On the possibility of light string resonances at the LHC and Tevatron from Randall-Sundrum throats

TL;DR

This paper explores the potential for detecting light spin-3/2 top quark excitations predicted by string-inspired Randall-Sundrum models at the LHC and Tevatron, considering their production, properties, and current experimental constraints.

Contribution

It identifies the lightest string excitation as a spin-3/2 top quark partner and analyzes its possible observability in collider experiments.

Findings

The spin-3/2 top excitation can be as light as or lighter than Kaluza-Klein modes.

Current experimental limits are weaker due to an excess of WWjj events at Tevatron.

The resonance could be detectable with future collider data.

Abstract

In string realizations of the Randall-Sundrum scenario, the higher-spin Regge excitations of Standard Model states localized near the IR brane are warped down to close to the TeV scale. We argue that, as a consequence of the localization properties of Randall-Sundrum models of flavour, the lightest such resonance is the spin-3/2 excitation of the right-handed top quark over a significant region of parameter space. A mild accidental cancellation allows this resonance to be as light or lighter than the Kaluza-Klein excitations of the Standard Model states. We consider from a bottom-up effective theory point of view the production and possible observability of such a spin-3/2 excitation at the LHC and Tevatron. Current limits are weaker than might be expected because of the excess of WWjj events at the Tevatron reported by CDF for an invariant mass of 400-500 GeV.