We investigate a Randall-Sundrum (RS) model with an SU(2) doublet propagating in the bulk. Upon calculating its gravitational effect we find that a stabilized radius can be generated without the use of an additional scalar, as needed for example in the Goldberger-Wise (GW) mechanism, and with no additional fine-tuning other than the inescapable one due to the cosmological constant; similar tuning is also present in the GW mechanism. The lowest scalar excitation in this scenario, the counterpart of the radion of the GW mechanism, has both radionlike and Higgs-like couplings to the Standard Model fields. It, thus, plays a dual role and we, therefore, denote it as the "Higgs radion" (hr). As opposed to the GW radion case, our Higgs radion is found to be compatible with the 126 GeV scalar recently discovered at the LHC, at the level of 1σ, with a resulting 95% C.L. bound on the KK-gluon mass of 4.48TeV<MKKG<5.44TeV. An important consequence of our setup should be accentuated: the radion of the traditional RS scenarios simply does not exist, so that our Higgs radion is not the conventional mixed state between the GW radion and the Higgs.
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|State||Published - 13 May 2014|