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for the potential: $V=\lambda_h(h^2-v^2)^2+\lambda_s(s^2-w^2)^2+\lambda_{hs}h^2s^2$, where h and s are two real scalar fields and v and w are the vacuum expectation values of the two fields. The problem is there is an interaction term in the potenvial. So how to valculate the effective potential at 1 loop? for this is the sum of the connected diagrams.

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