ρ parameter constraints on radion phenomenology and a lower bound on Higgs mass

In this Letter we determine the contribution of a light stabilized radion to the weak isospin violating ρ parameter by using an ultraviolet momentum cut off as the regulator. The LEPI bound on ρnew is then used to derive constraints on the radion mass mφ and its vev 〈φ〉. Finally by using the beta function of the Higgs self coupling we have determined a lower bound on the Higgs mass from the rho parameter constraints on mφ and 〈φ〉. Our results show that for mφ< 600 GeV the rho parameter bound on mh is stronger than the present direct bound from LEPII.