Search for New T' Particles in Final States with Large Jet Multiplicities and Missing Transverse Energy in pp̅ Collisions at √s=1.96 TeV

• Main Authors: Bauer, Gerry P. (Contributor), Gomez-Ceballos, Guillelmo (Contributor)
• Other Authors: Massachusetts Institute of Technology. Laboratory for Nuclear Science (Contributor)
• Format: Article
• Language: English
• Published: American Physical Society, 2012-06-21T17:26:45Z.
• Subjects: Article
• Online Access: Get fulltext

 We present a search for a new particle T' decaying to a top quark via T'→t+X, where X goes undetected. We use a data sample corresponding to 5.7  fb[superscript -1] of integrated luminosity of pp̅ collisions with √s=1.96  TeV, collected at Fermilab Tevatron by the CDF II detector. Our search for pair production of T' is focused on the hadronic decay channel, pp̅ →T'T̅ '→tt̅ +XX̅ →bqq̅ b̅ qq̅ +XX̅ . 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 T'T̅ '→tt̅ +XX̅ , excluding the fourth generation exotic quarks T' at 95% confidence level up to mT'=400  GeV/c[superscript 2] for mX≤70  GeV/c[superscript 2].