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We study the four-nucleon force contribution to the binding energy of 4He in the framework of chiral nuclear interactions. The  four-nucleon forces start to contribute in the next-to-next-to-next-to leading  order. We discuss our power counting expectations for the size of the 4N  contribution and then explicitly calculate it in rst order perturbation theory.  Our expectations agree with the results. Quantitatively, the contribution might  be signicant. This motivates further studies in more complex nuclei

Four-nucleon force contribution to the binding energy of4He

Four-nucleon force contribution to the binding energy of⁴He