The reaction γ+p→K++Σ+π was used to determine the invariant mass distributions or “line shapes” of the Σ+π−, Σ−π+, and Σ0π0 final states, from threshold at 1328 MeV/c2 through the mass range of the Λ(1405) and the Λ(1520). The measurements were made with the CLAS system at Jefferson Lab using tagged real photons, for center-of-mass energies 1.95
Physical Review C
Moriya, K.; Biselli, Angela; and CLAS Collaboration, "Measurement of the Σπ photoproduction line shapes near the Λ (1405)" (2013). Physics Faculty Publications. 31.
Moriya, Kei, et al. "Measurement of the Σπ photoproduction line shapes near the Λ (1405)." Physical Review C 87.3 (2013): 035206. DOI: 10.1103/PhysRevC.87.035206