Abstract
An important general prediction of stabilized brane world models is the existence of a bulk scalar radion field, whose lowest Kaluza-Klein (KK) mode is the scalar particle called the radion. This field comes from the fluctuations of the metric in the extra dimension and the radion mass can be smaller than that of all the massive KK modes of the other particles propagating in the multidimensional bulk. Due to its origin, the radion and its KK tower couple to the trace of the energy-momentum tensor of the Standard Model. These fields have the same quantum numbers as the neutral Higgs field and can mix with the latter, if they are coupled. We present a short review of some aspects of Higgs-radion phenomenology in stabilized brane-world models. In particular, we discuss the possibility of explaining the 750 GeV excess by the production of a radion-dominated state.
Highlights
Introduction to the modelThe discovery of the 125 GeV scalar boson [1], rather accurate measurements of its mass [2], still not very precise but compatible with the Standard Model (SM) expectations for the Higgs boson measurements of its properties, and the recent observation by the ATLAS and CMS experiments of the 750 GeV diphoton excess [4] attracted much attention to the scalar states predicted by various extensions of the SM
Taking into account the contributions of the excited KK states of the bulk fields is a complicated problem that needs a special thorough investigation. In this short review we have presented the results of a systematic study of the radion in stabilized brane-world models
Despite the differences in the Higgs boson and radion couplings to off-shell fermions, there is a Higgs boson-radion similarity in the processes involving off-shell fermions and an arbitrary number of gauge bosons that is present at the tree and loop levels
Summary
The discovery of the 125 GeV scalar boson [1], rather accurate measurements of its mass [2], still not very precise but compatible with the Standard Model (SM) expectations for the Higgs boson measurements of its properties (see [3]), and the recent observation by the ATLAS and CMS experiments of the 750 GeV diphoton excess [4] attracted much attention to the scalar states predicted by various extensions of the SM One of such SM extensions that naturally gives rise to extra scalar fields is the Randall-Sundrum model with two branes stabilized by a bulk scalar field [5, 6], which is necessary for the model to be phenomenologically acceptable. We discuss the possibility of explaining the 750 GeV excess by the production of a radion-dominated state
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