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A large class of models addressing the electroweak naturalness problempostulates the existence of new spontaneously broken global symmetries abovethe weak scale. The Higgs boson arises as a pseudo-Nambu-Goldstone boson (pNGB)whose interactions are nonlinear due to the presence of de- generate vacua. Weargue that, once the normalization of the pNGB decay constant f is determined,the Higgs nonlinear interactions in the gauge sector are universal in theinfrared and independent of the symmetry breaking pattern G/H, even afterintegrating out heavy composite resonances. We propose a set of "universalrelations" in Higgs couplings with electroweak gauge bosons and in triple gaugeboson couplings, which are unique predictions of the universal nonlinearity.Experimental measurements of these relations would serve as the litmus test ofa pNGB Higgs boson.

Universal Imprints of a Pseudo-Nambu-Goldstone Higgs Boson