Figure 3: Observations of Efimov resonances in optically trapped gases of ultracold cesium. The panel on the left-hand side shows experimental results [24] on atomic three-body recombination, where a prominent triatomic Efimov resonance shows up for $a<0$; here loss is expressed in terms of a recombination length $\rho \propto L_3^{1/4}$ [22]. The filled circles represent measurements taken at $10\text{nK}$, while the other data have been taken between $200$ and $450\text{nK}$. The panel on the right-hand side displays the two-body loss rate coefficient $\beta$ measured for inelastic atom-dimer collisions [26] at two different temperatures, $40\text{nK}$ (open triangles) and $170\text{nK}$ (filled squares). Here a prominent atom-dimer Efimov resonance shows up for $a>0$. The solid lines represent fits based on universal effective-field theory [28, 27].