Direct bound on the minimal Universal Extra Dimension model from the $t\bar{t}$ resonance search at the Tevatron

Abstract

In the minimal Universal Extra Dimension (mUED) model, the second Kaluza-Klein (KK) gluon $g^{(2)}$ has loop-induced vertices with the standard model quarks, mediated by the first KK modes of the quark and the gluon/Higgs boson. With a top quark pair, this vertex is enhanced by the cooperation of the strong coupling of a gluon and the large Yukawa coupling of a top quark, leading to substantial branching ratio of $Br(g^{(2)}\to t\bar{t})\approx 7$. As the $g^{(2)}$ coupling with two gluons appears via dimension-6 operator, $q\bar{q}\to g^{(2)}\to t\bar{t}$ is the golden mode for the mUED model. Hence the best channel is the $t\bar{t}$ resonance search in $p\bar{p}$ collisions. The recent Tevatron data at $\sqrt{s}=1.96$ TeV with an integrated luminosity of 8.7 fb${}^{-1}$ are shown to give the first direct bound on the $g^{(2)}$ mass above 800 GeV. The implication and future prospect at the LHC are discussed also.

referenced minor corrections added; 13 pages with 4 figures

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Cited by in corpus (8)

• Current LHC Constraints on Minimal Universal Extra Dimensions
• Universal extra dimensions after Higgs discovery
• LHC Collider Phenomenology of Minimal Universal Extra Dimensions
• Kinematic Cusps with Two Missing Particles II: Cascade Decay Topology
• Dark Matter in Minimal Universal Extra Dimensions with a Stable Vacuum and the "Right" Higgs
• Hidden symmetries induced by a canonical transformation and gauge structure of compactified Yang-Mills theories
• Yang-Mills theories with an arbitrary number of compactified extra dimensions
• KK-number non-conserving decays: Signal of n = 2 excitations of Extra-Dimensional Models at the LHC