Speaker
Dr
Hooman Davoudiasl
(Brookhaven National Laboratory)
Description
We study the production and decay of Kaluza-Klein (KK) gravitons at
the Large Hadron Collider (LHC), in the framework of a warped extra
dimension in which the Standard Model (SM) fields propagate. Such a
scenario can provide solutions to both the Planck-weak hierarchy
problem and the flavor puzzle of the SM.
In this scenario, the
production via $q \bar{q}$ annihilation and decays to the conventional
photon and lepton channels are
highly suppressed. However, we
show that graviton production via gluon fusion
followed by decay to longitudinal $Z/W$ can be significant; vector boson
fusion is found to be a sub-dominant production mode.
In particular, the ``golden'' $ZZ$ decay mode offers a distinctive
4-lepton signal that could lead to the observation at the LHC of a
KK graviton with a mass up to $\sim 2$ TeV
for the ratio of the AdS$_5$ curvature to Planck scale
modestly above unity. We argue that (contrary to the lore)
such a size of the curvature scale
can still be within the regime of validity of the framework.
Upgrades beyond the LHC design
are required to discover gravitons
heavier than $\sim 4$ TeV, as favored by the electroweak
and flavor precision tests.
Author
Dr
Hooman Davoudiasl
(Brookhaven National Laboratory)
