Big signals of Little Randall-Sundrum models

We examine signals at the Large Hadron Collider (LHC) of Kaluza-Klein modes, in volume-truncated Little Randall-Sundrum (LRS) models of flavor, characterized by 5D cutoff scales M-5 that are small compared to the 4D Planck mass M-P similar to 10(19) GeV. In particular, for the phenomenologically viable choice M-5 similar to 10(4) TeV, the discovery of a 2 (3)-TeV Little Z' at the LHC requires about 1 (4) fb(-1) at root s = 10 (14) TeV, in the clean di-lepton channel. Our results highlight the possibility of probing interesting values of M-5, starting with the early LHC data. With M-5 similar to 10(4) TeV, discovering the second KK mode Z '', at about 4.3 TeV, requires O(100) fb(-1) at root s = 14 TeV, providing a probe of the warped nature of the bulk that is encoded in the mass ratio of the first two KK modes, at design luminosity. By comparison, discovering a 3-TeV Z' of the Planck-weak hierarchy models (with M-5 similar to M-P), in any channel, would require upwards of O(300) fb(-1) at root s = 14 TeV. We also point out that discovery prospects markedly improve for Little KK gluons as well, but the challenging reconstruction of their a decay products may hamper their early discovery. (C) 2010 Elsevier B.V. All rights reserved.