The Little Randall-Sundrum Model at the Large Hadron Collider

TL;DR

The Little Randall-Sundrum model is a truncated warped extra-dimensional framework that predicts enhanced LHC signals and better suppression of unwanted effects compared to the original RS model, with calculable couplings and improved phenomenology.

Contribution

This paper introduces the Little Randall-Sundrum model, a truncated version of the RS scenario, with explicit calculability and improved experimental signatures.

Findings

Enhanced di-lepton signals at LHC by factor of about y^3

Suppressed electroweak and flavor constraints compared to RS

Explicit calculations of KK couplings without ad hoc assumptions

Abstract

We present a predictive warped model of flavor that is cut off at an ultraviolet scale O(10^3) TeV. This "Little Randall-Sundrum (LRS)" model is a volume-truncation, by a factor $y \approx 6$, of the RS scenario and is holographically dual to dynamics with number of colors larger by $y$. The LRS couplings between Kaluza-Klein states and the Standard Model fields, including the proton constituents, are explicitly calculable without ad hoc assumptions. Assuming separate gauge and flavor dynamics, a number of unwanted contributions to precision electroweak, $Z b\bar b$ and flavor observables are suppressed in the LRS framework, compared with the corresponding RS case. An important consequence of the LRS truncation, independent of precise details, is a significant enhancement of the clean (golden) di-lepton LHC signals, by O(y^3), due to a larger "$\rho$-photon" mixing and a smaller inter-composite coupling.