small Q² (E-05-009) to extract the pole position in the complex-energy plane (primary signature of a resonance) for the ?(1520) with mass and width , which seem to be smaller than their Breit-Wigner values. This was the first determination of the pole position for a hyperon.

The lambda baryon has also been observed in atomic nuclei called hypernuclei. These nuclei contain the same number of protons and neutrons as a known nucleus, but also contains one