Flavor universal resonances and warped gravity

Abstract

Warped higher-dimensional compactifications with "bulk" standard model, or their AdS/CFT dual as the purely 4D scenario of Higgs compositeness and partial compositeness, offer an elegant approach to resolving the electroweak hierarchy problem as well as the origins of flavor structure. However, low-energy electroweak/flavor/CP constraints and the absence of non-standard physics at LHC Run 1 suggest that a "little hierarchy problem" remains, and that the new physics underlying naturalness may lie out of LHC reach. Assuming this to be the case, we show that there is a simple and natural extension of the minimal warped model in the Randall-Sundrum framework, in which matter, gauge and gravitational fields propagate modestly different degrees into the IR of the warped dimension, resulting in rich and striking consequences for the LHC (and beyond). The LHC-accessible part of the new physics is AdS/CFT dual to the mechanism of "vectorlike confinement", with TeV-scale Kaluza-Klein excitations of the gauge and gravitational fields dual to spin-0,1,2 composites. Unlike the minimal warped model, these low-lying excitations have predominantly flavor-blind and flavor/CP-safe interactions with the standard model. Remarkably, this scenario also predicts small deviations from flavor-blindness originating from virtual effects of Higgs/top compositeness at ∼ O(10) TeV, with subdominant resonance decays into Higgs/top-rich final states, giving the LHC an early "preview" of the nature of the resolution of the hierarchy problem. Discoveries of this type at LHC Run 2 would thereby anticipate (and set a target for) even more explicit explorations of Higgs compositeness at a 100 TeV collider, or for next-generation flavor tests.

Uncovering latent jet substructure

“…As a second example, we consider a NP model [63,64] containing a heavy W boson plus a heavy scalar φ. Signal events thus consist of resonant W production (at m W = 3 TeV), followed by W → W φ decays (where we choose m φ = 400 GeV m W such that both the W and the φ coming from W decays are boosted).…”

Detecting a boosted diboson resonance

“…We remark that in the standard warped setup consisting of a single region of bulk bounded by two branes, the rate for this entire process is rather small. On the contrary, what makes it large here is the presence of an extra region of bulk beyond the usual case (see [5] for more details).…”

“…In this paper, we study dedicated strategies for identifying such a light scalar decaying into merged W/Z pairs, dubbed a "boosted diboson" resonance. As a specific application of this general strategy, we consider an extension of the standard warped extra dimensional setup [5], where such a study is applicable. In this model, the role of ϕ is played by the radion (the modulus corresponding to fluctuations in extra dimensional size), with its parent being the Kaluza-Klein (KK) excitation of a SM EW gauge boson, and accompanying SM particle being an EW gauge boson (see Fig.…”

LHC signals for singlet neutrinos from a natural warped seesaw mechanism. II

“…The elementary hypercharge mixes with a combination of composite (B − L) and W 3 R as before, 13 but the crucial point is that these two composites are not degenerate anymore. The two heavy mass eigenstates resulting from this procedure thus contain mostly composite (B − L) and W 3 R , respectively, with small admixture of elementary hypercharge, followed by even smaller bit of the other composite.…”

“…Another possibility for such modifications of properties of gauge KK is to assume that the various gauge fields propagate in different bulk regions [13]. 12 For a discussion of fermion BKT's in general, see Ref.…”