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

By CMS Collaboration, A. Adair, B. Akgun, K.M. Ecklund, F.J.M. Geurts, W. Li, B. Michlin, B.P. Padley, R. Redjimi, J. Roberts and J. Zabel

Abstract

A search is performed for pair-produced spin-3/2 excited top quarks (t∗t¯∗) , 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 √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 fb−1, 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

Topics: Hadron-Hadron Scattering, Top physics
Year: 2014
DOI identifier: 10.1007/JHEP06(2014)125
OAI identifier: oai:scholarship.rice.edu:1911/79498
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