Abstract
We study the properties of g{sup 1}, the first excited state of the gluon in representative variants of the Randall-Sundrum (RS) model with the standard model (SM) fields in the bulk. We find that measurements of the coupling to light quarks (from the inclusive cross section for pp-->g{sup 1}-->t[overline t]), the coupling to bottom quarks (from the rate of pp-->g{sup 1}b), as well as the overall width can provide powerful discriminants between the models. In models with large brane kinetic terms, the g{sup 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[overline t] production and find that they require M{sub g{sup 1}} > {approx} 950 GeV. In addition, we explore the pattern of interference between the g{sup 1} signal and the nonresonant SM background, defining an asymmetry parameter for the invariant mass distribution. The interference probes the relative signs of the couplings of the g{sup 1} to light quark pairs and to t[overline 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 RSmore » framework.« less
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