LHC Signals from Warped Extra Dimensions

Abstract

We study production of Kaluza-Klein gluons (KKG) at the Large Hadron Collider (LHC) in the framework of a warped extra dimension with the Standard Model (SM) fields propagating in the bulk. We show that the detection of 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 m_{KKG} \lesssim 4 TeV, 100 fb^{-1} of data at the LHC can provide discovery of the KK gluon. We utilize a sizeable 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.

11 pages and 6 figures

References in corpus (11)

• A custodial symmetry for Zbb
• Light Kaluza-Klein States in Randall-Sundrum Models with Custodial SU(2)
• Collider Signals of Top Quark Flavor Violation from a Warped Extra Dimension
• Implications of the measurement of the B^0_s-\bar B^0_s mass difference
• Electroweak effects in top-quark pair production at Hadron Colliders
• Probing the Randall-Sundrum geometric origin of flavor with lepton flavor violation
• Weak interaction corrections to hadronic top quark pair production
• Flavour physics of the RS model with KK masses reachable at LHC
• Lepton distribution as a probe of new physics in production and decay of the t quark and its polarization
• Probing Extra Dimensions with ATLAS
• Third order Coulomb correction to ttbar threshold cross section

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