Abstract
We present a search for a new particle decaying to a top quark via , where goes undetected. We use a data sample corresponding to of integrated luminosity of collisions with , collected at Fermilab Tevatron by the CDF II detector. Our search for pair production of is focused on the hadronic decay channel, . We interpret our results in terms of a model where is an exotic fourth generation quark and is a dark matter particle. The data are consistent with standard model expectations. We set a limit on the generic production of , excluding the fourth generation exotic quarks at 95% confidence level up to for .
- Received 20 July 2011
DOI:https://doi.org/10.1103/PhysRevLett.107.191803
© 2011 American Physical Society