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Warped gravitons at the CERN LHC and beyond

Kaustubh Agashe1, Hooman Davoudiasl3, Gilad Perez2, and Amarjit Soni3

  • 1Department of Physics, Syracuse University, Syracuse, New York 13244, USA
  • 2C. N. Yang Institute for Theoretical Physics, State University of New York, Stony Brook, New York 11794-3840, USA
  • 3Brookhaven National Laboratory, Upton, New York 11973, USA

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Phys. Rev. D 76, 036006 – Published 31 August, 2007

DOI: https://doi.org/10.1103/PhysRevD.76.036006

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 300  fb−1 (SLHC with 3  ab−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 ∼4  TeV, as favored by the electroweak and flavor precision tests in the simplest such models.

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Phys. Rev. D 76, 036006– Published 31 August, 2007
  • Received 3 April 2007

© 2007 American Physical Society

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