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Search for pair production of excited top quarks in the lepton+jets final state

Abstract : A search is performed for pair-produced spin-3/2 excited top quarks (t* t*-bar), each decaying to a top quark and a gluon. The search uses data collected with the CMS detector from pp collisions at a center-of-mass energy of sqrt(s)=8 TeV, selecting events that have a single isolated muon or electron, an imbalance in transverse momentum, and at least six jets, of which one must be compatible with originating from the fragmentation of a b quark. The data, corresponding to an integrated luminosity of 19.5 inverse femtobarns, show no significant excess over standard model predictions, and provide a lower limit of 803 GeV at 95% confidence on the mass of the spin-3/2 t* quark in an extension of the Randall-Sundrum model, assuming a 100% branching fraction of its decay into a top quark and a gluon. This is the first search for a spin-3/2 excited top quark performed at the LHC.
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http://hal.in2p3.fr/in2p3-00912494
Contributor : Dominique Girod <>
Submitted on : Monday, December 2, 2013 - 11:14:53 AM
Last modification on : Wednesday, November 25, 2020 - 4:10:43 PM

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S. Chatrchyan, M. Besancon, F. Couderc, M. Dejardin, D. Denegri, et al.. Search for pair production of excited top quarks in the lepton+jets final state. Journal of High Energy Physics, Springer, 2014, 6, pp.125. ⟨10.1007/JHEP06(2014)125⟩. ⟨in2p3-00912494⟩

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