Scalar Production in Association with a Z Boson at LHC and ILC: the Mixed Higgs-Radion Case of Warped Models

Abstract

The radion scalar field might be the lightest new particle predicted by extra-dimensional extensions of the Standard Model. It could thus lead to the first signatures of new physics at the LHC collider. We perform a complete study of the radion production in association with the Z gauge boson in the custodially protected warped model with a brane-localised Higgs boson addressing the gauge hierarchy problem. Radion-Higgs mixing effects are present. Such a radion production receives possibly resonant contributions from the Kaluza-Klein excitations of the Z boson as well as the extra neutral gauge boson (Z'). All the exchange and mixing effects induced by those heavy bosons are taken into account in the radion coupling and rate calculations. The investigation of the considered radion production at LHC allows to be sensitive to some parts of the parameter space but only the ILC program at high luminosity would cover most of the theoretically allowed parameter space via the studied reaction. Complementary tests of the same theoretical parameters can be realised through the high accuracy measurements of the Higgs couplings at ILC. The generic sensitivity limits on the rates discussed for the LHC and ILC potential reach can be applied to the searches for other (light) exotic scalar bosons.

28 pages, 10 figures

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Cited by in corpus (8)

• A rapid holographic phase transition with brane-localized curvature
• Search for a light radion at HL-LHC and ILC250
• Forward-backward asymmetry in the gauge-Higgs unification at the International Linear Collider
• Higgs boson $ZZ$ couplings in Higgs-strahlung at the ILC
• Kinetic mixing between a Higgs and a nearly degenerate Dark scalar: oscillations and displaced vertices
• Photoproduction of mixed radions at a proton-proton collider
• Rigorous treatment of the ${\mathcal{S}}^1/{\mathbb{Z}}_2$ orbifold model with brane-Higgs couplings
• The radiatively corrected Kaluza-Klein masses in aether compactification