Warped Graviton"Z + Missing Energy"Signal at Hadron Colliders
We examine the reach at hadron colliders for the lightest warped Kaluza-Klein (KK) graviton G1 in the Z(→ ll)Z(→ νν̄) channel, l = e, μ, within Randall-Sundrummodels of hierarchy and flavor where the Standard Model gauge fields and fermions propagate in the 5D bulk. The reconstructed Z and the accompanying large missing energy allow for an efficient suppression of backgrounds. For reasonable parameters, a ∼ 2 (2.6) TeV G1 can be discovered at 5σ with 300 fb (3 ab) of 14 TeV LHC data via our “Z + missing energy” signal. Using this signal, the discovery reach for G1 at a future 100 TeV pp collider is estimated to be as high as ∼ 10 TeV. We discuss mass determination of the singly produced G1, using the energy distribution of its visible (Z → ll) decay product, by adapting a recently proposed method. Based on our analysis, a mass measurement at the ∼ 5% level with ∼ 3 ab of the 14 TeV LHC data can be feasible.