Search for New T Particles in Final States with Large Jet Multiplicities and Missing Transverse Energy in pp¯ Collisions at s=1.96TeV

T. Aaltonen et al. (CDF Collaboration)
Phys. Rev. Lett. 107, 191803 – Published 1 November 2011

Abstract

We present a search for a new particle T decaying to a top quark via Tt+X, where X goes undetected. We use a data sample corresponding to 5.7fb1 of integrated luminosity of pp¯ collisions with s=1.96TeV, collected at Fermilab Tevatron by the CDF II detector. Our search for pair production of T is focused on the hadronic decay channel, pp¯TT¯tt¯+XX¯bqq¯b¯qq¯+XX¯. We interpret our results in terms of a model where T is an exotic fourth generation quark and X is a dark matter particle. The data are consistent with standard model expectations. We set a limit on the generic production of TT¯tt¯+XX¯, excluding the fourth generation exotic quarks T at 95% confidence level up to mT=400GeV/c2 for mX70GeV/c2.

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  • Received 20 July 2011

DOI:https://doi.org/10.1103/PhysRevLett.107.191803

© 2011 American Physical Society

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Vol. 107, Iss. 19 — 4 November 2011

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