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Journal Articles Journal of High Energy Physics Year : 2014

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

S. Chatrchyan
  • Function : Author
P. Busson
R. Granier de Cassagnac
C. Mironov
P. Paganini
J.-L. Agram
C. Collard
E. Conte
P. van Hove
D. Contardo
M. Gouzevitch
M. Lethuillier
V. Sordini
P. Verdier
S. Viret

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.

Dates and versions

in2p3-00912494 , version 1 (02-12-2013)

Identifiers

Cite

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, 2014, 6, pp.125. ⟨10.1007/JHEP06(2014)125⟩. ⟨in2p3-00912494⟩
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