Abstract
Recently (arXiv:1608.00526), a new framework for warped higher-dimensional compactifications with “bulk” standard model (SM) was proposed: in addition to the UV (Planck scale) and IR (a couple of TeV) branes, there is an intermediate brane, taken to be around 10TeV. The SM matter and Higgs fields propagate from the UV brane down to this intermediate brane only, while gauge and gravity fields propagate in the entire bulk. Such a configuration renders the lightest gauge Kaluza-Klein (KK) states within LHC reach, simultaneously satisfying flavor and CP constraints. In addition, the usual leading decay modes of the lightest KK gauge bosons into top and Higgs bosons are suppressed. This effect permits erstwhile subdominant channels to become significant. These include flavor-universal decays to SM fermions and Higgs bosons, and a novel channel — decay to a radion and a SM gauge boson, followed by radion decay to a pair of SM gauge bosons. In this work, we first delineate the parameter space where the above mentioned cascade decay of gauge KK particles dominates, and thereby can be the discovery mode at the LHC. We then perform a detailed analysis of the LHC signals from this model, finding that 300/fb suffices for evidence of KK-gluon in tri-jet, jet + di-photon and jet + di-boson channels. However, KK photon in photon + di-jet, and KK-W in leptonic W + di-jet require 3000/fb. The crucial feature of this decay chain is a “double” resonance, i.e. 3-particle and 2-particle invariant mass peaks, corresponding to the KK gauge boson and the radion respectively.
Highlights
We focus on the production and dominant decay channels of the lightest KK particles corresponding to the standard model (SM) gauge bosons, employing the representative benchmark points presented in table 3
As the other decay modes do not have a large enough rate, we focus on the photon + dijet channel via two benchmark points γ-γgg-BP1 and γ-γgg-BP2, defined in table 3
The standard warped extra dimensional model, with the entire SM arising as modes of fields propagating in the bulk between the UV and the IR branes, provides solutions to both the Planck-weak and flavor hierarchy problems of the SM
Summary
We review a natural extension of the “standard” Randall-Sundrum framework introduced in ref. [1]. We move our focus onto the mass spectrum of relevant particles and their interactions in detail, providing the corresponding explicit formulae
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