In the general 2HDM with unitarity, bounded-from-below, and T parameter constraints, the Higgs triple coupling ranges up to 1.6 times the SM value and can be negative, while the quartic coupling remains positive and reaches up to four times SM.
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Higgs masses and couplings in the general 2HDM with unitarity bounds
In the general 2HDM with unitarity, bounded-from-below, and T parameter constraints, the Higgs triple coupling ranges up to 1.6 times the SM value and can be negative, while the quartic coupling remains positive and reaches up to four times SM.