Decaying to Top Quarks and Invisible Particles in pp[over-bar] Collisions at [sqrt]s=1.96 TeV." Phys. Rev. Lett. 106, 191801 (2011) [7 pages] © 2011 American Physical Society.
Version
Final published version
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 4.8 fb[superscript -1] of integrated luminosity collected by the CDF II detector at Fermilab in pp[over-bar] collisions with [sqrt]s=1.96 TeV, we search for pair production of T′ in the lepton+jets channel, pp[over-bar] -->tt[over-bar] +X+X-->ℓνbqq′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 600 GeV/c[superscript 2], the dark matter particle mass being anywhere below mT′. The data are consistent with standard model expectations, and we set 95% confidence level limits on the generic production of T′T[over-bar] ′-->tt[over-bar] +X+X. For the dark matter model we exclude T′ at 95% confidence level up to mT′=360 GeV/c[superscript 2] for mX[less than or equal to]100 GeV/c[superscript 2].
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.106.191801
