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Loss of unitarity in an effective field theory is often cured by theappearance of dynamical resonances, revealing the presence of new degrees offreedom. These resonances may manifest themselves when suitable unitarizationtechniques are implemented in the effective theory, which in thescalar-isoscalar channel require making use of the coupled-channel formalism.Conversely, experimental detection of a resonance may provide interestinginformation on the couplings and constants of the relevant effective theory. Byapplying the systematical procedure developed in previous works, we willattempt to accommodate a possible scalar resonance with mass around $650$ GeVfor which there is preliminary evidence at the LHC in the vector boson fusionchannel. The results are interesting: the resonance can be accommodated withinthe experimentally allowed range of next-to-leading order coefficients in theHEFT but in a rather non-trivial manner. Interestingly, its width andproduction cross section turn out to agree with the tentative experimentalresults.

Accommodating the H$(650)$ in the HEFT