Kaluza-Klein Gluons as a Diagnostic of Warped Models

Abstract

We study the properties of $g^1$, the first excited state of the gluon in representative variants of the Randall Sundrum model with the Standard Model fields in the bulk. We find that measurements of the coupling to light quarks (from the inclusive cross-section for $pp\to g^1\to t\bar{t}$), the coupling to bottom quarks (from the rate of $pp\to g^{1}b$), as well as the overall width, can provide powerful discriminants between the models. In models with large brane kinetic terms, the $g^1$ resonance can even potentially be discovered decaying into dijets against the large QCD background. We also derive bounds based on existing Tevatron searches for resonant $t\bar{t}$ production and find that they require $M_{g^1}\gtrsim 950$ GeV. In addition we explore the pattern of interference between the $g^1$ signal and the non-resonant SM background, defining an asymmetry parameter for the invariant mass distribution. The interference probes the relative signs of the couplings of the $g^1$ to light quark pairs and to $t\bar{t}$, and thus provides an indication that the top is localized on the other side of the extra dimension from the light quarks, as is typical in the RS framework.

25 pages, 10 figures

References in corpus (1)

• Gauge-Higgs Unification and Radiative Electroweak Symmetry Breaking in Warped Extra Dimensions

Cited by in corpus (8)

• The Little Randall-Sundrum Model at the Large Hadron Collider
• Collider Phenomenology of Gauge-Higgs Unification Scenarios in Warped Extra Dimensions
• Dark Matter and Electroweak Symmetry Breaking in Models with Warped Extra Dimensions
• High p_T Top Quarks at the Large Hadron Collider
• Searching for t-bar t Resonances at the Large Hadron Collider
• Associated production of a Kaluza-Klein excitation of a gluon with a t t(bar) pair at the LHC
• Unitarity Bounds for New Physics from Axial Coupling at LHC
• Same-sign top pair production in an extra-dimension model of flavor at the CERN Large Hadron Collider