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

Author(s)
Gomez-Ceballos, Guillelmo; Bauer, Gerry P
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Abstract
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].
Date issued
2011-11
URI
http://hdl.handle.net/1721.1/71194
Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaltonen, T. et al. “Search for New T^{′} Particles in Final States with Large Jet Multiplicities and Missing Transverse Energy in Pp[over ¯] Collisions at Sqrt[s]=1.96  TeV.” Physical Review Letters 107.19 (2011). © 2011 American Physical Society
Version: Final published version
ISSN
0031-9007
1079-7114

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