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• W2902023212 abstract "The role of an intrinsic four-body scale in universal few-boson systems is the subject of active debate. We study these systems within the framework of effective field theory. For systems of up to six bosons we establish that no four-body scale appears at leading order (LO). However, we find that at next-to-leading (NLO) order a four-body force is needed to obtain renormalized results for binding energies. With the associated parameter fixed to the binding energy of the four-boson system, this force is shown to renormalize the five- and six-body systems as well. We present an original ansatz for the short-distance limit of the bosonic $A$-body wave function from which we conjecture that new $A$-body scales appear at N$^{A-3}$LO. As a specific example, calculations are presented for clusters of helium atoms. Our results apply more generally to other few-body systems governed by a large scattering length, such as light nuclei and halo states, the low-energy properties of which are independent of the detailed internal structure of the constituents." @default.
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• W2902023212 date "2019-04-10" @default.
• W2902023212 modified "2023-10-17" @default.
• W2902023212 title "Four-Body Scale in Universal Few-Boson Systems" @default.
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• W2902023212 doi "https://doi.org/10.1103/physrevlett.122.143001" @default.
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• W2902023212 hasPublicationYear "2019" @default.
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