Higgs-Radion Mixing with Enhanced Di-Photon Signal

TL;DR

This paper investigates Higgs-Radion mixing in warped extra-dimensional models, revealing that the Radion can have enhanced di-photon signals at the LHC due to suppressed couplings to massive particles, differing from previous models.

Contribution

It demonstrates that in warped scenarios with bulk SM fields, the Radion's phenomenology can significantly differ, especially in di-photon decay channels, compared to IR-localized models.

Findings

Radion decays into photons can be sizeable beyond ZZ and WW thresholds.

Phenomenology of the mostly-Higgs field remains similar to original models.

The mostly-Radion field shows important phenomenological differences.

Abstract

In the context of warped scenarios in which Standard Model (SM) fields are allowed to propagate in the bulk, we revisit the possible mixing between the IR localized Higgs field and the Radion graviscalar. The phenomenology of the resulting mostly-Higgs field does not suffer important deviations with respect to the case in which all the SM is localized in the IR brane (original Higgs-Radion mixing scenario). On the contrary, the phenomenology of the mostly-Radion field can present important differences with respect to the original scenario. At the LHC, the most striking effect is now the possibility of sizeable Radion decays into photons in a mass range well beyond the ZZ and WW thresholds, not due to dramatically enhanced couplings to photons but to suppressed couplings to massive fields.