CERN LHC signals from warped extra dimensions

Kaustubh Agashe, Alexander Belyaev, Tadas Krupovnickas, Gilad Perez, and Joseph Virzi
Phys. Rev. D 77, 015003 – Published 8 January 2008

Abstract

We study production of Kaluza-Klein (KK) gluons at the Large Hadron Collider (LHC) in the framework of a warped extra dimension with the standard model fields propagating in the bulk. We show that the detection of the KK gluon is challenging since its production is suppressed by small couplings to the proton’s constituents. Moreover, the KK gluon decays mostly to top pairs due to an enhanced coupling and hence is broad. Nevertheless, we demonstrate that for MKKG4TeV, 100fb1 of data at the LHC can provide discovery of the KK gluon. We utilize a sizable left-right polarization asymmetry from the KK gluon resonance to maximize the signal significance, and we explore the novel feature of extremely highly energetic “top-jets.” We briefly discuss how the detection of electroweak gauge KK states (Z/W) faces a similar challenge since their leptonic decays (golden modes) are suppressed. Our analysis suggests that other frameworks, for example, little Higgs, which rely on UV completion via strong dynamics might face similar challenges, namely, (1) suppressed production rates for the new particles (such as Z), due to their “light-fermion-phobic” nature, and (2) difficulties in detection since the new particles are broad and decay predominantly to third generation quarks and longitudinal gauge bosons.

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  • Received 10 June 2007

DOI:https://doi.org/10.1103/PhysRevD.77.015003

©2008 American Physical Society

Authors & Affiliations

Kaustubh Agashe1, Alexander Belyaev2, Tadas Krupovnickas3, Gilad Perez4, and Joseph Virzi5

  • 1Department of Physics, Syracuse University, Syracuse, New York 13244, USA
  • 2Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
  • 3Brookhaven National Laboratory, Upton, New York 11973, USA
  • 4C. N. Yang Institute for Theoretical Physics, State University of New York, Stony Brook, New York 11794-3840, USA
  • 5Lawrence Berkeley National Laboratory, Physics Division, 1 Cyclotron Road, Berkeley, California 94720, USA

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Issue

Vol. 77, Iss. 1 — 1 January 2008

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