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In the vicinity of a narrow Feshbach resonances Efimov features are expectedto be characterized by the resonance's properties rather than the van der Waalslength of the interatomic potential. Although this theoretical prediction iswell-established by now, it still lacks experimental confirmation. Here, weapply our recently developed three-channel model [Yudkin and Khaykovich, Phys.Rev. A 103, 063303 (2021)] to the experimental result obtained in amass-imbalanced $^6$Li-$^{133}$Cs mixture in the vicinity of the narrowestresonance explored to date [Johansen at. al. Nat. Phys. 13, 731 (2017)]. Weconfirm that the observed position of the Efimov resonance is dictated mainlyby the resonance physics while the influence of the van der Waals tail of theinteratomic potential is minor. We show that the resonance position is stronglyinfluenced by the presence of another Feshbach resonance which significantlyalters the effective background scattering length at the narrow resonanceposition.

Efimov resonance position near a narrow Feshbach resonance in $^6$Li-$^{133}$Cs mixture