# Where is the “true” Higgs if the LHC 125 GeV signal is rather a higher dimensional radion than a SM Higgs?

In this article, Lumo introduces and explains the idea (presented by the original authors in this paper) that the LHC signal at about 125 GeV could alternatively be interpreted as a higher dimensional radion. Such a higher dimensional radion would better fit to the branching ratios observed at the LHC so far (at the present state of data accumulation) than a SM Higgs.

a) Where would the Higgs hide, if this model is true and the 125 GeV signal is rather a radion than a Higgs?

b) Would a Higgs still be needed in this case for Electroweak Symmetry Breaking (EWSB)?

or

c) Could the radion itself play the role of the Higgs?

"Acknowledgment": Lumo has started to think about these questions at the end of the article too, so we are both very curious about the answers to these issues.

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Since this question could still be open (again ...) and people who work on this are maybe found at theoretical physics SE, I thought about asking there too. But I'm not 100 % sure if they would like it ... –  Dilaton Apr 21 '12 at 14:07
The radion is a massless field, isn't it? So (c) can't be . –  DIMension10 Aug 14 at 12:42
@Dimension10 Lumo explained that it should some kind of describe the "thickness" of the Randall-Sundrum world, so is it not some kind of muduli field? Dont know how massive it is expected to be (if it should have any mass at all) out of my head ... –  Dilaton Aug 14 at 13:30

The LHC experiments have searched the entire allowed mass range for the standard model Higgs, from the lower limit set by LEP to the upper limit set by unitarity bounds, and everything except this region around $125\text{ GeV}$ is excluded at 95% confidence level. So if this bump turns out not to be the Higgs boson, the standard model Higgs is ruled out and we would have to start looking at rather more exotic model which predict Higgs masses in excess of $600\text{ GeV}$. I don't know of any particular model of this sort which has generated much interest among particle physicists.