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We consider the associated production of a scalar resonance with the standardmodel Higgs boson. We demonstrate via a realistic phenomenological analysisthat couplings of such a resonance to the Higgs boson can be constrained in ameaningful way in future runs of the LHC, providing insights on its origin andits relation to the electroweak symmetry breaking sector. Moreover, the finalstate can provide a direct way to determine whether the new resonance isproduced predominantly in gluon fusion or quark-anti-quark annihilation. Theanalysis focusses on a resonance coming from a scalar field with vanishingvacuum expectation value and its decay to a photon pair. It can however bestraightforwardly generalised to other scenarios.

Uncovering the relation of a scalar resonance to the Higgs boson