  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 $4 l (l=e, \mu)$ leptons (the gold-plated
mode). Using the signal and background event rate, we obtain bounds on radion
mass $m_\phi$ and radion vev $\vphi$ at the $5\sigma$, $10\sigma$ discovery
level.
