Feynman diagram for non-resonant pair-production of Y, with subsequent decays to pairs of
gluons. | |

Feynman diagram for resonant pair-production via X of Y, with subsequent decays to pairs of
gluons. | |

Overall efficiency, including trigger and selection
requirements. Efficiency for several simulated
non-resonant YY→ jj jj samples with varying
m_{Y}. The shaded band shows the uncertainty. | |

Overall efficiency, including trigger and selection
requirements. Efficiency for several simulated
resonant X→ YY→ jj jj samples with varying
m_{Y}. Uncertainties, not shown, are similar to those in the
non-resonant case. | |

Reconstructed mean di-jet mass in events with four jets. Top
pane shows the events, with a parametric fit and several signal
hypotheses overlaid. Bottom pane shows the relative difference
between the observed data and the fit in each bin. | |

Reconstructed mean four-jet mass in events with four jets. Top
pane shows the events, with a parametric fit and several signal
hypotheses overlaid. Bottom pane shows the relative difference
between the observed data and the fit in each bin. | |

Upper limits at 95\% CL on
σ (p p̅→ YY → jjjj) versus m_{Y} in
the non-resonant analysis. Two signal hypotheses are shown, see text
for details. | |

Upper limits at 95\% CL on
σ (p p̅→ X→ YY → jjjj)
versus m_{X} and m_{Y}. Circles indicate the grid of simulated
samples where limits are evaluated; intervening values are interpolated. | |

Reconstructed average di-jet mass for several simulated
non-resonant YY→ jj jj samples with varying m_{Y}. | |

Reconstructed four-jet mass for several simulated
resonant X→ YY→ jj jj samples with varying
m_{X} for m_{Y}=50 GeV/c^{2}. | |

Upper limits at 95\% CL on
σ (p p̅→ YY → jjjj) versus m_{X} with
m_{Y}=50 GeV/c^{2} in the resonant analysis. An axi-gluon signal
hypothesis is shown, see text for details. | |

Observed and expected 95% CL upper limits on
σ(p p̅→ YY → jjjj)
for several values
of m_{Y}. Also shown are theoretical predictions for coloron pair
production or stop-quark pair production with
R-parity violating decay t ˜ → qq
| |

Observed and expected 95% CL upper limits on
σ(p p̅ → X→ YY → jjjj) for several values
of m_{Y} and m_{X}. Also shown are theoretical predictions for
axi-gluon production assuming coupling to quarks of C_{q}=0.4
| |