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

The CMS collaboration
JHEP 1406 (2014) 125, 2014

Abstract (data abstract)
CERN-LHC. A search is performed for pair-produced spin-3/2 excited top quarks ($t^*\bar{t}^*$), 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 $\sqrt{s}$=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.

  • Table 1

    Data from Figure 1a

    10.17182/hepdata.66136.v1/t1

    Kinematic distributions of single l + > 5-jet events in data (points), compared to MC simulation normalized to the number...

  • Table 2

    Data from Figure 1b

    10.17182/hepdata.66136.v1/t2

    Kinematic distributions of single l + > 5-jet events in data (points), compared to MC simulation normalized to the number...

  • Table 3

    Data from Figure 1c

    10.17182/hepdata.66136.v1/t3

    Kinematic distributions of single l + > 5-jet events in data (points), compared to MC simulation normalized to the number...

  • Table 4

    Data from Figure 1d

    10.17182/hepdata.66136.v1/t4

    Kinematic distributions of single l + > 5-jet events in data (points), compared to MC simulation normalized to the number...

  • Table 5

    Data from Figure 1e

    10.17182/hepdata.66136.v1/t5

    Kinematic distributions of single l + > 5-jet events in data (points), compared to MC simulation normalized to the number...

  • Table 6

    Data from Figure 1f

    10.17182/hepdata.66136.v1/t6

    Kinematic distributions of single l + > 5-jet events in data (points), compared to MC simulation normalized to the number...

  • Table 7

    Data from Figure 2a

    10.17182/hepdata.66136.v1/t7

    Reconstructed mass spectrum for the $tg$ system in data (points), along with a fit of the background $f(m)$ to the...

  • Table 8

    Data from Figure 2b

    10.17182/hepdata.66136.v1/t8

    Reconstructed mass spectrum for the $tg$ system in data (points), along with a fit of the background $f(m)$ to the...

  • Table 9

    Data from Figure 3

    10.17182/hepdata.66136.v1/t9

    The observed (solid line) and expected (dashed line) 95%CL upper limits for the product of the inclusive $t^{*}\bar{t}^{*}$ production cross...

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