Neutral $Z$ boson pair production due to radion resonance in the Randall-Sundrum model: prospects at the CERN LHC

Abstract

The Neutral $Z$ boson pair production due to radion resonance at the Large Hadron Collider (LHC) is an interesting process to explore the notion of warped geometry (Randall-Sundrum model). Because of the enhanced coupling of radion with a pair of gluons due to trace enomaly and top(quark) loop, the radion can provide larger event rate possibility as compared to any New Physics effect. Using the proper radion-top-antitop (with the quarks being off-shell) coupling, we obtain the correct radion production rate at LHC and explore several features of a heavier radion decaying into a pair of real $Z$ bosons which subsequently decays into charged $4l(l=e,\mu )$ leptons (the gold-plated mode). Using the signal and background event rate, we obtain bounds on radion mass $m_{\varphi }$ and radion vev $\text{vphi}$ at the $5\sigma$, $10\sigma$ discovery level.

Comments: 17 pages, 4 figures, minor changes in the text, result unchanged. Version to appear in Phys. Rev. D