Warped gravitons at the CERN LHC and beyond
Abstract
We study the production and decay of Kaluza-Klein (KK) gravitons at the CERN 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 qq¯ 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 subdominant production mode. In particular, the golden ZZ decay mode offers a distinctive 4-lepton signal that could lead to the observation at the LHC with 300fb-1 (SLHC with 3ab-1) of a KK graviton with a mass up to ∼2 (∼3) TeV for the ratio of the AdS5 curvature to the 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 SLHC luminosity are required to discover gravitons heavier than ∼4TeV, as favored by the electroweak and flavor precision tests in the simplest such models.
- Publication:
-
Physical Review D
- Pub Date:
- August 2007
- DOI:
- 10.1103/PhysRevD.76.036006
- arXiv:
- arXiv:hep-ph/0701186
- Bibcode:
- 2007PhRvD..76c6006A
- Keywords:
-
- 13.35.-r;
- 11.10.Kk;
- Decays of leptons;
- Field theories in dimensions other than four;
- High Energy Physics - Phenomenology
- E-Print:
- 9 pages, 5 figures. Minor modifications, reference added