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Search for heavy quarks decaying into a top quark and a W or Z boson using lepton + jets events in pp collisions at sā=7 TeV
Baringer, Philip S. Bean, Alice Benelli, Gabriele Kenny, R. P., III Murray, Michael J. Noonan, Danny Sanders, Stephen J. Stringer, Robert W. Tinti, Gemma Wood, Jeffrey Scott
Baringer, Philip S.
Bean, Alice
Benelli, Gabriele
Kenny, R. P., III
Murray, Michael J.
Noonan, Danny
Sanders, Stephen J.
Stringer, Robert W.
Tinti, Gemma
Wood, Jeffrey Scott
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Abstract
Results are presented from a search for the pair-production of heavy quarks, QQ-bar , that decay exclusively into a top quark and a W or Z boson. The search is performed using a sample of proton-proton collisions at sā=7 TeV corresponding to an integrated luminosity of 5.0 fb(ā1), collected by the Compact Muon Solenoid experiment. The signal region is defined using a sample of events containing one electron or muon, missing transverse momentum, and at least four jets with large transverse momenta, where one jet is likely to originate from the decay of a bottom quark. No significant excess of events is observed with respect to the standard model expectations. Assuming a strong pair-production mechanism, quark masses below 675 (625) GeV decaying into tW (tZ) are excluded at the 95 % confidence level.
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This is the publisher's version, also available electronically from http://link.springer.com/article/10.1007%2FJHEP01%282013%29154.
Date
2013-01-24
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Springer-Verlag
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S. Chatrchyan et al. (The CMS Collaboration). (2013). "Search for heavy quarks decaying into a top quark and a W or Z boson using lepton + jets events in pp collisions at sā=7 TeV." Journal of High Energy Physics, 01(2013):154. http://www.dx.doi.org/10.1007/JHEP01(2013)154.