Search for Production of Heavy Particles Decaying to Top Quarks and Invisible Particles in pp[over-bar] Collisions at [sqrt]s=1.96 TeV
Author(s)Bauer, Gerry P.; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Makhoul, Khaldoun; Paus, Christoph M. E.
Search for Production of Heavy Particles Decaying to Top Quarks and Invisible Particles in pp̅ Collisions at √s=1.96 TeV
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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].
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Physical Review Letters
American Physical Society
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.
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