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Physical Review D

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Kaluza-Klein gluons as a diagnostic of warped models

Ben Lillie^1,2, Jing Shu^1,2,3, and Tim M. P. Tait²

¹Enrico Fermi Institute and Department of Physics, University of Chicago, Chicago, Illinois 60637, USA
²HEP Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
³Kavli Institute for Cosmological Physics, University of Chicago, Chicago, Illinois 60637, USA

Phys. Rev. D 76, 115016 – Published 27 December, 2007

DOI: https://doi.org/10.1103/PhysRevD.76.115016

Abstract

We study the properties of $g^{1}$ , 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 $p p \to g^{1} \to t \bar{t}$ ), the coupling to bottom quarks (from the rate of $p p \to g^{1} b$ ), 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 $M_{g^{1}} ≳ 950 GeV$ . In addition, we explore the pattern of interference between the $g^{1}$ 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 $g^{1}$ 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.

Article Text

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