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Title: Is a separate four-body parameter needed for Efimov-linked tetramers?
Plain: Four atoms can also bind into states attached to each Efimov molecule. The question is whether their positions follow from the three-atom number alone, or need extra information.
Precise: Zero-range theory predicts tetramer loss resonances at a_4,1 ~ 0.43 a_- and a_4,2 ~ 0.90 a_- (von Stecher, D'Incao, Greene 2009). With realistic van der Waals interactions, determine whether these ratios are universal to 5% or depend on short-range four-body physics. Answer: yes or no with a computed and measured spread across species.
Settled by: Precision four-body loss spectroscopy in several species with a matching van der Waals four-body calculation.
Kind: well-posed
Answer type: yes-no
References: (empty)
Literature status: partially-resolved
Status note: Cesium experiments since 2009 roughly match the zero-range ratios, but precision tests across species are missing.
Posed since: 2009