Collider Tests of Compact Space Dimensions Using Weak Gauge Bosons

TL;DR

This paper investigates collider-based tests for large compact extra dimensions affecting weak gauge boson processes, using existing LEP-I data and predictions for future collider experiments to constrain the scale of new dimensions.

Contribution

It provides the first constraints on scalar gravitons from collider data and compares bounds from LEP-I, LEP-II, and Tevatron for models with large extra dimensions.

Findings

LEP-I data constrains the scale of extra dimensions via $Z$ decay modes.

Bounds from collider data are comparable to high-energy collider limits.

Predictions for $W(Z)+\G$ production at Tevatron and future colliders.

Abstract

We present collider tests of the recent proposal for weak-scale quantum gravity due to new large compact space dimensions in which only the graviton ($\G$) propagates. We show that the existing high precision LEP-I $Z$-pole data can impose non-trivial constraints on the scale of the new dimensions, via the decay mode $Z\to f\bar{f}+\G$ ($f=q,\ell$). These bounds are comparable to those obtained at high energy colliders and provide the first sensitive probe of the scalar graviton. We also study $W(Z)+\G$ production and the anomalous $WW(ZZ)$ signal from virtual $\G$-states at the Fermilab Tevatron, and compare them with the LEP-I bound and those from LEP-II and future linear colliders.